Hi Ingo, FYI, the error/warning still remains.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: e1ef035d272ef4dbfdda98e58699698305138856 commit: ffb61c6346d0f02b2a03377a3edac838c1f09b45 Revert "x86/bug: Macrofy the BUG table section handling, to work around GCC inlining bugs" date: 13 days ago config: i386-randconfig-sb0-01012038 (attached as .config) compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 reproduce: git checkout ffb61c6346d0f02b2a03377a3edac838c1f09b45 # save the attached .config to linux build tree make ARCH=i386 All errors (new ones prefixed by >>): In file included from arch/x86/include/asm/atomic.h:8:0, from include/linux/atomic.h:7, from include/linux/jump_label.h:250, from include/linux/static_key.h:1, from arch/x86/include/asm/nospec-branch.h:6, from arch/x86/include/asm/paravirt_types.h:46, from arch/x86/include/asm/ptrace.h:94, from arch/x86/include/asm/math_emu.h:5, from arch/x86/include/asm/processor.h:12, from arch/x86/include/asm/cpufeature.h:5, from arch/x86/include/asm/thread_info.h:53, from include/linux/thread_info.h:38, from arch/x86/include/asm/preempt.h:7, from include/linux/preempt.h:81, from include/linux/spinlock.h:51, from include/linux/mmzone.h:8, from include/linux/gfp.h:6, from include/linux/mm.h:10, from mm/slub.c:13: mm/slub.c: In function '__slab_free': >> arch/x86/include/asm/cmpxchg.h:245:2: error: 'asm' operand has impossible >> constraints asm volatile(pfx "cmpxchg%c5b %1" \ ^ arch/x86/include/asm/cmpxchg.h:256:2: note: in expansion of macro '__cmpxchg_double' __cmpxchg_double(LOCK_PREFIX, p1, p2, o1, o2, n1, n2) ^ include/asm-generic/atomic-instrumented.h:457:2: note: in expansion of macro 'arch_cmpxchg_double' arch_cmpxchg_double(__ai_p1, (p2), (o1), (o2), (n1), (n2)); \ ^ mm/slub.c:403:7: note: in expansion of macro 'cmpxchg_double' if (cmpxchg_double(&page->freelist, &page->counters, ^ vim +/asm +245 arch/x86/include/asm/cmpxchg.h 3d94ae0c Jeremy Fitzhardinge 2011-09-28 235 cdcd6298 Jan Beulich 2012-01-02 236 #define __cmpxchg_double(pfx, p1, p2, o1, o2, n1, n2) \ cdcd6298 Jan Beulich 2012-01-02 237 ({ \ cdcd6298 Jan Beulich 2012-01-02 238 bool __ret; \ cdcd6298 Jan Beulich 2012-01-02 239 __typeof__(*(p1)) __old1 = (o1), __new1 = (n1); \ cdcd6298 Jan Beulich 2012-01-02 240 __typeof__(*(p2)) __old2 = (o2), __new2 = (n2); \ cdcd6298 Jan Beulich 2012-01-02 241 BUILD_BUG_ON(sizeof(*(p1)) != sizeof(long)); \ cdcd6298 Jan Beulich 2012-01-02 242 BUILD_BUG_ON(sizeof(*(p2)) != sizeof(long)); \ cdcd6298 Jan Beulich 2012-01-02 243 VM_BUG_ON((unsigned long)(p1) % (2 * sizeof(long))); \ cdcd6298 Jan Beulich 2012-01-02 244 VM_BUG_ON((unsigned long)((p1) + 1) != (unsigned long)(p2)); \ c808c09b Uros Bizjak 2018-09-28 @245 asm volatile(pfx "cmpxchg%c5b %1" \ c808c09b Uros Bizjak 2018-09-28 246 CC_SET(e) \ c808c09b Uros Bizjak 2018-09-28 247 : CC_OUT(e) (__ret), \ c808c09b Uros Bizjak 2018-09-28 248 "+m" (*(p1)), "+m" (*(p2)), \ c808c09b Uros Bizjak 2018-09-28 249 "+a" (__old1), "+d" (__old2) \ c808c09b Uros Bizjak 2018-09-28 250 : "i" (2 * sizeof(long)), \ cdcd6298 Jan Beulich 2012-01-02 251 "b" (__new1), "c" (__new2)); \ cdcd6298 Jan Beulich 2012-01-02 252 __ret; \ cdcd6298 Jan Beulich 2012-01-02 253 }) cdcd6298 Jan Beulich 2012-01-02 254 :::::: The code at line 245 was first introduced by commit :::::: c808c09b527cd60d9a0d53799935f75e2452174d x86/asm: Use CC_SET()/CC_OUT() in __cmpxchg_double() :::::: TO: Uros Bizjak <ubiz...@gmail.com> :::::: CC: Borislav Petkov <b...@suse.de> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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