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

Christian Borntraeger
2019-10-02T06:44:29Z

On 01.10.19 22:08, 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@suse.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@suse.cz>

Thanks applied.

>
> I am wondering how is it possible that none of the build-testing
> infrastructure we have running against linux-next caught this? Not enough
> non-x86 coverage?

We do build-test linux-next daily. Maybe our compiler just made a different
inlining decision.