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| author |   Heiko Carstens <hca@linux.ibm.com> | 2022-05-06 11:33:19 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2022-05-11 14:40:58 +0200 |
| commit | 63678eecec57fc51b778be3da35a397931287170 (patch) | |
| tree | bcb49f8eb4c0824719baec46ce380bbc0e5c8cd6 /arch/s390/lib/spinlock.c | |
| parent | s390/stp: clock_delta should be signed (diff) | |
| download | linux-dev-63678eecec57fc51b778be3da35a397931287170.tar.xz linux-dev-63678eecec57fc51b778be3da35a397931287170.zip | |
s390/preempt: disable __preempt_count_add() optimization for PROFILE_ALL_BRANCHES
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>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions