tree: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next head: 3382a6220ff3bac886d9d90766f3fe18cf25b468 commit: d0563a1297e234ed37f6b51c2e9321accebd1839 [81/84] powerpc: Implement {cmp}xchg for u8 and u16 config: powerpc-allyesconfig (attached as .config) compiler: powerpc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705 reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout d0563a1297e234ed37f6b51c2e9321accebd1839 # save the attached .config to linux build tree make.cross ARCH=powerpc
All warnings (new ones prefixed by >>): In file included from arch/powerpc/include/asm/pgtable-be-types.h:4:0, from arch/powerpc/include/asm/page.h:292, from arch/powerpc/include/asm/book3s/64/mmu-hash.h:16, from arch/powerpc/include/asm/book3s/64/mmu.h:29, from arch/powerpc/include/asm/mmu.h:282, from arch/powerpc/include/asm/lppaca.h:36, from arch/powerpc/include/asm/paca.h:21, from arch/powerpc/include/asm/current.h:16, from include/linux/mutex.h:13, from include/linux/kernfs.h:13, from include/linux/sysfs.h:15, from include/linux/kobject.h:21, from include/linux/cdev.h:4, from include/drm/drmP.h:36, from drivers/gpu/drm/drm_lock.c:37: drivers/gpu/drm/drm_lock.c: In function 'drm_lock_take': >> arch/powerpc/include/asm/cmpxchg.h:484:37: warning: passing argument 1 of >> '__cmpxchg' discards 'volatile' qualifier from pointer target type >> [-Wdiscarded-qualifiers] (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ ^ >> drivers/gpu/drm/drm_lock.c:69:10: note: in expansion of macro 'cmpxchg' prev = cmpxchg(lock, old, new); ^~~~~~~ arch/powerpc/include/asm/cmpxchg.h:402:1: note: expected 'void *' but argument is of type 'volatile unsigned int *' __cmpxchg(void *ptr, unsigned long old, unsigned long new, ^~~~~~~~~ drivers/gpu/drm/drm_lock.c: In function 'drm_lock_transfer': >> arch/powerpc/include/asm/cmpxchg.h:484:37: warning: passing argument 1 of >> '__cmpxchg' discards 'volatile' qualifier from pointer target type >> [-Wdiscarded-qualifiers] (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ ^ drivers/gpu/drm/drm_lock.c:112:10: note: in expansion of macro 'cmpxchg' prev = cmpxchg(lock, old, new); ^~~~~~~ arch/powerpc/include/asm/cmpxchg.h:402:1: note: expected 'void *' but argument is of type 'volatile unsigned int *' __cmpxchg(void *ptr, unsigned long old, unsigned long new, ^~~~~~~~~ drivers/gpu/drm/drm_lock.c: In function 'drm_legacy_lock_free': >> arch/powerpc/include/asm/cmpxchg.h:484:37: warning: passing argument 1 of >> '__cmpxchg' discards 'volatile' qualifier from pointer target type >> [-Wdiscarded-qualifiers] (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ ^ drivers/gpu/drm/drm_lock.c:135:10: note: in expansion of macro 'cmpxchg' prev = cmpxchg(lock, old, new); ^~~~~~~ arch/powerpc/include/asm/cmpxchg.h:402:1: note: expected 'void *' but argument is of type 'volatile unsigned int *' __cmpxchg(void *ptr, unsigned long old, unsigned long new, ^~~~~~~~~ drivers/gpu/drm/drm_lock.c: In function 'drm_legacy_idlelock_release': >> arch/powerpc/include/asm/cmpxchg.h:484:37: warning: passing argument 1 of >> '__cmpxchg' discards 'volatile' qualifier from pointer target type >> [-Wdiscarded-qualifiers] (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ ^ drivers/gpu/drm/drm_lock.c:313:12: note: in expansion of macro 'cmpxchg' prev = cmpxchg(lock, old, DRM_KERNEL_CONTEXT); ^~~~~~~ arch/powerpc/include/asm/cmpxchg.h:402:1: note: expected 'void *' but argument is of type 'volatile unsigned int *' __cmpxchg(void *ptr, unsigned long old, unsigned long new, ^~~~~~~~~ vim +484 arch/powerpc/include/asm/cmpxchg.h d0563a12 Pan Xinhui 2016-04-27 468 case 2: d0563a12 Pan Xinhui 2016-04-27 469 return __cmpxchg_u16_acquire(ptr, old, new); 56c08e6d Boqun Feng 2015-12-15 470 case 4: 56c08e6d Boqun Feng 2015-12-15 471 return __cmpxchg_u32_acquire(ptr, old, new); 56c08e6d Boqun Feng 2015-12-15 472 #ifdef CONFIG_PPC64 56c08e6d Boqun Feng 2015-12-15 473 case 8: 56c08e6d Boqun Feng 2015-12-15 474 return __cmpxchg_u64_acquire(ptr, old, new); 56c08e6d Boqun Feng 2015-12-15 475 #endif 56c08e6d Boqun Feng 2015-12-15 476 } 10d8b148 pan xinhui 2016-02-23 477 BUILD_BUG_ON_MSG(1, "Unsupported size for __cmpxchg_acquire"); 56c08e6d Boqun Feng 2015-12-15 478 return old; 56c08e6d Boqun Feng 2015-12-15 479 } ae3a197e David Howells 2012-03-28 480 #define cmpxchg(ptr, o, n) \ ae3a197e David Howells 2012-03-28 481 ({ \ ae3a197e David Howells 2012-03-28 482 __typeof__(*(ptr)) _o_ = (o); \ ae3a197e David Howells 2012-03-28 483 __typeof__(*(ptr)) _n_ = (n); \ ae3a197e David Howells 2012-03-28 @484 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \ ae3a197e David Howells 2012-03-28 485 (unsigned long)_n_, sizeof(*(ptr))); \ ae3a197e David Howells 2012-03-28 486 }) ae3a197e David Howells 2012-03-28 487 ae3a197e David Howells 2012-03-28 488 ae3a197e David Howells 2012-03-28 489 #define cmpxchg_local(ptr, o, n) \ ae3a197e David Howells 2012-03-28 490 ({ \ ae3a197e David Howells 2012-03-28 491 __typeof__(*(ptr)) _o_ = (o); \ ae3a197e David Howells 2012-03-28 492 __typeof__(*(ptr)) _n_ = (n); \ :::::: The code at line 484 was first introduced by commit :::::: ae3a197e3d0bfe3f4bf1693723e82dc018c096f3 Disintegrate asm/system.h for PowerPC :::::: TO: David Howells <dhowe...@redhat.com> :::::: CC: David Howells <dhowe...@redhat.com> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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