lkml.org 
[lkml]   [2018]   [Nov]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: arch/x86/include/asm/cmpxchg.h:245:2: error: 'asm' operand has impossible constraints
From
Date
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 <JBeulich@suse.com>
> :::::: CC: Ingo Molnar <mingo@elte.hu>
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
>

\
 
 \ /
  Last update: 2018-11-30 07:56    [W:0.035 / U:2.220 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site