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@xxxxxxx> 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@xxxxxxx> --- 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? arch/s390/include/asm/cpacf.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/include/asm/cpacf.h b/arch/s390/include/asm/cpacf.h index a092f63aac6a..c0f3bfeddcbe 100644 --- a/arch/s390/include/asm/cpacf.h +++ b/arch/s390/include/asm/cpacf.h @@ -171,7 +171,7 @@ typedef struct { unsigned char bytes[16]; } cpacf_mask_t; * * Returns 1 if @func is available for @opcode, 0 otherwise */ -static inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask) +static __always_inline void __cpacf_query(unsigned int opcode, cpacf_mask_t *mask) { register unsigned long r0 asm("0") = 0; /* query function */ register unsigned long r1 asm("1") = (unsigned long) mask; -- Jiri Kosina SUSE Labs