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* kernel/params.c: use scnprintf() instead of sprintf()Chen Gang2013-08-201-3/+4
| | | | | | | | | For some strings (e.g. version string), they are permitted to be larger than PAGE_SIZE (although meaningless), so recommend to use scnprintf() instead of sprintf(). Signed-off-by: Chen Gang <gang.chen@asianux.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module: Add flag to allow mod params to have no argumentsSteven Rostedt2013-08-201-2/+4
| | | | | | | | | | | | | | | | | | | | | Currently the params.c code allows only two "set" functions to have no arguments. If a parameter does not have an argument, then it looks at the set function and tests if it is either param_set_bool() or param_set_bint(). If it is not one of these functions, then it fails the loading of the module. But there may be module parameters that have different set functions and still allow no arguments. But unless each of these cases adds their function to the if statement, it wont be allowed to have no arguments. This method gets rather messing and does not scale. Instead, introduce a flags field to the kernel_param_ops, where if the flag KERNEL_PARAM_FL_NOARG is set, the parameter will not fail if it does not contain an argument. It will be expected that the corresponding set function can handle a NULL pointer as "val". Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module: fix sprintf format specifier in param_get_byte()Christoph Jaeger2013-08-201-1/+1
| | | | | | | | | | | | | | | | | | | In param_get_byte(), to which the macro STANDARD_PARAM_DEF(byte, ...) expands, "%c" is used to print an unsigned char. So it gets printed as a character what is not intended here. Use "%hhu" instead. [Rusty: note drivers which would be effected: drivers/net/wireless/cw1200/main.c drivers/ntb/ntb_transport.c:68 drivers/scsi/lpfc/lpfc_attr.c drivers/usb/atm/speedtch.c drivers/usb/gadget/g_ffs.c ] Acked-by: Jon Mason <jon.mason@intel.com> (for ntb) Acked-by: Michal Nazarewicz <mina86@mina86.com> (for g_ffs.c) Signed-off-by: Christoph Jaeger <christophjaeger@linux.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* There is no /sys/parametersJean Delvare2013-07-021-1/+1
| | | | | | | | | There is no such path as /sys/parameters, module parameters live in /sys/module/*/parameters. Signed-off-by: Jean Delvare <khali@linux-fr.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* params: Fix potential memory leak in add_sysfs_param()David Woodhouse2013-03-181-1/+4
| | | | | | | | | | | On allocation failure, it would fail to free the old attrs array which was no longer referenced by anything (since it would free the old module_param_attrs struct on the way out). Comment the suspicious-looking krealloc() usage to explain why it *isn't* actually buggy, despite looking like a classic realloc() usage bug. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
* params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)Jim Cromie2012-05-041-21/+12
| | | | | | | | | | | | | | I left 1 printk which uses __FILE__, __LINE__ explicitly, which should not be subject to generic preferences expressed via pr_fmt(). + tweaks suggested by Joe Perches: - add doing to irq-enabled warning, like others. It wont happen often.. - change sysfs failure crit, not just err, make it 1 line in logs. - coalese 2 format fragments into 1 >80 char line cc: Joe Perches <joe@perches.com> Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* params.c: fix Smack complaint about parse_argsJim Cromie2012-05-041-1/+1
| | | | | | | | | | | | In commit 9fb48c744: "params: add 3rd arg to option handler callback signature", the if-guard added to the pr_debug was overzealous; no callers pass NULL, and existing code above and below the guard assumes as much. Change the if-guard to match, and silence the Smack complaint. CC: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* params: add 3rd arg to option handler callback signatureJim Cromie2012-04-301-14/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add a 3rd arg, named "doing", to unknown-options callbacks invoked from parse_args(). The arg is passed as: "Booting kernel" from start_kernel(), initcall_level_names[i] from do_initcall_level(), mod->name from load_module(), via parse_args(), parse_one() parse_args() already has the "name" parameter, which is renamed to "doing" to better reflect current uses 1,2 above. parse_args() passes it to an altered parse_one(), which now passes it down into the unknown option handler callbacks. The mod->name will be needed to handle dyndbg for loadable modules, since params passed by modprobe are not qualified (they do not have a "$modname." prefix), and by the time the unknown-param callback is called, the module name is not otherwise available. Minor tweaks: Add param-name to parse_one's pr_debug(), current message doesnt identify the param being handled, add it. Add a pr_info to print current level and level_name of the initcall, and number of registered initcalls at that level. This adds 7 lines to dmesg output, like: initlevel:6=device, 172 registered initcalls Drop "parameters" from initcall_level_names[], its unhelpful in the pr_info() added above. This array is passed into parse_args() by do_initcall_level(). CC: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Acked-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* params: <level>_initcall-like kernel parametersPawel Moll2012-03-261-4/+12
| | | | | | | | | | | | | | | This patch adds a set of macros that can be used to declare kernel parameters to be parsed _before_ initcalls at a chosen level are executed. We rename the now-unused "flags" field of struct kernel_param as the level. It's signed, for when we use this for early params as well, in future. Linker macro collating init calls had to be modified in order to add additional symbols between levels that are later used by the init code to split the calls into blocks. Signed-off-by: Pawel Moll <pawel.moll@arm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module_param: remove support for bool parameters which are really int.Rusty Russell2012-03-261-21/+2
| | | | | | | | | | | module_param(bool) used to counter-intuitively take an int. In fddd5201 (mid-2009) we allowed bool or int/unsigned int using a messy trick. This eliminates that code (though leaves the flags field in the struct, for impending use). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* includecheck: delete any duplicate instances of module.hPaul Gortmaker2012-02-281-1/+0
| | | | | | | | | | | | Different tree maintainers picked up independently generated trivial compile fixes based on linux-next testing, resulting in some cases where a file would have got more than one addition of module.h once everything was all merged together. Delete any duplicates so includecheck isn't complaining about anything related to module.h/export.h changes. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* module: make module param bint handle nul valueDave Young2012-02-141-1/+2
| | | | | | | | Allow bint param accept nul values, just do same as bool param. Signed-off-by: Dave Young <dyoung@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module_param: avoid bool abuse, add bint for special cases.Rusty Russell2012-01-131-0/+24
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | For historical reasons, we allow module_param(bool) to take an int (or an unsigned int). That's going away. A few drivers really want an int: they set it to -1 and a parameter will set it to 0 or 1. This sucks: reading them from sysfs will give 'Y' for both -1 and 1, but if we change it to an int, then the users might be broken (if they did "param" instead of "param=1"). Use a new 'bint' parser for them. (ntfs has a different problem: it needs an int for debug_msgs because it's also exposed via sysctl.) Cc: Steve Glendinning <steve.glendinning@smsc.com> Cc: Jean Delvare <khali@linux-fr.org> Cc: Guenter Roeck <guenter.roeck@ericsson.com> Cc: Hoang-Nam Nguyen <hnguyen@de.ibm.com> Cc: Christoph Raisch <raisch@de.ibm.com> Cc: Roland Dreier <roland@kernel.org> Cc: Sean Hefty <sean.hefty@intel.com> Cc: Hal Rosenstock <hal.rosenstock@gmail.com> Cc: linux390@de.ibm.com Cc: Anton Altaparmakov <anton@tuxera.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.de> Cc: lm-sensors@lm-sensors.org Cc: linux-rdma@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linux-ntfs-dev@lists.sourceforge.net Cc: alsa-devel@alsa-project.org Acked-by: Takashi Iwai <tiwai@suse.de> (For the sound part) Acked-by: Guenter Roeck <guenter.roeck@ericsson.com> (For the hwmon driver) Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* kernel/params: replace DEBUGP with pr_debugJim Cromie2012-01-131-10/+4
| | | | | | | | | | | Use more flexible pr_debug. This allows: echo "module params +p" > /dbg/dynamic_debug/control to turn on debug messages when needed. Signed-off-by: Jim Cromie <jim.cromie@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* kernel: params.c needs module.h not moduleparam.hPaul Gortmaker2011-10-311-1/+1
| | | | | | | | | | | | | | Through various other implicit include paths, some files were getting the full module.h file, and hence living the illusion that they really only needed moduleparam.h -- but the reality is that once you remove the module.h presence, these show up: kernel/params.c:583: warning: ‘struct module_kobject’ declared inside parameter list Such files really require module.h so simply make it so. As the file module.h grabs moduleparam.h on the fly, all will be well. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
* params: make dashes and underscores in parameter names truly equalMichal Schmidt2011-10-261-7/+14
| | | | | | | | | | | | | | | | | The user may use "foo-bar" for a kernel parameter defined as "foo_bar". Make sure it works the other way around too. Apply the equality of dashes and underscores on early_params and __setup params as well. The example given in Documentation/kernel-parameters.txt indicates that this is the intended behaviour. With the patch the kernel accepts "log-buf-len=1M" as expected. https://bugzilla.redhat.com/show_bug.cgi?id=744545 Signed-off-by: Michal Schmidt <mschmidt@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (neatened implementations)
* module: add /sys/module/<name>/uevent filesKay Sievers2011-07-241-0/+4
| | | | | | | | | | | | | | | | | Userspace wants to manage module parameters with udev rules. This currently only works for loaded modules, but not for built-in ones. To allow access to the built-in modules we need to re-trigger all module load events that happened before any userspace was running. We already do the same thing for all devices, subsystems(buses) and drivers. This adds the currently missing /sys/module/<name>/uevent files to all module entries. Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (split & trivial fix)
* module: change attr callbacks to take struct module_kobjectKay Sievers2011-07-241-5/+5
| | | | | | | | This simplifies the next patch, where we have an attribute on a builtin module (ie. module == NULL). Signed-off-by: Kay Sievers <kay.sievers@vrfy.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (split into 2)
* param: fix return value handling in param_set_*Satoru Moriya2011-07-241-2/+2
| | | | | | | | | | | | | | | In STANDARD_PARAM_DEF, param_set_* handles the case in which strtolfn returns -EINVAL but it may return -ERANGE. If it returns -ERANGE, param_set_* may set uninitialized value to the paramerter. We should handle both cases. The one of the cases in which strtolfn() returns -ERANGE is following: *Type of module parameter is long *Set the parameter more than LONG_MAX Signed-off-by: Satoru Moriya <satoru.moriya@hds.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* params.c: Use new strtobool function to process boolean inputsJonathan Cameron2011-05-191-10/+4
| | | | | Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module: deal with alignment issues in built-in module versionsDmitry Torokhov2011-05-191-3/+6
| | | | | | | | | | | | | | | | | | | | On m68k natural alignment is 2-byte boundary but we are trying to align structures in __modver section on sizeof(void *) boundary. This causes trouble when we try to access elements in this section in array-like fashion when create "version" attributes for built-in modules. Moreover, as DaveM said, we can't reliably put structures into independent objects, put them into a special section, and then expect array access over them (via the section boundaries) after linking the objects together to just "work" due to variable alignment choices in different situations. The only solution that seems to work reliably is to make an array of plain pointers to the objects in question and put those pointers in the special section. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Fix common misspellingsLucas De Marchi2011-03-311-1/+1
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* module: show version information for built-in modules in sysfsDmitry Torokhov2011-01-241-11/+54
| | | | | | | | | | | | | | | | Currently only drivers that are built as modules have their versions shown in /sys/module/<module_name>/version, but this information might also be useful for built-in drivers as well. This especially important for drivers that do not define any parameters - such drivers, if built-in, are completely invisible from userspace. This patch changes MODULE_VERSION() macro so that in case when we are compiling built-in module, version information is stored in a separate section. Kernel then uses this data to create 'version' sysfs attribute in the same fashion it creates attributes for module parameters. Signed-off-by: Dmitry Torokhov <dtor@vmware.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* param: locking for kernel parametersRusty Russell2010-08-111-7/+26
| | | | | | | | | | | | | There may be cases (most obviously, sysfs-writable charp parameters) where a module needs to prevent sysfs access to parameters. Rather than express this in terms of a big lock, the functions are expressed in terms of what they protect against. This is clearer, esp. if the implementation changes to a module-level or even param-level lock. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
* param: make param sections const.Rusty Russell2010-08-111-2/+2
| | | | | | | | Since this section can be read-only (they're in .rodata), they should always have been const. Minor flow-through various functions. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
* param: use free hook for charp (fix leak of charp parameters)Rusty Russell2010-08-111-2/+50
| | | | | | | | | | | | | | | Instead of using a "I kmalloced this" flag, we keep track of the kmalloced strings and use that list to check if we need to kfree (in practice, the list is very short). This means that kparams can be const again, and plugs a leak. This is important for drivers/usb/gadget/nokia.c which gets modprobe/rmmod'ed frequently on the N9000. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Cc: Artem Bityutskiy <dedekind1@gmail.com> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
* param: add a free hook to kernel_param_ops.Rusty Russell2010-08-111-1/+16
| | | | | | | | | This allows us to generalize the KPARAM_KMALLOCED flag, by calling a function on every parameter when a module is unloaded. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
* param: use ops in struct kernel_param, rather than get and set fns directlyRusty Russell2010-08-111-28/+62
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This is more kernel-ish, saves some space, and also allows us to expand the ops without breaking all the callers who are happy for the new members to be NULL. The few places which defined their own param types are changed to the new scheme (more which crept in recently fixed in following patches). Since we're touching them anyway, we change get() and set() to take a const struct kernel_param (which they really are). This causes some harmless warnings until we fix them (in following patches). To reduce churn, module_param_call creates the ops struct so the callers don't have to change (and casts the functions to reduce warnings). The modern version which takes an ops struct is called module_param_cb. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Ville Syrjala <syrjala@sci.fi> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Alessandro Rubini <rubini@ipvvis.unipv.it> Cc: Michal Januszewski <spock@gentoo.org> Cc: Trond Myklebust <Trond.Myklebust@netapp.com> Cc: "J. Bruce Fields" <bfields@fieldses.org> Cc: Neil Brown <neilb@suse.de> Cc: linux-kernel@vger.kernel.org Cc: linux-input@vger.kernel.org Cc: linux-fbdev-devel@lists.sourceforge.net Cc: linux-nfs@vger.kernel.org Cc: netdev@vger.kernel.org
* param: move the EXPORT_SYMBOL to after the definitions.Rusty Russell2010-08-111-26/+13
| | | | | | | | This is modern style, and good to do before we start changing things. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de> Tested-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
* params: don't hand NULL values to param.set callbacks.Rusty Russell2010-08-111-17/+3
| | | | | | | | | | | | | An audit by Dongdong Deng revealed that most driver-author-written param calls don't handle val == NULL (which happens when parameters are specified with no =, eg "foo" instead of "foo=1"). The only real case to use this is boolean, so handle it specially for that case and remove a source of bugs for everyone else. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Dongdong Deng <dongdong.deng@windriver.com> Cc: Américo Wang <xiyou.wangcong@gmail.com>
* Merge branch 'for-linus' of ↵Linus Torvalds2010-03-121-3/+3
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (56 commits) doc: fix typo in comment explaining rb_tree usage Remove fs/ntfs/ChangeLog doc: fix console doc typo doc: cpuset: Update the cpuset flag file Fix of spelling in arch/sparc/kernel/leon_kernel.c no longer needed Remove drivers/parport/ChangeLog Remove drivers/char/ChangeLog doc: typo - Table 1-2 should refer to "status", not "statm" tree-wide: fix typos "ass?o[sc]iac?te" -> "associate" in comments No need to patch AMD-provided drivers/gpu/drm/radeon/atombios.h devres/irq: Fix devm_irq_match comment Remove reference to kthread_create_on_cpu tree-wide: Assorted spelling fixes tree-wide: fix 'lenght' typo in comments and code drm/kms: fix spelling in error message doc: capitalization and other minor fixes in pnp doc devres: typo fix s/dev/devm/ Remove redundant trailing semicolons from macros fix typo "definetly" -> "definitely" in comment tree-wide: s/widht/width/g typo in comments ... Fix trivial conflict in Documentation/laptops/00-INDEX
| * Merge branch 'for-next' into for-linusJiri Kosina2010-03-081-3/+3
| |\ | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: Documentation/filesystems/proc.txt arch/arm/mach-u300/include/mach/debug-macro.S drivers/net/qlge/qlge_ethtool.c drivers/net/qlge/qlge_main.c drivers/net/typhoon.c
| | * Remove redundant trailing semicolons from macrosEdward Z. Yang2010-02-051-3/+3
| | | | | | | | | | | | | | | | | | Signed-off-by: Edward Z. Yang <ezyang@ksplice.com> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | | sysfs: Use sysfs_attr_init and sysfs_bin_attr_init on dynamic attributesEric W. Biederman2010-03-071-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | These are the non-static sysfs attributes that exist on my test machine. Fix them to use sysfs_attr_init or sysfs_bin_attr_init as appropriate. It simply requires making a sysfs attribute present to see this. So this is a little bit tedious but otherwise not too bad. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: WANG Cong <xiyou.wangcong@gmail.com> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | | Driver core: Constify struct sysfs_ops in struct kobj_typeEmese Revfy2010-03-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Constify struct sysfs_ops. This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy <re.emese@gmail.com> Acked-by: David Teigland <teigland@redhat.com> Acked-by: Matt Domsch <Matt_Domsch@dell.com> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Acked-by: Hans J. Koch <hjk@linutronix.de> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Jens Axboe <jens.axboe@oracle.com> Acked-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* | | kobject: Constify struct kset_uevent_opsEmese Revfy2010-03-071-1/+1
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Constify struct kset_uevent_ops. This is part of the ops structure constification effort started by Arjan van de Ven et al. Benefits of this constification: * prevents modification of data that is shared (referenced) by many other structure instances at runtime * detects/prevents accidental (but not intentional) modification attempts on archs that enforce read-only kernel data at runtime * potentially better optimized code as the compiler can assume that the const data cannot be changed * the compiler/linker move const data into .rodata and therefore exclude them from false sharing Signed-off-by: Emese Revfy <re.emese@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
* / includecheck fix for kernel/params.cJaswinder Singh Rajput2010-03-061-1/+0
|/ | | | | | | | | | Fix the following 'make includecheck' warning: kernel/params.c: linux/string.h is included more than once. Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Cc: André Goddard Rosa <andre.goddard@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* tree-wide: convert open calls to remove spaces to skip_spaces() lib functionAndré Goddard Rosa2009-12-151-5/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Makes use of skip_spaces() defined in lib/string.c for removing leading spaces from strings all over the tree. It decreases lib.a code size by 47 bytes and reuses the function tree-wide: text data bss dec hex filename 64688 584 592 65864 10148 (TOTALS-BEFORE) 64641 584 592 65817 10119 (TOTALS-AFTER) Also, while at it, if we see (*str && isspace(*str)), we can be sure to remove the first condition (*str) as the second one (isspace(*str)) also evaluates to 0 whenever *str == 0, making it redundant. In other words, "a char equals zero is never a space". Julia Lawall tried the semantic patch (http://coccinelle.lip6.fr) below, and found occurrences of this pattern on 3 more files: drivers/leds/led-class.c drivers/leds/ledtrig-timer.c drivers/video/output.c @@ expression str; @@ ( // ignore skip_spaces cases while (*str && isspace(*str)) { \(str++;\|++str;\) } | - *str && isspace(*str) ) Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com> Cc: Julia Lawall <julia@diku.dk> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Neil Brown <neilb@suse.de> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: David Howells <dhowells@redhat.com> Cc: <linux-ext4@vger.kernel.org> Cc: Samuel Ortiz <samuel@sortiz.org> Cc: Patrick McHardy <kaber@trash.net> Cc: Takashi Iwai <tiwai@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* param: fix setting arrays of boolRusty Russell2009-10-291-1/+4
| | | | | | | | | | | We create a dummy struct kernel_param on the stack for parsing each array element, but we didn't initialize the flags word. This matters for arrays of type "bool", where the flag indicates if it really is an array of bools or unsigned int (old-style). Reported-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: stable@kernel.org
* param: fix NULL comparison on oomRusty Russell2009-10-291-1/+1
| | | | | | | | kp->arg is always true: it's the contents of that pointer we care about. Reported-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: stable@kernel.org
* param: fix lots of bugs with writing charp params from sysfs, by leaking mem.Rusty Russell2009-10-291-9/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | e180a6b7759a "param: fix charp parameters set via sysfs" fixed the case where charp parameters written via sysfs were freed, leaving drivers accessing random memory. Unfortunately, storing a flag in the kparam struct was a bad idea: it's rodata so setting it causes an oops on some archs. But that's not all: 1) module_param_array() on charp doesn't work reliably, since we use an uninitialized temporary struct kernel_param. 2) there's a fundamental race if a module uses this parameter and then it's changed: they will still access the old, freed, memory. The simplest fix (ie. for 2.6.32) is to never free the memory. This prevents all these problems, at cost of a memory leak. In practice, there are only 18 places where a charp is writable via sysfs, and all are root-only writable. Reported-by: Takashi Iwai <tiwai@suse.de> Cc: Sitsofe Wheeler <sitsofe@yahoo.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: stable@kernel.org
* param: allow whitespace as kernel parameter separatorPeter Oberparleiter2009-09-251-3/+4
| | | | | | | | | | | | | | | | Some boot mechanisms require that kernel parameters are stored in a separate file which is loaded to memory without further processing (e.g. the "Load from FTP" method on s390). When such a file contains newline characters, the kernel parameter preceding the newline might not be correctly parsed (due to the newline being stuck to the end of the actual parameter value) which can lead to boot failures. This patch improves kernel command line usability in such a situation by allowing generic whitespace characters as separators between kernel parameters. Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module_param: allow 'bool' module_params to be bool, not just int.Rusty Russell2009-06-121-7/+26
| | | | | | | | | | | Impact: API cleanup For historical reasons, 'bool' parameters must be an int, not a bool. But there are around 600 users, so a conversion seems like useless churn. So we use __same_type() to distinguish, and handle both cases. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module_param: split perm field into flags and permRusty Russell2009-06-121-6/+3
| | | | | | | | | Impact: cleanup Rather than hack KPARAM_KMALLOCED into the perm field, separate it out. Since the perm field was 32 bits and only needs 16, we don't add bloat. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* module_param: invbool should take a 'bool', not an 'int'Rusty Russell2009-06-121-2/+2
| | | | | | | | | | | | It takes an 'int' for historical reasons, and there are only two users: simply switch it over to bool. The other user (uvesafb.c) will get a (harmless-on-x86) warning until the next patch is applied. Cc: Brad Douglas <brad@neruo.com> Cc: Michal Januszewski <spock@gentoo.org> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* param: fix charp parameters set via sysfsRusty Russell2009-03-311-1/+25
| | | | | | | | | | | | | | | | | | | | | | | Impact: fix crash on reading from /sys/module/.../ieee80211_default_rc_algo The module_param type "charp" simply sets a char * pointer in the module to the parameter in the commandline string: this is why we keep the (mangled) module command line around. But when set via sysfs (as about 11 charp parameters can be) this memory is freed on the way out of the write(). Future reads hit random mem. So we kstrdup instead: we have to check we're not in early commandline parsing, and we have to note when we've used it so we can reliably kfree the parameter when it's next overwritten, and also on module unload. (Thanks to Randy Dunlap for CONFIG_SYSFS=n fixes) Reported-by: Sitsofe Wheeler <sitsofe@yahoo.com> Diagnosed-by: Frederic Weisbecker <fweisbec@gmail.com> Tested-by: Frederic Weisbecker <fweisbec@gmail.com> Tested-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Fix compile warning in kernel/params.cLinus Torvalds2008-10-231-1/+1
| | | | | | | | | Move free_module_param_attrs() into the CONFIG_MODULES section, since it's only used inside there. Thus avoiding the warning kernel/params.c:514: warning: 'free_module_param_attrs' defined but not used Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* core_param() for genuinely core kernel parametersRusty Russell2008-10-221-7/+7
| | | | | | | | | | | | | | | There are a lot of one-liner uses of __setup() in the kernel: they're cumbersome and not queryable (definitely not settable) via /sys. Yet it's ugly to simplify them to module_param(), because by default that inserts a prefix of the module name (usually filename). So, introduce a "core_param". The parameter gets no prefix, but appears in /sys/module/kernel/parameters/ (if non-zero perms arg). I thought about using the name "core", but that's more common than "kernel". And if you create a module called "kernel", you will die a horrible death. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* param: Fix duplicate module prefixesRusty Russell2008-10-221-120/+141
| | | | | | | | | | | | | | | | | Instead of insisting each new module_param sysfs entry is unique, handle the case where it already exists (for builtin modules). The current code assumes that all identical prefixes are together in the section: true for normal uses, but not necessarily so if someone overrides MODULE_PARAM_PREFIX. More importantly, it's not true with the new "core_param()" code which uses "kernel" as a prefix. This simplifies the caller for the builtin case, at a slight loss of efficiency (we do the lookup every time to see if the directory exists). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Greg Kroah-Hartman <gregkh@suse.de>
* module: check kernel param length at compile time, not runtimeRusty Russell2008-10-221-5/+2
| | | | | | | | | | | The kparam code tries to handle over-length parameter prefixes at runtime. Not only would I bet this has never been tested, it's not clear that truncating names is a good idea either. So let's check at compile time. We need to move the #define to moduleparam.h to do this, though. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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