On 30/11/2018 07:44, kbuild test robot wrote: > Hi Juergen, > > FYI, the error/warning still remains.
This problem is one of gcc. It is in no way the (direct) result of my patch. Please see my gcc bug report: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=908154 Juergen > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git > master > head: 94f371cb73944b410a269d570d6946c042f2ddd0 > commit: 6da63eb241a05b0e676d68975e793c0521387141 x86/paravirt: Move the > pv_irq_ops under the PARAVIRT_XXL umbrella > date: 3 months ago > config: i386-randconfig-sb0-11301144 (attached as .config) > compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4 > reproduce: > git checkout 6da63eb241a05b0e676d68975e793c0521387141 > # 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 arch/x86/include/asm/msr.h:67, > from arch/x86/include/asm/processor.h:21, > 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%c4b %2; sete %0" \ > ^ > arch/x86/include/asm/cmpxchg.h:254:2: 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)); \ > cdcd6298 Jan Beulich 2012-01-02 @245 asm volatile(pfx > "cmpxchg%c4b %2; sete %0" \ > cdcd6298 Jan Beulich 2012-01-02 246 : "=a" > (__ret), "+d" (__old2), \ > cdcd6298 Jan Beulich 2012-01-02 247 "+m" > (*(p1)), "+m" (*(p2)) \ > cdcd6298 Jan Beulich 2012-01-02 248 : "i" (2 * > sizeof(long)), "a" (__old1), \ > cdcd6298 Jan Beulich 2012-01-02 249 "b" > (__new1), "c" (__new2)); \ > cdcd6298 Jan Beulich 2012-01-02 250 __ret; > \ > cdcd6298 Jan Beulich 2012-01-02 251 }) > cdcd6298 Jan Beulich 2012-01-02 252 > > :::::: The code at line 245 was first introduced by commit > :::::: cdcd629869fabcd38ebd24a03b0a05ec1cbcafb0 x86: Fix and improve > cmpxchg_double{,_local}() > > :::::: TO: Jan Beulich <jbeul...@suse.com> > :::::: CC: Ingo Molnar <mi...@elte.hu> > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation >
