s390/mm: make use of atomic_fetch_xor()

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Make use of atomic_fetch_xor() instead of an atomic_cmpxchg() loop to
implement atomic_xor_bits() (aka atomic_xor_return()). This makes the C
code more readable and in addition generates better code, since for z196
and newer a single lax instruction is generated instead of a cmpxchg()
loop.

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

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Heiko Carstens 2023-03-17 14:51:41 +01:00

parent 038c5bedbc

commit d28d86a07d

1 changed files with 1 additions and 7 deletions

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arch/s390/mm/pgalloc.c

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