lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Thu, 6 Sep 2018 15:54:06 +0200
From:   Juergen Gross <jgross@...e.com>
To:     mroos@...ux.ee
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org,
        peterz@...radead.org, x86@...nel.org
Subject: Re: cmpxchg.h:245:2: error: ‘asm’ operand has impossible constraints

Hey Meelis,

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
>   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"   \

Could you give the attched patch a try? I've been hit by this issue
via kbuild robot complaining about one of my patches which didn't
touch the asm stuff above.

I suspect the "=a" contraint of the outputs and "a" of the inputs
are the culprit. You could save me from having to search through
all the debian repos for a gcc showing that issue...


Juergen

View attachment "0001-x86-correct-inline-asm-constraints-in-__cmpxchg_doub.patch" of type "text/x-patch" (1149 bytes)

Powered by blists - more mailing lists