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authorMichael S. Tsirkin <mst@redhat.com>2025-09-27 08:29:35 -0400
committerJakub Kicinski <kuba@kernel.org>2025-09-29 18:13:10 -0700
commitc39d6d4d933381714b6e5d735545256558ec6c05 (patch)
tree6980bc86e94659c058f7e8d912204cadeb74c0ac /rust/helpers/mm.c
parente8c4840d0c198215866728626b5c197048d4368b (diff)
ptr_ring: __ptr_ring_zero_tail micro optimization
__ptr_ring_zero_tail currently does the - 1 operation twice: - during initialization of head - at each loop iteration Let's just do it in one place, all we need to do is adjust the loop condition. this is better: - a slightly clearer logic with less duplication - uses prefix -- we don't need to save the old value - one less - 1 operation - for example, when ring is empty we now don't do - 1 at all, existing code does it once Text size shrinks from 15081 to 15050 bytes. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/bcd630c7edc628e20d4f8e037341f26c90ab4365.1758976026.git.mst@redhat.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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