| Commit message (Collapse) | Author | Age | Files | Lines |
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Note: This change only applies to 32bit architectures. On 64bit
architectures the macros are NOPs.
__ulseq_to_u64seq() computes the upper 32 bits of the passed
argument value (@ulseq). The upper bits are derived from a base
value (@rb_next_seq) in a way that assumes @ulseq represents a
64bit number that is less than or equal to @rb_next_seq.
Until now this mapping has been correct for all call sites. However,
in a follow-up commit, values of @ulseq will be passed in that are
higher than the base value. This requires a change to how the 32bit
value is mapped to a 64bit sequence number.
Rather than mapping @ulseq such that the base value is the end of a
32bit block, map @ulseq such that the base value is in the middle of
a 32bit block. This allows supporting 31 bits before and after the
base value, which is deemed acceptable for the console sequence
number during runtime.
Here is an example to illustrate the previous and new mappings.
For a base value (@rb_next_seq) of 2 2000 0000...
Before this change the range of possible return values was:
1 2000 0001 to 2 2000 0000
__ulseq_to_u64seq(1fff ffff) => 2 1fff ffff
__ulseq_to_u64seq(2000 0000) => 2 2000 0000
__ulseq_to_u64seq(2000 0001) => 1 2000 0001
__ulseq_to_u64seq(9fff ffff) => 1 9fff ffff
__ulseq_to_u64seq(a000 0000) => 1 a000 0000
__ulseq_to_u64seq(a000 0001) => 1 a000 0001
After this change the range of possible return values are:
1 a000 0001 to 2 a000 0000
__ulseq_to_u64seq(1fff ffff) => 2 1fff ffff
__ulseq_to_u64seq(2000 0000) => 2 2000 0000
__ulseq_to_u64seq(2000 0001) => 2 2000 0001
__ulseq_to_u64seq(9fff ffff) => 2 9fff ffff
__ulseq_to_u64seq(a000 0000) => 2 a000 0000
__ulseq_to_u64seq(a000 0001) => 1 a000 0001
[ john.ogness: Rewrite commit message. ]
Reported-by: Francesco Dolcini <francesco@dolcini.it>
Reported-by: kernel test robot <oliver.sang@intel.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240207134103.1357162-3-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
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The macros __seq_to_nbcon_seq() and __nbcon_seq_to_seq() are
used to provide support for atomic handling of sequence numbers
on 32bit systems. Until now this was only used by nbcon.c,
which is why they were located in nbcon.c and include nbcon in
the name.
In a follow-up commit this functionality is also needed by
printk_ringbuffer. Rather than duplicating the functionality,
relocate the macros to printk_ringbuffer.h.
Also, since the macros will be no longer nbcon-specific, rename
them to __u64seq_to_ulseq() and __ulseq_to_u64seq().
This does not result in any functional change.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20240207134103.1357162-2-john.ogness@linutronix.de
Signed-off-by: Petr Mladek <pmladek@suse.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
Pull printk updates from Petr Mladek:
- Another preparation step for introducing printk kthreads. The main
piece is a per-console lock with several features:
- Support three priorities: normal, emergency, and panic. They will
be defined by a context where the lock is taken. A context with a
higher priority is allowed to take over the lock from a context
with a lower one.
The plan is to use the emergency context for Oops and WARN()
messages, and also by watchdogs.
The panic() context will be used on panic CPU.
- The owner might enter/exit regions where it is not safe to take
over the lock. It allows the take over the lock a safe way in the
middle of a message.
For example, serial drivers emit characters one by one. And the
serial port is in a safe state in between.
Only the final console_flush_in_panic() will be allowed to take
over the lock even in the unsafe state (last chance, pray, and
hope).
- A higher priority context might busy wait with a timeout. The
current owner is informed about the waiter and releases the lock
on exit from the unsafe state.
- The new lock is safe even in atomic contexts, including NMI.
Another change is a safe manipulation of per-console sequence number
counter under the new lock.
- simple_strntoull() micro-optimization
- Reduce pr_flush() pooling time.
- Calm down false warning about possible buffer invalid access to
console buffers when CONFIG_PRINTK is disabled.
[ .. and Thomas Gleixner wants to point out that while several of the
commits are attributed to him, he only authored the early versions of
said commits, and that John Ogness and Petr Mladek have been the ones
who sorted out the details and really should be those who get the
credit - Linus ]
* tag 'printk-for-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
vsprintf: uninline simple_strntoull(), reorder arguments
printk: printk: Remove unnecessary statements＇len = 0;＇
printk: Reduce pr_flush() pooling time
printk: fix illegal pbufs access for !CONFIG_PRINTK
printk: nbcon: Allow drivers to mark unsafe regions and check state
printk: nbcon: Add emit function and callback function for atomic printing
printk: nbcon: Add sequence handling
printk: nbcon: Add ownership state functions
printk: nbcon: Add buffer management
printk: Make static printk buffers available to nbcon
printk: nbcon: Add acquire/release logic
printk: Add non-BKL (nbcon) console basic infrastructure
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When CONFIG_PRINTK is not set, PRINTK_MESSAGE_MAX is 0. This
leads to a zero-sized array @outbuf in @printk_shared_pbufs. In
console_flush_all() a pointer to the first element of the array
is assigned with:
char *outbuf = &printk_shared_pbufs.outbuf[0];
For !CONFIG_PRINTK this leads to a compiler warning:
warning: array subscript 0 is outside array bounds of
'char[0]' [-Warray-bounds]
This is not really dangerous because printk_get_next_message()
always returns false for !CONFIG_PRINTK, which leads to @outbuf
never being used. However, it makes no sense to even compile
these functions for !CONFIG_PRINTK.
Extend the existing '#ifdef CONFIG_PRINTK' block to contain
the formatting and emitting functions since these have no
purpose in !CONFIG_PRINTK. This also allows removing several
more !CONFIG_PRINTK dummies as well as moving
@suppress_panic_printk into a CONFIG_PRINTK block.
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202309201724.M9BMAQIh-lkp@intel.com/
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230920155238.670439-1-john.ogness@linutronix.de
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For the write_atomic callback, the console driver may have unsafe
regions that need to be appropriately marked. Provide functions
that accept the nbcon_write_context struct to allow for the driver
to enter and exit unsafe regions.
Also provide a function for drivers to check if they are still the
owner of the console.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-9-john.ogness@linutronix.de
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Implement an emit function for nbcon consoles to output printk
messages. It utilizes the lockless printk_get_next_message() and
console_prepend_dropped() functions to retrieve/build the output
message. The emit function includes the required safety points to
check for handover/takeover and calls a new write_atomic callback
of the console driver to output the message. It also includes
proper handling for updating the nbcon console sequence number.
A new nbcon_write_context struct is introduced. This is provided
to the write_atomic callback and includes only the information
necessary for performing atomic writes.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-8-john.ogness@linutronix.de
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Add an atomic_long_t field @nbcon_seq to the console struct to
store the sequence number for nbcon consoles. For nbcon consoles
this will be used instead of the non-atomic @seq field. The new
field allows for safe atomic sequence number updates without
requiring any locking.
On 64bit systems the new field stores the full sequence number.
On 32bit systems the new field stores the lower 32 bits of the
sequence number, which are expanded to 64bit as needed by
folding the values based on the sequence numbers available in
the ringbuffer.
For 32bit systems, having a 32bit representation in the console
is sufficient. If a console ever gets more than 2^31 records
behind the ringbuffer then this is the least of the problems.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-7-john.ogness@linutronix.de
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Provide functions that are related to the safe handover mechanism
and allow console drivers to dynamically specify unsafe regions:
- nbcon_context_can_proceed()
Invoked by a console owner to check whether a handover request
is pending or whether the console has been taken over by another
context. If a handover request is pending, this function will
also perform the handover, thus cancelling its own ownership.
- nbcon_context_enter_unsafe()/nbcon_context_exit_unsafe()
Invoked by a console owner to denote that the driver is about
to enter or leave a critical region where a take over is unsafe.
The exit variant is the point where the current owner releases
the lock for a higher priority context which asked for the
friendly handover.
The unsafe state is stored in the console state and allows a
new context to make informed decisions whether to attempt a
takeover of such a console. The unsafe state is also available
to the driver so that it can make informed decisions about the
required actions and possibly take a special emergency path.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-6-john.ogness@linutronix.de
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In case of hostile takeovers it must be ensured that the previous
owner cannot scribble over the output buffer of the emergency/panic
context. This is achieved by:
- Adding a global output buffer instance for the panic context.
This is the only situation where hostile takeovers can occur and
there is always at most 1 panic context.
- Allocating an output buffer per non-boot console upon console
registration. This buffer is used by the console owner when not
in panic context. (For boot consoles, the existing shared global
legacy output buffer is used instead. Boot console printing will
be synchronized with legacy console printing.)
- Choosing the appropriate buffer is handled in the acquire/release
functions.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-5-john.ogness@linutronix.de
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The nbcon boot consoles also need printk buffers that are available
very early. Since the nbcon boot consoles will also be serialized
by the console_lock, they can use the same static printk buffers
that the legacy consoles are using.
Make the legacy static printk buffers available outside of printk.c
so they can be used by nbcon.c.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-4-john.ogness@linutronix.de
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Add per console acquire/release functionality.
The state of the console is maintained in the "nbcon_state" atomic
variable.
The console is locked when:
- The 'prio' field contains the priority of the context that owns the
console. Only higher priority contexts are allowed to take over the
lock. A value of 0 (NBCON_PRIO_NONE) means the console is not locked.
- The 'cpu' field denotes on which CPU the console is locked. It is used
to prevent busy waiting on the same CPU. Also it informs the lock owner
that it has lost the lock in a more complex scenario when the lock was
taken over by a higher priority context, released, and taken on another
CPU with the same priority as the interrupted owner.
The acquire mechanism uses a few more fields:
- The 'req_prio' field is used by the handover approach to make the
current owner aware that there is a context with a higher priority
waiting for the friendly handover.
- The 'unsafe' field allows to take over the console in a safe way in the
middle of emitting a message. The field is set only when accessing some
shared resources or when the console device is manipulated. It can be
cleared, for example, after emitting one character when the console
device is in a consistent state.
- The 'unsafe_takeover' field is set when a hostile takeover took the
console in an unsafe state. The console will stay in the unsafe state
until re-initialized.
The acquire mechanism uses three approaches:
1) Direct acquire when the console is not owned or is owned by a lower
priority context and is in a safe state.
2) Friendly handover mechanism uses a request/grant handshake. It is used
when the current owner has lower priority and the console is in an
unsafe state.
The requesting context:
a) Sets its priority into the 'req_prio' field.
b) Waits (with a timeout) for the owning context to unlock the
console.
c) Takes the lock and clears the 'req_prio' field.
The owning context:
a) Observes the 'req_prio' field set on exit from the unsafe
console state.
b) Gives up console ownership by clearing the 'prio' field.
3) Unsafe hostile takeover allows to take over the lock even when the
console is an unsafe state. It is used only in panic() by the final
attempt to flush consoles in a try and hope mode.
Note that separate record buffers are used in panic(). As a result,
the messages can be read and formatted without any risk even after
using the hostile takeover in unsafe state.
The release function simply clears the 'prio' field.
All operations on @console::nbcon_state are atomic cmpxchg based to
handle concurrency.
The acquire/release functions implement only minimal policies:
- Preference for higher priority contexts.
- Protection of the panic CPU.
All other policy decisions must be made at the call sites:
- What is marked as an unsafe section.
- Whether to spin-wait if there is already an owner and the console is
in an unsafe state.
- Whether to attempt an unsafe hostile takeover.
The design allows to implement the well known:
acquire()
output_one_printk_record()
release()
The output of one printk record might be interrupted with a higher priority
context. The new owner is supposed to reprint the entire interrupted record
from scratch.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-3-john.ogness@linutronix.de
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The current console/printk subsystem is protected by a Big Kernel Lock,
(aka console_lock) which has ill defined semantics and is more or less
stateless. This puts severe limitations on the console subsystem and
makes forced takeover and output in emergency and panic situations a
fragile endeavour that is based on try and pray.
The goal of non-BKL (nbcon) consoles is to break out of the console lock
jail and to provide a new infrastructure that avoids the pitfalls and
also allows console drivers to be gradually converted over.
The proposed infrastructure aims for the following properties:
- Per console locking instead of global locking
- Per console state that allows to make informed decisions
- Stateful handover and takeover
As a first step, state is added to struct console. The per console state
is an atomic_t using a 32bit bit field.
Reserve state bits, which will be populated later in the series. Wire
it up into the console register/unregister functionality.
It was decided to use a bitfield because using a plain u32 with
mask/shift operations resulted in uncomprehensible code.
Co-developed-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Thomas Gleixner (Intel) <tglx@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230916192007.608398-2-john.ogness@linutronix.de
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pr_flush() does not guarantee that all messages would really get flushed
to the console. The best it could do is to wait with a given timeout.[*]
The current interval 100ms for checking the progress might seem too
long in some situations. For example, such delays are not appreciated
during suspend and resume especially when the consoles have been flushed
"long" time before the check.
On the other hand, the sleeping wait might be useful in other situations.
Especially, it would allow flushing the messages using printk kthreads
on the same CPU[*].
Use msleep(1) as a compromise.
Also measure the time using jiffies. msleep() does not guarantee
precise wakeup after the given delay. It might be much longer,
especially for times < 20s. See Documentation/timers/timers-howto.rst
for more details.
Note that msecs_to_jiffies() already translates a negative value into
an infinite timeout.
[*] console_unlock() does not guarantee flushing the consoles since
the commit dbdda842fe96f893 ("printk: Add console owner and waiter
logic to load balance console writes").
It would be possible to guarantee it another way. For example,
the spinning might be enabled only when the console_lock has been
taken via console_trylock().
But the load balancing is helpful. And more importantly, the flush
with a timeout has been added as a preparation step for introducing
printk kthreads.
Signed-off-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: John Ogness <john.ogness@linutronix.de>
Link: https://lore.kernel.org/r/20231006082151.6969-3-pmladek@suse.com
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* uninline simple_strntoull(),
gcc overinlines and this function is not performance critical
* reorder arguments, so that appending INT_MAX as 4th argument
generates very efficient tail call
Space savings:
add/remove: 1/0 grow/shrink: 0/3 up/down: 27/-179 (-152)
Function old new delta
simple_strntoll - 27 +27
simple_strtoull 15 10 -5
simple_strtoll 41 7 -34
vsscanf 1930 1790 -140
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/all/82a2af6e-9b6c-4a09-89d7-ca90cc1cdad1@p183/
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In the following two functions, len has already been assigned a value of
0 when defining the variable, so remove 'len=0;'.
Signed-off-by: Li kunyu <kunyu@nfschina.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20231023062359.130633-1-kunyu@nfschina.com
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git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching
Pull livepatching update from Petr Mladek:
- Add missing newline character to avoid waiting for a continuous
message
* tag 'livepatching-for-6.7' of git://git.kernel.org/pub/scm/linux/kernel/git/livepatching/livepatching:
livepatch: Fix missing newline character in klp_resolve_symbols()
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Without the newline character, the log may not be printed immediately
after the error occurs.
Fixes: ca376a937486 ("livepatch: Prevent module-specific KLP rela sections from referencing vmlinux symbols")
Signed-off-by: Zheng Yejian <zhengyejian1@huawei.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20230914072644.4098857-1-zhengyejian1@huawei.com
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Pull bitmap updates from Yury Norov:
"This includes the 'bitmap: cleanup bitmap_*_region() implementation'
series, and scattered cleanup patches"
* tag 'bitmap-for-6.7' of https://github.com/norov/linux:
buildid: reduce header file dependencies for module
bitmap: move bitmap_*_region() functions to bitmap.h
bitmap: drop _reg_op() function
bitmap: replace _reg_op(REG_OP_ISFREE) with find_next_bit()
bitmap: replace _reg_op(REG_OP_RELEASE) with bitmap_clear()
bitmap: replace _reg_op(REG_OP_ALLOC) with bitmap_set()
bitmap: fix opencoded bitmap_allocate_region()
bitmap: add test for bitmap_*_region() functions
bitmap: align __reg_op() wrappers with modern coding style
lib/bitmap: split-out string-related operations to a separate files
bitmap: Remove dead code, i.e. bitmap_copy_le()
bitmap: Fix a typo ("identify map")
cpumask: kernel-doc cleanups and additions
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The vmlinux decompressor code intentionally has only a limited set of
included header files, but this started running into a build failure
because of the bitmap logic needing linux/errno.h:
In file included from include/linux/cpumask.h:12,
from include/linux/mm_types_task.h:14,
from include/linux/mm_types.h:5,
from include/linux/buildid.h:5,
from include/linux/module.h:14,
from arch/arm/boot/compressed/../../../../lib/lz4/lz4_decompress.c:39,
from arch/arm/boot/compressed/../../../../lib/decompress_unlz4.c:10,
from arch/arm/boot/compressed/decompress.c:60:
include/linux/bitmap.h: In function 'bitmap_allocate_region':
include/linux/bitmap.h:527:25: error: 'EBUSY' undeclared (first use in this function)
527 | return -EBUSY;
| ^~~~~
include/linux/bitmap.h:527:25: note: each undeclared identifier is reported only once for each function it appears in
include/linux/bitmap.h: In function 'bitmap_find_free_region':
include/linux/bitmap.h:554:17: error: 'ENOMEM' undeclared (first use in this function)
554 | return -ENOMEM;
| ^~~~~~
This is easily avoided by changing linux/buildid.h to no longer depend on
linux/mm_types.h, a header that pulls in a huge number of indirect dependencies.
Fixes: b9c957f554442 ("bitmap: move bitmap_*_region() functions to bitmap.h")
Fixes: bd7525dacd7e2 ("bpf: Move stack_map_get_build_id into lib")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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Now that bitmap_*_region() functions are implemented as thin wrappers
around others, it's worth to move them to the header, as it opens room
for compile-time optimizations.
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
CC: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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Now that all _reg_op() users are switched to alternative functions,
_reg_op() machinery is not needed anymore.
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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_reg_op(REG_OP_ISFREE) can be trivially replaced with find_next_bit().
Doing that opens room for potential small_const_nbits() optimization.
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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_reg_op(REG_OP_RELEASE) duplicates bitmap_clear().
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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_reg_op(REG_OP_ALLOC) duplicates bitmap_set().
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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bitmap_find_region() opencodes bitmap_allocate_region().
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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Test basic functionality of bitmap_{allocate,release,find_free}_region()
functions.
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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Fix comments so that scripts/kernel-doc doesn't warn, and fix for-loop
stype in bitmap_find_free_region().
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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lib/bitmap.c and corresponding include/linux/bitmap.h are intended to
hold functions related to operations on bitmaps, like bitmap_shift or
bitmap_set. Historically, some string-related operations like
bitmap_parse are also reside in lib/bitmap.c.
Now that the subsystem evolves, string-related bitmap operations became a
significant part of the file. Because they are quite different from the
other bitmap functions by nature, it's worth to split them to a separate
source/header files.
CC: Andrew Morton <akpm@linux-foundation.org>
CC: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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Besides the fact it's not used anywhere it should be implemented
differently, i.e. via helpers from linux/byteorder/generic.h.
Yet the helpers themselves need to be introduced first.
Also note, the function lacks of the test cases, they must be provided.
Hence, drop the current dead code for good.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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A map in which each element is mapped to itself is called an "identity
map".
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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Clean up some punctutation and abbreviations.
Add kernel-doc notation for one function and function return value
for 39 functions.
cpumask.h:
Fix some punctuation (plural vs. possessive).
Fix some abbreviations (ie. -> i.e., id -> ID).
Fix 35 warnings like this:
include/linux/cpumask.h:161: warning: No description found for return value of 'cpumask_first'
cpumask.c:
Add Return: value for 4 functions.
Add kernel-doc for cpumask_any_distribute().
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-MM updates from Andrew Morton:
"As usual, lots of singleton and doubleton patches all over the tree
and there's little I can say which isn't in the individual changelogs.
The lengthier patch series are
- 'kdump: use generic functions to simplify crashkernel reservation
in arch', from Baoquan He. This is mainly cleanups and
consolidation of the 'crashkernel=' kernel parameter handling
- After much discussion, David Laight's 'minmax: Relax type checks in
min() and max()' is here. Hopefully reduces some typecasting and
the use of min_t() and max_t()
- A group of patches from Oleg Nesterov which clean up and slightly
fix our handling of reads from /proc/PID/task/... and which remove
task_struct.thread_group"
* tag 'mm-nonmm-stable-2023-11-02-14-08' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (64 commits)
scripts/gdb/vmalloc: disable on no-MMU
scripts/gdb: fix usage of MOD_TEXT not defined when CONFIG_MODULES=n
.mailmap: add address mapping for Tomeu Vizoso
mailmap: update email address for Claudiu Beznea
tools/testing/selftests/mm/run_vmtests.sh: lower the ptrace permissions
.mailmap: map Benjamin Poirier's address
scripts/gdb: add lx_current support for riscv
ocfs2: fix a spelling typo in comment
proc: test ProtectionKey in proc-empty-vm test
proc: fix proc-empty-vm test with vsyscall
fs/proc/base.c: remove unneeded semicolon
do_io_accounting: use sig->stats_lock
do_io_accounting: use __for_each_thread()
ocfs2: replace BUG_ON() at ocfs2_num_free_extents() with ocfs2_error()
ocfs2: fix a typo in a comment
scripts/show_delta: add __main__ judgement before main code
treewide: mark stuff as __ro_after_init
fs: ocfs2: check status values
proc: test /proc/${pid}/statm
compiler.h: move __is_constexpr() to compiler.h
...
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vmap_area does not exist on no-MMU, therefore the GDB scripts fail to
load:
Traceback (most recent call last):
File "<...>/vmlinux-gdb.py", line 51, in <module>
import linux.vmalloc
File "<...>/scripts/gdb/linux/vmalloc.py", line 14, in <module>
vmap_area_ptr_type = vmap_area_type.get_type().pointer()
^^^^^^^^^^^^^^^^^^^^^^^^^
File "<...>/scripts/gdb/linux/utils.py", line 28, in get_type
self._type = gdb.lookup_type(self._name)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
gdb.error: No struct type named vmap_area.
To fix this, disable the command and add an informative error message if
CONFIG_MMU is not defined, following the example of lx-slabinfo.
Link: https://lkml.kernel.org/r/20231031202235.2655333-2-ben.wolsieffer@hefring.com
Fixes: 852622bf3616 ("scripts/gdb/vmalloc: add vmallocinfo support")
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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MOD_TEXT is only defined if CONFIG_MODULES=y which lead to loading failure
of the gdb scripts when kernel is built without CONFIG_MODULES=y:
Reading symbols from vmlinux...
Traceback (most recent call last):
File "/foo/vmlinux-gdb.py", line 25, in <module>
import linux.constants
File "/foo/scripts/gdb/linux/constants.py", line 14, in <module>
LX_MOD_TEXT = gdb.parse_and_eval("MOD_TEXT")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
gdb.error: No symbol "MOD_TEXT" in current context.
Add a conditional check on CONFIG_MODULES to fix this error.
Link: https://lkml.kernel.org/r/20231031134848.119391-1-da.gomez@samsung.com
Fixes: b4aff7513df3 ("scripts/gdb: use mem instead of core_layout to get the module address")
Signed-off-by: Clément Léger <cleger@rivosinc.com>
Tested-by: Daniel Gomez <da.gomez@samsung.com>
Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Pankaj Raghav <p.raghav@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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He's no longer working in Collabora (and his email address there bounces).
Map it to his personal address.
Link: https://lkml.kernel.org/r/20231031014009.22765-2-bagasdotme@gmail.com
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Tomeu Vizoso <tomeu@tomeuvizoso.net>
Cc: Bjorn Andersson <quic_bjorande@quicinc.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Claudiu Beznea's Microchip email address is no longer valid.
Map it to a valid one.
Link: https://lkml.kernel.org/r/20231030063632.1707372-1-claudiu.beznea@tuxon.dev
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>
Cc: Bjorn Andersson <quic_bjorande@quicinc.com>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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On Ubuntu and probably other distros, ptrace permissions are tightend a
bit by default; i.e., /proc/sys/kernel/yama/ptrace_score is set to 1.
This cases memfd_secret's ptrace attach test fails with a permission
error. Set it to 0 piror to running the program.
Link: https://lkml.kernel.org/r/20231030-selftest-v1-1-743df68bb996@linux.dev
Signed-off-by: Itaru Kitayama <itaru.kitayama@linux.dev>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Map out to his gmail address as he had left SUSE some time ago.
Link: https://lkml.kernel.org/r/20231030142454.22127-2-bagasdotme@gmail.com
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Acked-by: Benjamin Poirier <benjamin.poirier@gmail.com>
Cc: Bjorn Andersson <quic_bjorande@quicinc.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Konrad Dybcio <konrad.dybcio@linaro.org>
Cc: Oleksij Rempel <o.rempel@pengutronix.de>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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csr_sscratch CSR holds current task_struct address when hart is in user
space. Trap handler on entry spills csr_sscratch into "tp" (x2) register
and zeroes out csr_sscratch CSR. Trap handler on exit reloads "tp" with
expected user mode value and place current task_struct address again in
csr_sscratch CSR.
This patch assumes "tp" is pointing to task_struct. If value in
csr_sscratch is numerically greater than "tp" then it assumes csr_sscratch
is correct address of current task_struct. This logic holds when
- hart is in user space, "tp" will be less than csr_sscratch.
- hart is in kernel space but not in trap handler, "tp" will be more
than csr_sscratch (csr_sscratch being equal to 0).
- hart is executing trap handler
- "tp" is still pointing to user mode but csr_sscratch contains
ptr to task_struct. Thus numerically higher.
- "tp" is pointing to task_struct but csr_sscratch now contains
either 0 or numerically smaller value (transiently holds
user mode tp)
Link: https://lkml.kernel.org/r/20231026233837.612405-1-debug@rivosinc.com
Signed-off-by: Deepak Gupta <debug@rivosinc.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Palmer Dabbelt <palmer@rivosinc.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Tested-by: Hsieh-Tseng Shen <woodrow.shen@sifive.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Glenn Washburn <development@efficientek.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>
Cc: Jeff Xie <xiehuan09@gmail.com>
Cc: Kieran Bingham <kbingham@kernel.org>
Cc: Palmer Dabbelt <palmer@rivosinc.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Fix a spelling typo in comment.
Link: https://lkml.kernel.org/r/20231025072906.14285-1-chentao@kylinos.cn
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Check ProtectionKey field in /proc/*/smaps output, if system supports
protection keys feature.
[adobriyan@gmail.com: test support in the beginning of the program, use syscall, not glibc pkey_alloc(3) which may not compile]
Link: https://lkml.kernel.org/r/ac05efa7-d2a0-48ad-b704-ffdd5450582e@p183
Signed-off-by: Swarup Laxman Kotiaklapudi <swarupkotikalapudi@gmail.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Reviewed-by: Swarup Laxman Kotikalapudi<swarupkotikalapudi@gmail.com>
Tested-by: Swarup Laxman Kotikalapudi<swarupkotikalapudi@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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* fix embarassing /proc/*/smaps test bug due to a typo in variable name
it tested only the first line of the output if vsyscall is enabled:
ffffffffff600000-ffffffffff601000 r-xp ...
so test passed but tested only VMA location and permissions.
* add "KSM" entry, unnoticed because (1)
* swap "r-xp" and "--xp" vsyscall test strings,
also unnoticed because (1)
Link: https://lkml.kernel.org/r/76f42cce-b1ab-45ec-b6b2-4c64f0dccb90@p183
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Tested-by: Swarup Laxman Kotikalapudi<swarupkotikalapudi@mail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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./fs/proc/base.c:3829:2-3: Unneeded semicolon
Link: https://lkml.kernel.org/r/20231026005634.6581-1-yang.lee@linux.alibaba.com
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7057
Acked-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Rather than lock_task_sighand(), sig->stats_lock was specifically designed
for this type of use.
This way the "if (whole)" branch runs lockless in the likely case.
Link: https://lkml.kernel.org/r/20231023153405.GA4639@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Rather than while_each_thread() which should be avoided when possible.
This makes the code more clear and allows the next change.
Link: https://lkml.kernel.org/r/20231023153343.GA4629@redhat.com
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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The BUG_ON() at ocfs2_num_free_extents() handles the error that
l_tree_deepth of leaf extent block just read form disk is invalid. This
error is mostly caused by file system metadata corruption on the disk.
There is no need to call BUG_ON() to handle such errors. We can return
error code, since the caller can deal with errors from
ocfs2_num_free_extents(). Also, we should make the file system read-only
to avoid the damage from expanding.
Therefore, BUG_ON() is removed and ocfs2_error() is called instead.
Link: https://lkml.kernel.org/r/20231018191811.412458-1-jindui71@gmail.com
Signed-off-by: Jia Rui <jindui71@gmail.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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Fix spelling typo in comment.
Link: https://lkml.kernel.org/r/20231011163216.29446-1-yuanhengzhang1214@gmail.com
Signed-off-by: Yuanheng Zhang <yuanhengzhang1214@gmail.com>
Acked-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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