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Heiko Carstens 69b2965976 s390/preempt: disable __preempt_count_add() optimization for PROFILE_ALL_BRANCHES

[ Upstream commit 63678eecec57fc51b778be3da35a397931287170 ]

gcc 12 does not (always) optimize away code that should only be generated
if parameters are constant and within in a certain range. This depends on
various obscure kernel config options, however in particular
PROFILE_ALL_BRANCHES can trigger this compile error:

In function ‘__atomic_add_const’,
    inlined from ‘__preempt_count_add.part.0’ at ./arch/s390/include/asm/preempt.h:50:3:
./arch/s390/include/asm/atomic_ops.h:80:9: error: impossible constraint in ‘asm’
   80 |         asm volatile(                                                   \
      |         ^~~

Workaround this by simply disabling the optimization for
PROFILE_ALL_BRANCHES, since the kernel will be so slow, that this
optimization won't matter at all.

Reported-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-06-09 10:22:36 +02:00

alpha

alpha: define get_cycles macro for arch-override

2022-05-30 09:29:13 +02:00

arc

ARC: entry: fix syscall_trace_exit argument

2022-04-27 14:39:00 +02:00

arm

ARM: dts: s5pv210: Correct interrupt name for bluetooth in Aries

2022-06-06 08:43:40 +02:00

arm64

arm64: compat: Do not treat syscall number as ESR_ELx for a bad syscall