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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-01 18:41:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-01 18:41:13 -0700
commitdf43d903828c59afb9e93b59835127a02e1f8144 (patch)
tree39be64267622b2efe8e2fc39298a4245d76f2337 /arch
parent9e5f3ffcf1cb34e7c7beb3f79a96f58536730924 (diff)
parentc985aafb60e972c0a6b8d0bd65e03af5890b748a (diff)
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Merge tag 'printk-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux
Pull printk updates from Petr Mladek: - Optionally, provide an index of possible printk messages via <debugfs>/printk/index/. It can be used when monitoring important kernel messages on a farm of various hosts. The monitor has to be updated when some messages has changed or are not longer available by a newly deployed kernel. - Add printk.console_no_auto_verbose boot parameter. It allows to generate crash dump even with slow consoles in a reasonable time frame. - Remove printk_safe buffers. The messages are always stored directly to the main logbuffer, even in NMI or recursive context. Also it allows to serialize syslog operations by a mutex instead of a spin lock. - Misc clean up and build fixes. * tag 'printk-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux: printk/index: Fix -Wunused-function warning lib/nmi_backtrace: Serialize even messages about idle CPUs printk: Add printk.console_no_auto_verbose boot parameter printk: Remove console_silent() lib/test_scanf: Handle n_bits == 0 in random tests printk: syslog: close window between wait and read printk: convert @syslog_lock to mutex printk: remove NMI tracking printk: remove safe buffers printk: track/limit recursion lib/nmi_backtrace: explicitly serialize banner and regs printk: Move the printk() kerneldoc comment to its new home printk/index: Fix warning about missing prototypes MIPS/asm/printk: Fix build failure caused by printk printk: index: Add indexing support to dev_printk printk: Userspace format indexing support printk: Rework parse_prefix into printk_parse_prefix printk: Straighten out log_flags into printk_info_flags string_helpers: Escape double quotes in escape_special printk/console: Check consistent sequence number when handling race in console_unlock()
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/entry-v7m.S2
-rw-r--r--arch/arm/kernel/smp.c4
-rw-r--r--arch/arm/lib/backtrace-clang.S2
-rw-r--r--arch/arm/lib/backtrace.S2
-rw-r--r--arch/arm/mach-rpc/io-acorn.S2
-rw-r--r--arch/arm/vfp/vfphw.S6
-rw-r--r--arch/ia64/include/uapi/asm/cmpxchg.h4
-rw-r--r--arch/mips/include/asm/asm.h2
-rw-r--r--arch/openrisc/kernel/entry.S6
-rw-r--r--arch/powerpc/kernel/head_fsl_booke.S2
-rw-r--r--arch/powerpc/kernel/traps.c1
-rw-r--r--arch/powerpc/kernel/watchdog.c5
-rw-r--r--arch/powerpc/kexec/crash.c2
-rw-r--r--arch/um/include/shared/user.h3
-rw-r--r--arch/x86/kernel/head_32.S2
15 files changed, 20 insertions, 25 deletions
diff --git a/arch/arm/kernel/entry-v7m.S b/arch/arm/kernel/entry-v7m.S
index d0e898608d30..7bde93c10962 100644
--- a/arch/arm/kernel/entry-v7m.S
+++ b/arch/arm/kernel/entry-v7m.S
@@ -23,7 +23,7 @@ __invalid_entry:
adr r0, strerr
mrs r1, ipsr
mov r2, lr
- bl printk
+ bl _printk
#endif
mov r0, sp
bl show_regs
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index c7bb168b0d97..842427ff2b3c 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -667,9 +667,9 @@ static void do_handle_IPI(int ipinr)
break;
case IPI_CPU_BACKTRACE:
- printk_nmi_enter();
+ printk_deferred_enter();
nmi_cpu_backtrace(get_irq_regs());
- printk_nmi_exit();
+ printk_deferred_exit();
break;
default:
diff --git a/arch/arm/lib/backtrace-clang.S b/arch/arm/lib/backtrace-clang.S
index 6174c45f53a5..5b2cdb1003e3 100644
--- a/arch/arm/lib/backtrace-clang.S
+++ b/arch/arm/lib/backtrace-clang.S
@@ -202,7 +202,7 @@ finished_setup:
1006: adr r0, .Lbad
mov r1, loglvl
mov r2, frame
- bl printk
+ bl _printk
no_frame: ldmfd sp!, {r4 - r9, fp, pc}
ENDPROC(c_backtrace)
.pushsection __ex_table,"a"
diff --git a/arch/arm/lib/backtrace.S b/arch/arm/lib/backtrace.S
index 872f658638d9..e8408f22d4dc 100644
--- a/arch/arm/lib/backtrace.S
+++ b/arch/arm/lib/backtrace.S
@@ -103,7 +103,7 @@ for_each_frame: tst frame, mask @ Check for address exceptions
1006: adr r0, .Lbad
mov r1, loglvl
mov r2, frame
- bl printk
+ bl _printk
no_frame: ldmfd sp!, {r4 - r9, pc}
ENDPROC(c_backtrace)
diff --git a/arch/arm/mach-rpc/io-acorn.S b/arch/arm/mach-rpc/io-acorn.S
index b9082a2a2a01..aa9bf0d771c0 100644
--- a/arch/arm/mach-rpc/io-acorn.S
+++ b/arch/arm/mach-rpc/io-acorn.S
@@ -25,4 +25,4 @@ ENTRY(insl)
ENTRY(outsl)
adr r0, .Liosl_warning
mov r1, lr
- b printk
+ b _printk
diff --git a/arch/arm/vfp/vfphw.S b/arch/arm/vfp/vfphw.S
index d5837bf05a9a..6f7926c9c179 100644
--- a/arch/arm/vfp/vfphw.S
+++ b/arch/arm/vfp/vfphw.S
@@ -23,7 +23,7 @@
#ifdef DEBUG
stmfd sp!, {r0-r3, ip, lr}
ldr r0, =1f
- bl printk
+ bl _printk
ldmfd sp!, {r0-r3, ip, lr}
.pushsection .rodata, "a"
@@ -38,7 +38,7 @@
stmfd sp!, {r0-r3, ip, lr}
mov r1, \arg
ldr r0, =1f
- bl printk
+ bl _printk
ldmfd sp!, {r0-r3, ip, lr}
.pushsection .rodata, "a"
@@ -55,7 +55,7 @@
mov r2, \arg2
mov r1, \arg1
ldr r0, =1f
- bl printk
+ bl _printk
ldmfd sp!, {r0-r3, ip, lr}
.pushsection .rodata, "a"
diff --git a/arch/ia64/include/uapi/asm/cmpxchg.h b/arch/ia64/include/uapi/asm/cmpxchg.h
index 926c6cb1e029..2c2f3cfeaa77 100644
--- a/arch/ia64/include/uapi/asm/cmpxchg.h
+++ b/arch/ia64/include/uapi/asm/cmpxchg.h
@@ -143,9 +143,9 @@ extern long ia64_cmpxchg_called_with_bad_pointer(void);
do { \
if (_cmpxchg_bugcheck_count-- <= 0) { \
void *ip; \
- extern int printk(const char *fmt, ...); \
+ extern int _printk(const char *fmt, ...); \
ip = (void *) ia64_getreg(_IA64_REG_IP); \
- printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
+ _printk("CMPXCHG_BUGCHECK: stuck at %p on word %p\n", ip, (v));\
break; \
} \
} while (0)
diff --git a/arch/mips/include/asm/asm.h b/arch/mips/include/asm/asm.h
index ea4b62ece336..2f8ce94ebaaf 100644
--- a/arch/mips/include/asm/asm.h
+++ b/arch/mips/include/asm/asm.h
@@ -114,7 +114,7 @@ symbol = value
.set push; \
.set reorder; \
PTR_LA a0, 8f; \
- jal printk; \
+ jal _printk; \
.set pop; \
TEXT(string)
#else
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S
index bc657e55c15f..947613f61d4a 100644
--- a/arch/openrisc/kernel/entry.S
+++ b/arch/openrisc/kernel/entry.S
@@ -551,7 +551,7 @@ EXCEPTION_ENTRY(_external_irq_handler)
l.movhi r3,hi(42f)
l.ori r3,r3,lo(42f)
l.sw 0x0(r1),r3
- l.jal printk
+ l.jal _printk
l.sw 0x4(r1),r4
l.addi r1,r1,0x8
@@ -681,8 +681,8 @@ _syscall_debug:
l.sw -4(r1),r27
l.sw -8(r1),r11
l.addi r1,r1,-8
- l.movhi r27,hi(printk)
- l.ori r27,r27,lo(printk)
+ l.movhi r27,hi(_printk)
+ l.ori r27,r27,lo(_printk)
l.jalr r27
l.nop
l.addi r1,r1,8
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 0f9642f36b49..9a2f4265e6d2 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -858,7 +858,7 @@ KernelSPE:
ori r3,r3,87f@l
mr r4,r2 /* current */
lwz r5,_NIP(r1)
- bl printk
+ bl _printk
#endif
b interrupt_return
#ifdef CONFIG_PRINTK
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index d56254f05e17..cd5f633c9b1b 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -171,7 +171,6 @@ extern void panic_flush_kmsg_start(void)
extern void panic_flush_kmsg_end(void)
{
- printk_safe_flush_on_panic();
kmsg_dump(KMSG_DUMP_PANIC);
bust_spinlocks(0);
debug_locks_off();
diff --git a/arch/powerpc/kernel/watchdog.c b/arch/powerpc/kernel/watchdog.c
index a165635fd214..f9ea0e5357f9 100644
--- a/arch/powerpc/kernel/watchdog.c
+++ b/arch/powerpc/kernel/watchdog.c
@@ -184,11 +184,6 @@ static void watchdog_smp_panic(int cpu, u64 tb)
wd_smp_unlock(&flags);
- printk_safe_flush();
- /*
- * printk_safe_flush() seems to require another print
- * before anything actually goes out to console.
- */
if (sysctl_hardlockup_all_cpu_backtrace)
trigger_allbutself_cpu_backtrace();
diff --git a/arch/powerpc/kexec/crash.c b/arch/powerpc/kexec/crash.c
index 10f997e6bb95..22ceeeb705ab 100644
--- a/arch/powerpc/kexec/crash.c
+++ b/arch/powerpc/kexec/crash.c
@@ -313,7 +313,7 @@ void default_machine_crash_shutdown(struct pt_regs *regs)
int (*old_handler)(struct pt_regs *regs);
/* Avoid hardlocking with irresponsive CPU holding logbuf_lock */
- printk_nmi_enter();
+ printk_deferred_enter();
/*
* This function is only called after the system
diff --git a/arch/um/include/shared/user.h b/arch/um/include/shared/user.h
index e793e4212f0a..dd4badffdeb3 100644
--- a/arch/um/include/shared/user.h
+++ b/arch/um/include/shared/user.h
@@ -38,7 +38,8 @@ extern void panic(const char *fmt, ...)
#define UM_KERN_CONT KERN_CONT
#ifdef UML_CONFIG_PRINTK
-extern int printk(const char *fmt, ...)
+#define printk(...) _printk(__VA_ARGS__)
+extern int _printk(const char *fmt, ...)
__attribute__ ((format (printf, 1, 2)));
#else
static inline int printk(const char *fmt, ...)
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 67f590425d90..d8c64dab0efe 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -432,7 +432,7 @@ SYM_FUNC_START(early_ignore_irq)
pushl 32(%esp)
pushl 40(%esp)
pushl $int_msg
- call printk
+ call _printk
call dump_stack