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Message-ID: <202410131151.SBnGQot0-lkp@intel.com>
Date: Sun, 13 Oct 2024 12:01:24 +0800
From: kernel test robot <lkp@...el.com>
To: Przemek Kitszel <przemyslaw.kitszel@...el.com>,
linux-kernel@...r.kernel.org, Peter Zijlstra <peterz@...radead.org>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
amadeuszx.slawinski@...ux.intel.com,
Tony Nguyen <anthony.l.nguyen@...el.com>,
nex.sw.ncis.osdt.itp.upstreaming@...el.com, netdev@...r.kernel.org,
Markus Elfring <Markus.Elfring@....de>,
Kees Cook <keescook@...omium.org>,
Przemek Kitszel <przemyslaw.kitszel@...el.com>,
David Lechner <dlechner@...libre.com>,
Dan Carpenter <error27@...il.com>,
Andy Shevchenko <andriy.shevchenko@...el.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>
Subject: Re: [PATCH v3] cleanup: adjust scoped_guard() macros to avoid
potential warning
Hi Przemek,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 44badc908f2c85711cb18e45e13119c10ad3a05f]
url: https://github.com/intel-lab-lkp/linux/commits/Przemek-Kitszel/cleanup-adjust-scoped_guard-macros-to-avoid-potential-warning/20241011-201702
base: 44badc908f2c85711cb18e45e13119c10ad3a05f
patch link: https://lore.kernel.org/r/20241011121535.28049-1-przemyslaw.kitszel%40intel.com
patch subject: [PATCH v3] cleanup: adjust scoped_guard() macros to avoid potential warning
config: i386-buildonly-randconfig-005-20241013 (https://download.01.org/0day-ci/archive/20241013/202410131151.SBnGQot0-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241013/202410131151.SBnGQot0-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410131151.SBnGQot0-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> drivers/firewire/core-device.c:1041:2: warning: variable 'found' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
1041 | scoped_guard(rwsem_read, &fw_device_rwsem) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/firewire/core-device.c:1045:6: note: uninitialized use occurs here
1045 | if (found) {
| ^~~~~
include/linux/compiler.h:55:47: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~
include/linux/compiler.h:57:52: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
drivers/firewire/core-device.c:1041:2: note: remove the 'if' if its condition is always false
1041 | scoped_guard(rwsem_read, &fw_device_rwsem) {
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/firewire/core-device.c:1008:22: note: initialize the variable 'found' to silence this warning
1008 | struct device *found;
| ^
| = NULL
1 warning generated.
--
>> drivers/firewire/core-transaction.c:912:2: warning: variable 'handler' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
912 | scoped_guard(rcu) {
| ^~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/firewire/core-transaction.c:921:7: note: uninitialized use occurs here
921 | if (!handler)
| ^~~~~~~
include/linux/compiler.h:55:47: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~
include/linux/compiler.h:57:52: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
drivers/firewire/core-transaction.c:912:2: note: remove the 'if' if its condition is always false
912 | scoped_guard(rcu) {
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/firewire/core-transaction.c:903:36: note: initialize the variable 'handler' to silence this warning
903 | struct fw_address_handler *handler;
| ^
| = NULL
1 warning generated.
--
>> drivers/firewire/core-cdev.c:508:2: warning: variable 'ret' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
508 | scoped_guard(spinlock_irqsave, &client->lock) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/firewire/core-cdev.c:530:9: note: uninitialized use occurs here
530 | return ret < 0 ? ret : 0;
| ^~~
drivers/firewire/core-cdev.c:508:2: note: remove the 'if' if its condition is always false
508 | scoped_guard(spinlock_irqsave, &client->lock) {
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/firewire/core-cdev.c:506:9: note: initialize the variable 'ret' to silence this warning
506 | int ret;
| ^
| = 0
>> drivers/firewire/core-cdev.c:1327:2: warning: variable 'skip' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
1327 | scoped_guard(spinlock_irq, &client->lock) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/firewire/core-cdev.c:1346:6: note: uninitialized use occurs here
1346 | if (skip)
| ^~~~
include/linux/compiler.h:55:47: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~
include/linux/compiler.h:57:52: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~
drivers/firewire/core-cdev.c:1327:2: note: remove the 'if' if its condition is always false
1327 | scoped_guard(spinlock_irq, &client->lock) {
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/firewire/core-cdev.c:1325:11: note: initialize the variable 'skip' to silence this warning
1325 | bool skip, free, success;
| ^
| = 0
2 warnings generated.
--
>> drivers/gpio/gpio-sim.c:179:2: warning: variable 'direction' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
179 | scoped_guard(mutex, &chip->lock)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpio/gpio-sim.c:182:9: note: uninitialized use occurs here
182 | return direction ? GPIO_LINE_DIRECTION_IN : GPIO_LINE_DIRECTION_OUT;
| ^~~~~~~~~
drivers/gpio/gpio-sim.c:179:2: note: remove the 'if' if its condition is always false
179 | scoped_guard(mutex, &chip->lock)
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/gpio/gpio-sim.c:177:15: note: initialize the variable 'direction' to silence this warning
177 | int direction;
| ^
| = 0
>> drivers/gpio/gpio-sim.c:277:2: warning: variable 'val' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
277 | scoped_guard(mutex, &chip->lock)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpio/gpio-sim.c:280:33: note: uninitialized use occurs here
280 | return sysfs_emit(buf, "%d\n", val);
| ^~~
drivers/gpio/gpio-sim.c:277:2: note: remove the 'if' if its condition is always false
277 | scoped_guard(mutex, &chip->lock)
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/gpio/gpio-sim.c:275:9: note: initialize the variable 'val' to silence this warning
275 | int val;
| ^
| = 0
>> drivers/gpio/gpio-sim.c:307:2: warning: variable 'pull' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
307 | scoped_guard(mutex, &chip->lock)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpio/gpio-sim.c:310:61: note: uninitialized use occurs here
310 | return sysfs_emit(buf, "%s\n", gpio_sim_sysfs_pull_strings[pull]);
| ^~~~
drivers/gpio/gpio-sim.c:307:2: note: remove the 'if' if its condition is always false
307 | scoped_guard(mutex, &chip->lock)
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/gpio/gpio-sim.c:305:10: note: initialize the variable 'pull' to silence this warning
305 | int pull;
| ^
| = 0
>> drivers/gpio/gpio-sim.c:756:2: warning: variable 'live' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
756 | scoped_guard(mutex, &dev->lock)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpio/gpio-sim.c:759:31: note: uninitialized use occurs here
759 | return sprintf(page, "%c\n", live ? '1' : '0');
| ^~~~
drivers/gpio/gpio-sim.c:756:2: note: remove the 'if' if its condition is always false
756 | scoped_guard(mutex, &dev->lock)
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/gpio/gpio-sim.c:754:11: note: initialize the variable 'live' to silence this warning
754 | bool live;
| ^
| = 0
>> drivers/gpio/gpio-sim.c:1266:2: warning: variable 'dir' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
1266 | scoped_guard(mutex, &dev->lock)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:55:28: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:57:30: note: expanded from macro '__trace_if_var'
57 | #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpio/gpio-sim.c:1269:10: note: uninitialized use occurs here
1269 | switch (dir) {
| ^~~
drivers/gpio/gpio-sim.c:1266:2: note: remove the 'if' if its condition is always false
1266 | scoped_guard(mutex, &dev->lock)
| ^
include/linux/cleanup.h:197:2: note: expanded from macro 'scoped_guard'
197 | __scoped_guard(_name, /* empty */, __UNIQUE_ID(label), args)
| ^
include/linux/cleanup.h:190:3: note: expanded from macro '__scoped_guard'
190 | if (!__guard_ptr(_name)(&scope) && __is_cond_ptr(_name)) { \
| ^
include/linux/compiler.h:55:23: note: expanded from macro 'if'
55 | #define if(cond, ...) if ( __trace_if_var( !!(cond , ## __VA_ARGS__) ) )
| ^
drivers/gpio/gpio-sim.c:1264:9: note: initialize the variable 'dir' to silence this warning
1264 | int dir;
| ^
| = 0
5 warnings generated.
..
vim +1041 drivers/firewire/core-device.c
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1002
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1003 static void fw_device_init(struct work_struct *work)
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1004 {
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1005 struct fw_device *device =
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1006 container_of(work, struct fw_device, work.work);
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1007 struct fw_card *card = device->card;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1008 struct device *found;
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1009 u32 minor;
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1010 int ret;
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1011
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1012 /*
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1013 * All failure paths here set node->data to NULL, so that we
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1014 * don't try to do device_for_each_child() on a kfree()'d
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1015 * device.
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1016 */
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1017
94fba9fbeac444 drivers/firewire/core-device.c Clemens Ladisch 2012-04-11 1018 ret = read_config_rom(device, device->generation);
94fba9fbeac444 drivers/firewire/core-device.c Clemens Ladisch 2012-04-11 1019 if (ret != RCODE_COMPLETE) {
855c603d61ede7 drivers/firewire/fw-device.c Stefan Richter 2008-02-27 1020 if (device->config_rom_retries < MAX_RETRIES &&
855c603d61ede7 drivers/firewire/fw-device.c Stefan Richter 2008-02-27 1021 atomic_read(&device->state) == FW_DEVICE_INITIALIZING) {
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1022 device->config_rom_retries++;
6ea9e7bbfc389a drivers/firewire/core-device.c Stefan Richter 2010-10-13 1023 fw_schedule_device_work(device, RETRY_DELAY);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1024 } else {
115881d395959b drivers/firewire/core-device.c Stefan Richter 2011-03-15 1025 if (device->node->link_on)
94fba9fbeac444 drivers/firewire/core-device.c Clemens Ladisch 2012-04-11 1026 fw_notice(card, "giving up on node %x: reading config rom failed: %s\n",
94fba9fbeac444 drivers/firewire/core-device.c Clemens Ladisch 2012-04-11 1027 device->node_id,
94fba9fbeac444 drivers/firewire/core-device.c Clemens Ladisch 2012-04-11 1028 fw_rcode_string(ret));
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1029 if (device->node == card->root_node)
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1030 fw_schedule_bm_work(card, 0);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1031 fw_device_release(&device->device);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1032 }
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1033 return;
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1034 }
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1035
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1036 // If a device was pending for deletion because its node went away but its bus info block
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1037 // and root directory header matches that of a newly discovered device, revive the
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1038 // existing fw_device. The newly allocated fw_device becomes obsolete instead.
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1039 //
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1040 // serialize config_rom access.
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 @1041 scoped_guard(rwsem_read, &fw_device_rwsem) {
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1042 found = device_find_child(card->device, (void *)device->config_rom,
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1043 compare_configuration_rom);
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1044 }
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1045 if (found) {
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1046 struct fw_device *reused = fw_device(found);
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1047
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1048 if (atomic_cmpxchg(&reused->state,
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1049 FW_DEVICE_GONE,
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1050 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1051 // serialize node access
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1052 scoped_guard(spinlock_irq, &card->lock) {
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1053 struct fw_node *current_node = device->node;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1054 struct fw_node *obsolete_node = reused->node;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1055
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1056 device->node = obsolete_node;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1057 device->node->data = device;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1058 reused->node = current_node;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1059 reused->node->data = reused;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1060
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1061 reused->max_speed = device->max_speed;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1062 reused->node_id = current_node->node_id;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1063 smp_wmb(); /* update node_id before generation */
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1064 reused->generation = card->generation;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1065 reused->config_rom_retries = 0;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1066 fw_notice(card, "rediscovered device %s\n",
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1067 dev_name(found));
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1068
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1069 reused->workfn = fw_device_update;
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1070 fw_schedule_device_work(reused, 0);
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1071
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1072 if (current_node == card->root_node)
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1073 fw_schedule_bm_work(card, 0);
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1074 }
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1075
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1076 put_device(found);
3d36a0df3b473f drivers/firewire/fw-device.c Stefan Richter 2009-01-17 1077 fw_device_release(&device->device);
3d36a0df3b473f drivers/firewire/fw-device.c Stefan Richter 2009-01-17 1078
3d36a0df3b473f drivers/firewire/fw-device.c Stefan Richter 2009-01-17 1079 return;
3d36a0df3b473f drivers/firewire/fw-device.c Stefan Richter 2009-01-17 1080 }
3d36a0df3b473f drivers/firewire/fw-device.c Stefan Richter 2009-01-17 1081
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1082 put_device(found);
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1083 }
e2c87f484190b1 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-20 1084
6230582320b721 drivers/firewire/fw-device.c Stefan Richter 2009-01-09 1085 device_initialize(&device->device);
96b19062e741b7 drivers/firewire/fw-device.c Stefan Richter 2008-02-02 1086
96b19062e741b7 drivers/firewire/fw-device.c Stefan Richter 2008-02-02 1087 fw_device_get(device);
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1088
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1089 // The index of allocated entry is used for minor identifier of device node.
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1090 ret = xa_alloc(&fw_device_xa, &minor, device, XA_LIMIT(0, MINORMASK), GFP_KERNEL);
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1091 if (ret < 0)
a3aca3dabbcf00 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-07 1092 goto error;
a3aca3dabbcf00 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-07 1093
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1094 device->device.bus = &fw_bus_type;
21351dbe4e6127 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-20 1095 device->device.type = &fw_device_type;
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1096 device->device.parent = card->device;
a3aca3dabbcf00 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-07 1097 device->device.devt = MKDEV(fw_cdev_major, minor);
a1f64819fe9f13 drivers/firewire/fw-device.c Kay Sievers 2008-10-30 1098 dev_set_name(&device->device, "fw%d", minor);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1099
e5333db9285e08 drivers/firewire/fw-device.c Stefan Richter 2009-05-22 1100 BUILD_BUG_ON(ARRAY_SIZE(device->attribute_group.attrs) <
e5333db9285e08 drivers/firewire/fw-device.c Stefan Richter 2009-05-22 1101 ARRAY_SIZE(fw_device_attributes) +
e5333db9285e08 drivers/firewire/fw-device.c Stefan Richter 2009-05-22 1102 ARRAY_SIZE(config_rom_attributes));
6f2e53d5135a86 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-27 1103 init_fw_attribute_group(&device->device,
6f2e53d5135a86 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-27 1104 fw_device_attributes,
6f2e53d5135a86 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-27 1105 &device->attribute_group);
e5333db9285e08 drivers/firewire/fw-device.c Stefan Richter 2009-05-22 1106
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1107 if (device_add(&device->device)) {
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1108 fw_err(card, "failed to add device\n");
a3aca3dabbcf00 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-07 1109 goto error_with_cdev;
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1110 }
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1111
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1112 create_units(device);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1113
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1114 /*
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1115 * Transition the device to running state. If it got pulled
183b8021fc0a5f drivers/firewire/core-device.c Masahiro Yamada 2017-02-27 1116 * out from under us while we did the initialization work, we
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1117 * have to shut down the device again here. Normally, though,
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1118 * fw_node_event will be responsible for shutting it down when
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1119 * necessary. We have to use the atomic cmpxchg here to avoid
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1120 * racing with the FW_NODE_DESTROYED case in
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1121 * fw_node_event().
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1122 */
641f8791f031d6 drivers/firewire/fw-device.c Stefan Richter 2007-01-27 1123 if (atomic_cmpxchg(&device->state,
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1124 FW_DEVICE_INITIALIZING,
3d36a0df3b473f drivers/firewire/fw-device.c Stefan Richter 2009-01-17 1125 FW_DEVICE_RUNNING) == FW_DEVICE_GONE) {
70044d71d31d69 drivers/firewire/core-device.c Tejun Heo 2014-03-07 1126 device->workfn = fw_device_shutdown;
6ea9e7bbfc389a drivers/firewire/core-device.c Stefan Richter 2010-10-13 1127 fw_schedule_device_work(device, SHUTDOWN_DELAY);
fa6e697b85d705 drivers/firewire/fw-device.c Stefan Richter 2008-02-03 1128 } else {
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1129 fw_notice(card, "created device %s: GUID %08x%08x, S%d00\n",
a1f64819fe9f13 drivers/firewire/fw-device.c Kay Sievers 2008-10-30 1130 dev_name(&device->device),
fa6e697b85d705 drivers/firewire/fw-device.c Stefan Richter 2008-02-03 1131 device->config_rom[3], device->config_rom[4],
f1397490017e33 drivers/firewire/fw-device.c Stefan Richter 2007-06-10 1132 1 << device->max_speed);
c9755e14a01987 drivers/firewire/fw-device.c Stefan Richter 2008-03-24 1133 device->config_rom_retries = 0;
7889b60ee71eaf drivers/firewire/fw-device.c Stefan Richter 2009-03-10 1134
099d54143e49d4 drivers/firewire/core-device.c Stefan Richter 2009-06-06 1135 set_broadcast_channel(device, device->generation);
badfcb24891ccd drivers/firewire/core-device.c Clemens Ladisch 2012-08-13 1136
badfcb24891ccd drivers/firewire/core-device.c Clemens Ladisch 2012-08-13 1137 add_device_randomness(&device->config_rom[3], 8);
fa6e697b85d705 drivers/firewire/fw-device.c Stefan Richter 2008-02-03 1138 }
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1139
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1140 /*
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1141 * Reschedule the IRM work if we just finished reading the
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1142 * root node config rom. If this races with a bus reset we
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1143 * just end up running the IRM work a couple of extra times -
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1144 * pretty harmless.
c781c06d119d04 drivers/firewire/fw-device.c Kristian Høgsberg 2007-05-07 1145 */
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1146 if (device->node == card->root_node)
26b4950de174bc drivers/firewire/core-device.c Stefan Richter 2012-02-18 1147 fw_schedule_bm_work(card, 0);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1148
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1149 return;
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1150
a3aca3dabbcf00 drivers/firewire/fw-device.c Kristian Høgsberg 2007-03-07 1151 error_with_cdev:
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1152 xa_erase(&fw_device_xa, minor);
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1153 error:
7e5a7725a0e403 drivers/firewire/core-device.c Takashi Sakamoto 2024-08-12 1154 fw_device_put(device); // fw_device_xa's reference.
96b19062e741b7 drivers/firewire/fw-device.c Stefan Richter 2008-02-02 1155
96b19062e741b7 drivers/firewire/fw-device.c Stefan Richter 2008-02-02 1156 put_device(&device->device); /* our reference */
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1157 }
19a15b937b2663 drivers/firewire/fw-device.c Kristian Høgsberg 2006-12-19 1158
--
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