Hi Greg, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v4.16] [cannot apply to next-20180406] [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/Greg-Thelen/writeback-safer-lock-nesting/20180407-122200 config: mips-db1xxx_defconfig (attached as .config) compiler: mipsel-linux-gnu-gcc (Debian 7.2.0-11) 7.2.0 reproduce: wget https://raw.githubusercontent.com/intel/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=mips 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 arch/mips/include/asm/atomic.h:17:0, from include/linux/atomic.h:5, from arch/mips/include/asm/processor.h:14, from arch/mips/include/asm/thread_info.h:16, from include/linux/thread_info.h:38, from include/asm-generic/preempt.h:5, from ./arch/mips/include/generated/asm/preempt.h:1, from include/linux/preempt.h:81, from include/linux/spinlock.h:51, from mm/page-writeback.c:16: mm/page-writeback.c: In function 'account_page_redirty': >> include/linux/irqflags.h:80:3: warning: 'cookie.flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ mm/page-writeback.c:2504:25: note: 'cookie.flags' was declared here struct wb_lock_cookie cookie; ^~~~~~ In file included from arch/mips/include/asm/atomic.h:17:0, from include/linux/atomic.h:5, from arch/mips/include/asm/processor.h:14, from arch/mips/include/asm/thread_info.h:16, from include/linux/thread_info.h:38, from include/asm-generic/preempt.h:5, from ./arch/mips/include/generated/asm/preempt.h:1, from include/linux/preempt.h:81, from include/linux/spinlock.h:51, from mm/page-writeback.c:16: mm/page-writeback.c: In function '__cancel_dirty_page': >> include/linux/irqflags.h:80:3: warning: 'cookie.flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ mm/page-writeback.c:2616:25: note: 'cookie.flags' was declared here struct wb_lock_cookie cookie; ^~~~~~ In file included from arch/mips/include/asm/atomic.h:17:0, from include/linux/atomic.h:5, from arch/mips/include/asm/processor.h:14, from arch/mips/include/asm/thread_info.h:16, from include/linux/thread_info.h:38, from include/asm-generic/preempt.h:5, from ./arch/mips/include/generated/asm/preempt.h:1, from include/linux/preempt.h:81, from include/linux/spinlock.h:51, from mm/page-writeback.c:16: mm/page-writeback.c: In function 'clear_page_dirty_for_io': >> include/linux/irqflags.h:80:3: warning: 'cookie.flags' may be used uninitialized in this function [-Wmaybe-uninitialized] arch_local_irq_restore(flags); \ ^~~~~~~~~~~~~~~~~~~~~~ mm/page-writeback.c:2656:25: note: 'cookie.flags' was declared here struct wb_lock_cookie cookie; ^~~~~~ vim +80 include/linux/irqflags.h 81d68a96 Steven Rostedt 2008-05-12 66 df9ee292 David Howells 2010-10-07 67 /* df9ee292 David Howells 2010-10-07 68 * Wrap the arch provided IRQ routines to provide appropriate checks. df9ee292 David Howells 2010-10-07 69 */ df9ee292 David Howells 2010-10-07 70 #define raw_local_irq_disable() arch_local_irq_disable() df9ee292 David Howells 2010-10-07 71 #define raw_local_irq_enable() arch_local_irq_enable() df9ee292 David Howells 2010-10-07 72 #define raw_local_irq_save(flags) \ df9ee292 David Howells 2010-10-07 73 do { \ df9ee292 David Howells 2010-10-07 74 typecheck(unsigned long, flags); \ df9ee292 David Howells 2010-10-07 75 flags = arch_local_irq_save(); \ df9ee292 David Howells 2010-10-07 76 } while (0) df9ee292 David Howells 2010-10-07 77 #define raw_local_irq_restore(flags) \ df9ee292 David Howells 2010-10-07 78 do { \ df9ee292 David Howells 2010-10-07 79 typecheck(unsigned long, flags); \ df9ee292 David Howells 2010-10-07 @80 arch_local_irq_restore(flags); \ df9ee292 David Howells 2010-10-07 81 } while (0) df9ee292 David Howells 2010-10-07 82 #define raw_local_save_flags(flags) \ df9ee292 David Howells 2010-10-07 83 do { \ df9ee292 David Howells 2010-10-07 84 typecheck(unsigned long, flags); \ df9ee292 David Howells 2010-10-07 85 flags = arch_local_save_flags(); \ df9ee292 David Howells 2010-10-07 86 } while (0) df9ee292 David Howells 2010-10-07 87 #define raw_irqs_disabled_flags(flags) \ df9ee292 David Howells 2010-10-07 88 ({ \ df9ee292 David Howells 2010-10-07 89 typecheck(unsigned long, flags); \ df9ee292 David Howells 2010-10-07 90 arch_irqs_disabled_flags(flags); \ df9ee292 David Howells 2010-10-07 91 }) df9ee292 David Howells 2010-10-07 92 #define raw_irqs_disabled() (arch_irqs_disabled()) df9ee292 David Howells 2010-10-07 93 #define raw_safe_halt() arch_safe_halt() de30a2b3 Ingo Molnar 2006-07-03 94 :::::: The code at line 80 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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