Hi Steinar, [auto build test WARNING on usb/usb-testing] [also build test WARNING on v4.4-rc3 next-20151203] url: https://github.com/0day-ci/linux/commits/Steinar-H-Gunderson/Add-support-for-usbfs-zerocopy/20151206-034258 base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing config: x86_64-randconfig-x006-201549 (attached as .config) reproduce: # save the attached .config to linux build tree make ARCH=x86_64 All warnings (new ones prefixed by >>): In file included from include/linux/linkage.h:4:0, from include/linux/fs.h:4, from drivers/usb/core/devio.c:37: drivers/usb/core/devio.c: In function 'proc_do_submiturb': include/linux/err.h:21:38: warning: comparison between pointer and integer #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) ^ include/linux/compiler.h:137:45: note: in definition of macro 'unlikely' # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) ^ drivers/usb/core/devio.c:1617:6: note: in expansion of macro 'IS_ERR_VALUE' if (IS_ERR_VALUE(as->usbm)) { ^ include/linux/err.h:21:38: warning: comparison between pointer and integer #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) ^ include/linux/compiler.h:137:53: note: in definition of macro 'unlikely' # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) ^ drivers/usb/core/devio.c:1617:6: note: in expansion of macro 'IS_ERR_VALUE' if (IS_ERR_VALUE(as->usbm)) { ^ include/linux/err.h:21:38: warning: comparison between pointer and integer #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) ^ include/linux/compiler.h:110:47: note: in definition of macro 'likely_notrace' #define likely_notrace(x) __builtin_expect(!!(x), 1) ^ include/linux/compiler.h:137:58: note: in expansion of macro '__branch_check__' # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) ^ >> include/linux/err.h:21:25: note: in expansion of macro 'unlikely' #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) ^ drivers/usb/core/devio.c:1617:6: note: in expansion of macro 'IS_ERR_VALUE' if (IS_ERR_VALUE(as->usbm)) { ^ vim +/unlikely +21 include/linux/err.h a5ed3cee Joe Perches 2014-04-03 5 #include <linux/types.h> ^1da177e Linus Torvalds 2005-04-16 6 ^1da177e Linus Torvalds 2005-04-16 7 #include <asm/errno.h> ^1da177e Linus Torvalds 2005-04-16 8 ^1da177e Linus Torvalds 2005-04-16 9 /* ^1da177e Linus Torvalds 2005-04-16 10 * Kernel pointers have redundant information, so we can use a a5ed3cee Joe Perches 2014-04-03 11 * scheme where we can return either an error code or a normal ^1da177e Linus Torvalds 2005-04-16 12 * pointer with the same return value. ^1da177e Linus Torvalds 2005-04-16 13 * ^1da177e Linus Torvalds 2005-04-16 14 * This should be a per-architecture thing, to allow different ^1da177e Linus Torvalds 2005-04-16 15 * error and pointer decisions. ^1da177e Linus Torvalds 2005-04-16 16 */ fa79837d Ralf Baechle 2006-07-01 17 #define MAX_ERRNO 4095 fa79837d Ralf Baechle 2006-07-01 18 ebba5f9f Randy Dunlap 2006-09-27 19 #ifndef __ASSEMBLY__ ebba5f9f Randy Dunlap 2006-09-27 20 fa79837d Ralf Baechle 2006-07-01 @21 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) 07ab67c8 Linus Torvalds 2005-05-19 22 e47103b1 Jani Nikula 2010-05-24 23 static inline void * __must_check ERR_PTR(long error) ^1da177e Linus Torvalds 2005-04-16 24 { ^1da177e Linus Torvalds 2005-04-16 25 return (void *) error; ^1da177e Linus Torvalds 2005-04-16 26 } ^1da177e Linus Torvalds 2005-04-16 27 e7152b97 Dan Carpenter 2013-07-03 28 static inline long __must_check PTR_ERR(__force const void *ptr) ^1da177e Linus Torvalds 2005-04-16 29 { :::::: The code at line 21 was first introduced by commit :::::: fa79837d5b562766a3e3cfad4753a3df8e0a1319 [PATCH] Fix IS_ERR Threshold Value :::::: TO: Ralf Baechle <ralf@xxxxxxxxxxxxxx> :::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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