s390/cmpxchg: get rid of gcc atomic builtins

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s390 is the only architecture in the kernel which makes use of gcc's
atomic builtin functions. Even though I don't see any technical
problem with that right now, remove this code and open-code
compare-and-swap loops again, like every other architecture is doing
it also.
We can switch to a generic implementation when other architectures are
doing that also.

See also https://lwn.net/Articles/586838/ for forther details.

This basically reverts commit f318a1229b ("s390/cmpxchg: use
compiler builtins").

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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This commit is contained in:

Heiko Carstens 2021-04-06 14:51:48 +02:00

parent b23eb636d7

commit d2b1f6d2d3

1 changed files with 150 additions and 15 deletions

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arch/s390/include/asm/cmpxchg.h

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