linux-kernel - Re: [PATCH 5.4-rc1 BUILD FIX] s390: mark __cpacf_query() as __always

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 linux-cve-announce 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]

Message-ID: <nycvar.YFH.7.76.1910012214080.13160@cbobk.fhfr.pm>
Date:   Tue, 1 Oct 2019 22:15:15 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Heiko Carstens <heiko.carstens@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
cc:     linux-s390@...r.kernel.org, Michal Kubecek <mkubecek@...e.cz>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5.4-rc1 BUILD FIX] s390: mark __cpacf_query() as
 __always_inline

On Tue, 1 Oct 2019, Jiri Kosina wrote:

> arch/s390/kvm/kvm-s390.c calls on several places __cpacf_query() directly, 
> which makes it impossible to meet the "i" constraint for the asm operands 
> (opcode in this case).
> 
> As we are now force-enabling CONFIG_OPTIMIZE_INLINING on all 
> architectures, this causes a build failure on s390:
> 
>    In file included from arch/s390/kvm/kvm-s390.c:44:
>    ./arch/s390/include/asm/cpacf.h: In function '__cpacf_query':
>    ./arch/s390/include/asm/cpacf.h:179:2: warning: asm operand 3 probably doesn't match constraints
>      179 |  asm volatile(
>          |  ^~~
>    ./arch/s390/include/asm/cpacf.h:179:2: error: impossible constraint in 'asm'
> 
> Mark __cpacf_query() as __always_inline in order to fix that, analogically 
> how we fixes __cpacf_check_opcode(), cpacf_query_func() and scpacf_query() 
> already.
> 
> Reported-and-tested-by: Michal Kubecek <mkubecek@...e.cz>
> Fixes: d83623c5eab2 ("s390: mark __cpacf_check_opcode() and cpacf_query_func() as __always_inline")
> Fixes: e60fb8bf68d4 ("s390/cpacf: mark scpacf_query() as __always_inline")
> Fixes: ac7c3e4ff401 ("compiler: enable CONFIG_OPTIMIZE_INLINING forcibly")
> Fixes: 9012d011660e ("compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING")
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

Gah, due to bug in my script the sigoff doesn't match the From:, so 
whoever is potentially applying it, please ammend it with

	From: Jiri Kosina <jkosina@...e.cz>

Sorry for the noise.

-- 
Jiri Kosina
SUSE Labs