* [rcu:test 69/69] arch/arm/include/asm/irqflags.h:171:2: warning: 'flags' may be used uninitialized in this function
@ 2019-05-31 17:10 kbuild test robot
0 siblings, 0 replies; only message in thread
From: kbuild test robot @ 2019-05-31 17:10 UTC (permalink / raw)
To: Paul E. McKenney; +Cc: kbuild-all, linux-kernel
[-- Attachment #1: Type: text/plain, Size: 4729 bytes --]
tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git test
head: 685a26bc60076305987bf06cfd1269e5e4094c73
commit: 685a26bc60076305987bf06cfd1269e5e4094c73 [69/69] rcu/nocb: Avoid ->nocb_lock capture by corresponding CPU
config: arm-realview_defconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 7.4.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
git checkout 685a26bc60076305987bf06cfd1269e5e4094c73
# save the attached .config to linux build tree
GCC_VERSION=7.4.0 make.cross ARCH=arm
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
In file included from kernel/rcu/tree.c:3519:0:
kernel/rcu/tree_plugin.h: In function 'do_nocb_deferred_wakeup_common':
kernel/rcu/tree_plugin.h:1891:2: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
wake_nocb_gp(rdp, ndw == RCU_NOCB_WAKE_FORCE, flags);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/irqflags.h:16:0,
from arch/arm/include/asm/bitops.h:28,
from include/linux/bitops.h:19,
from include/linux/kernel.h:12,
from kernel/rcu/tree.c:21:
kernel/rcu/tree_plugin.h: In function 'rcu_nocb_gp_kthread':
>> arch/arm/include/asm/irqflags.h:171:2: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
asm volatile(
^~~
In file included from kernel/rcu/tree.c:3519:0:
kernel/rcu/tree_plugin.h:1719:16: note: 'flags' was declared here
unsigned long flags;
^~~~~
--
In file included from kernel//rcu/tree.c:3519:0:
kernel//rcu/tree_plugin.h: In function 'do_nocb_deferred_wakeup_common':
kernel//rcu/tree_plugin.h:1891:2: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
wake_nocb_gp(rdp, ndw == RCU_NOCB_WAKE_FORCE, flags);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/irqflags.h:16:0,
from arch/arm/include/asm/bitops.h:28,
from include/linux/bitops.h:19,
from include/linux/kernel.h:12,
from kernel//rcu/tree.c:21:
kernel//rcu/tree_plugin.h: In function 'rcu_nocb_gp_kthread':
>> arch/arm/include/asm/irqflags.h:171:2: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
asm volatile(
^~~
In file included from kernel//rcu/tree.c:3519:0:
kernel//rcu/tree_plugin.h:1719:16: note: 'flags' was declared here
unsigned long flags;
^~~~~
vim +/flags +171 arch/arm/include/asm/irqflags.h
7ad1bcb2 include/asm-arm/irqflags.h Russell King 2006-08-27 164
7ad1bcb2 include/asm-arm/irqflags.h Russell King 2006-08-27 165 /*
7ad1bcb2 include/asm-arm/irqflags.h Russell King 2006-08-27 166 * restore saved IRQ & FIQ state
7ad1bcb2 include/asm-arm/irqflags.h Russell King 2006-08-27 167 */
6fb18ac9 arch/arm/include/asm/irqflags.h Daniel Thompson 2015-06-10 168 #define arch_local_irq_restore arch_local_irq_restore
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 169 static inline void arch_local_irq_restore(unsigned long flags)
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 170 {
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 @171 asm volatile(
55bdd694 arch/arm/include/asm/irqflags.h Catalin Marinas 2010-05-21 172 " msr " IRQMASK_REG_NAME_W ", %0 @ local_irq_restore"
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 173 :
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 174 : "r" (flags)
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 175 : "memory", "cc");
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 176 }
df9ee292 arch/arm/include/asm/irqflags.h David Howells 2010-10-07 177
:::::: The code at line 171 was first introduced by commit
:::::: df9ee29270c11dba7d0fe0b83ce47a4d8e8d2101 Fix IRQ flag handling naming
:::::: TO: David Howells <dhowells@redhat.com>
:::::: CC: David Howells <dhowells@redhat.com>
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 19777 bytes --]
^ permalink raw reply [flat|nested] only message in thread
only message in thread, other threads:[~2019-05-31 17:10 UTC | newest]
Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-31 17:10 [rcu:test 69/69] arch/arm/include/asm/irqflags.h:171:2: warning: 'flags' may be used uninitialized in this function kbuild test robot
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.