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powerpc/bpf/32: No need to zeroise r4 when not doing tail call
authorChristophe Leroy <christophe.leroy@csgroup.eu>
Wed, 1 Feb 2023 10:04:24 +0000 (11:04 +0100)
committerMichael Ellerman <mpe@ellerman.id.au>
Fri, 10 Feb 2023 11:17:34 +0000 (22:17 +1100)
commit6376ed8feca829039d31a208216b958f0e439d87
treebb58c4235bc4790da6938024ed90b293e93b2470tree | snapshot
parentd9ab6da64fd15608c9feb20d769d8df1a32fe212commit | diff
powerpc/bpf/32: No need to zeroise r4 when not doing tail call

r4 is cleared at function entry and used as tail call count.

But when the function does not perform tail call, r4 is
ignored, so no need to clear it.

Replace it by a NOP in that case.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/9c5440b2b6d90a78600257433ac499b5c5101fbb.1675245773.git.christophe.leroy@csgroup.eu
arch/powerpc/net/bpf_jit_comp32.c diff | blob | history
Domain: System / Kernel;