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Date: Fri, 31 Aug 2018 22:01:36 +0200 (CEST) From: Thomas Gleixner <tglx@...utronix.de> To: Meelis Roos <mroos@...ux.ee> cc: Linux Kernel list <linux-kernel@...r.kernel.org>, x86@...nel.org, Peter Zijlstra <peterz@...radead.org> Subject: Re: cmpxchg.h:245:2: error: ‘asm’ operand has impossible constraints On Mon, 27 Aug 2018, Meelis Roos wrote: > While trying to compile v4.18-13105-gaba16dc5cf93 with gcc 5.3.1 on a > 32-bit x86 configured for AMD K6: I tried to get hold of that debian gcc 5.3.1 compiler, but no luck so far. > CC mm/slub.o > In file included from ./arch/x86/include/asm/atomic.h:8:0, > from ./include/linux/atomic.h:7, > from ./arch/x86/include/asm/thread_info.h:54, > 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" \ I so love the informative output of GCC on ASM errors .... What's even more confusing is that the __cmpxchg_double() macro has not been changed since Jan, 2012. Thanks, tglx
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