s390/bitops: Slightly optimize ffs() and fls64()

Browse source

Use a simpler algorithm to calculate the result of ffs() and fls64().
This generates slightly better code and increases readability.

Kernel image size is reduced by ~3kb (gcc 15.1.0 + defconfig).

Suggested-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>

...

This commit is contained in:

Heiko Carstens 2025-08-04 17:08:54 +02:00 • committed by Alexander Gordeev

parent f9de6cdf4c

commit de88e74889

1 changed files with 2 additions and 5 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

7

arch/s390/include/asm/bitops.h

View file