Hi Jason, [auto build test WARNING on linus/master] [also build test WARNING on v4.12-rc4] [cannot apply to next-20170607] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Jason-A-Donenfeld/Unseeded-In-Kernel-Randomness-Fixes/20170606-171249 config: sh-ul2_defconfig (attached as .config) compiler: sh4-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=sh 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 include/linux/spinlock.h:53:0, from include/linux/rcupdate.h:38, from include/linux/rculist.h:10, from include/linux/pid.h:4, from include/linux/sched.h:13, from include/linux/utsname.h:5, from drivers//char/random.c:238: drivers//char/random.c: In function 'get_random_u64': >> include/linux/irqflags.h:69:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ drivers//char/random.c:2063:16: note: 'flags' was declared here unsigned long flags; ^~~~~ In file included from include/linux/spinlock.h:53:0, from include/linux/rcupdate.h:38, from include/linux/rculist.h:10, from include/linux/pid.h:4, from include/linux/sched.h:13, from include/linux/utsname.h:5, from drivers//char/random.c:238: drivers//char/random.c: In function 'get_random_u32': >> include/linux/irqflags.h:69:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ drivers//char/random.c:2095:16: note: 'flags' was declared here unsigned long flags; ^~~~~ -- In file included from include/linux/spinlock.h:53:0, from include/linux/rcupdate.h:38, from include/linux/rculist.h:10, from include/linux/pid.h:4, from include/linux/sched.h:13, from include/linux/utsname.h:5, from drivers/char/random.c:238: drivers/char/random.c: In function 'get_random_u64': >> include/linux/irqflags.h:69:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ drivers/char/random.c:2063:16: note: 'flags' was declared here unsigned long flags; ^~~~~ In file included from include/linux/spinlock.h:53:0, from include/linux/rcupdate.h:38, from include/linux/rculist.h:10, from include/linux/pid.h:4, from include/linux/sched.h:13, from include/linux/utsname.h:5, from drivers/char/random.c:238: drivers/char/random.c: In function 'get_random_u32': >> include/linux/irqflags.h:69:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ drivers/char/random.c:2095:16: note: 'flags' was declared here unsigned long flags; ^~~~~ vim +/flags +69 include/linux/irqflags.h 81d68a96a Steven Rostedt 2008-05-12 53 # define start_critical_timings() do { } while (0) 81d68a96a Steven Rostedt 2008-05-12 54 #endif 81d68a96a Steven Rostedt 2008-05-12 55 df9ee2927 David Howells 2010-10-07 56 /* df9ee2927 David Howells 2010-10-07 57 * Wrap the arch provided IRQ routines to provide appropriate checks. df9ee2927 David Howells 2010-10-07 58 */ df9ee2927 David Howells 2010-10-07 59 #define raw_local_irq_disable() arch_local_irq_disable() df9ee2927 David Howells 2010-10-07 60 #define raw_local_irq_enable() arch_local_irq_enable() df9ee2927 David Howells 2010-10-07 61 #define raw_local_irq_save(flags) \ df9ee2927 David Howells 2010-10-07 62 do { \ df9ee2927 David Howells 2010-10-07 63 typecheck(unsigned long, flags); \ df9ee2927 David Howells 2010-10-07 64 flags = arch_local_irq_save(); \ df9ee2927 David Howells 2010-10-07 65 } while (0) df9ee2927 David Howells 2010-10-07 66 #define raw_local_irq_restore(flags) \ df9ee2927 David Howells 2010-10-07 67 do { \ df9ee2927 David Howells 2010-10-07 68 typecheck(unsigned long, flags); \ df9ee2927 David Howells 2010-10-07 @69 arch_local_irq_restore(flags); \ df9ee2927 David Howells 2010-10-07 70 } while (0) df9ee2927 David Howells 2010-10-07 71 #define raw_local_save_flags(flags) \ df9ee2927 David Howells 2010-10-07 72 do { \ df9ee2927 David Howells 2010-10-07 73 typecheck(unsigned long, flags); \ df9ee2927 David Howells 2010-10-07 74 flags = arch_local_save_flags(); \ df9ee2927 David Howells 2010-10-07 75 } while (0) df9ee2927 David Howells 2010-10-07 76 #define raw_irqs_disabled_flags(flags) \ df9ee2927 David Howells 2010-10-07 77 ({ \ :::::: The code at line 69 was first introduced by commit :::::: df9ee29270c11dba7d0fe0b83ce47a4d8e8d2101 Fix IRQ flag handling naming :::::: TO: David Howells <dhowells@xxxxxxxxxx> :::::: CC: David Howells <dhowells@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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