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SubjectRe: [PATCH] s390: mark __cpacf_check_opcode() and cpacf_query_func() as __always_inline
On Fri, 17 May 2019 15:54:24 +0900
Masahiro Yamada <yamada.masahiro@socionext.com> wrote:

> Commit e60fb8bf68d4 ("s390/cpacf: mark scpacf_query() as __always_inline")
> was not enough to make sure to meet the 'i' (immediate) constraint for the
> asm operands.
>
> With CONFIG_OPTIMIZE_INLINING enabled, Laura Abbott reported error
> with gcc 9.1.1:
>
> In file included from arch/s390/crypto/prng.c:29:
> ./arch/s390/include/asm/cpacf.h: In function 'cpacf_query_func':
> ./arch/s390/include/asm/cpacf.h:170:2: warning: asm operand 3 probably doesn't match constraints
> 170 | asm volatile(
> | ^~~
> ./arch/s390/include/asm/cpacf.h:170:2: error: impossible constraint in 'asm'
>
> Add more __always_inline to force inlining.
>
> Fixes: 9012d011660e ("compiler: allow all arches to enable CONFIG_OPTIMIZE_INLINING")
> Reported-by: Laura Abbott <labbott@redhat.com>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

Added to our internal tree and I will add it to s390/linux soon. Thanks.

Do you have a Kconfig patch in the works to enable OPTIMIZE_INLINING?
Otherwise we could just add it.

> ---
>
> arch/s390/include/asm/cpacf.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h
> index f316de40e51b..19459dfb4295 100644
> --- a/arch/s390/include/asm/cpacf.h
> +++ b/arch/s390/include/asm/cpacf.h
> @@ -177,7 +177,7 @@ static inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask)
> : "cc");
> }
>
> -static inline int __cpacf_check_opcode(unsigned int opcode)
> +static __always_inline int __cpacf_check_opcode(unsigned int opcode)
> {
> switch (opcode) {
> case CPACF_KMAC:
> @@ -217,7 +217,7 @@ static inline int cpacf_test_func(cpacf_mask_t *mask, unsigned int func)
> return (mask->bytes[func >> 3] & (0x80 >> (func & 7))) != 0;
> }
>
> -static inline int cpacf_query_func(unsigned int opcode, unsigned int func)
> +static __always_inline int cpacf_query_func(unsigned int opcode, unsigned int func)
> {
> cpacf_mask_t mask;
>


--
blue skies,
Martin.

"Reality continues to ruin my life." - Calvin.

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