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(parent: 9e27086) | patch
powerpc: Don't use thread struct for saving SRR0/1 on syscall.
authorChristophe Leroy <christophe.leroy@c-s.fr>
Fri, 31 Jan 2020 11:34:55 +0000 (11:34 +0000)
committerMichael Ellerman <mpe@ellerman.id.au>
Wed, 19 Feb 2020 11:46:08 +0000 (22:46 +1100)
commitc06f0aff035ed5a7eaff5daa8e11e7ad28ab0d54
tree0ab2645cbb2baeadc137e957adcacfc10c521e75tree | snapshot
parent9e27086292aa880921a0f2b8501e5189d5efcf03commit | diff
powerpc: Don't use thread struct for saving SRR0/1 on syscall.

CR0 can be saved later, and CTR can also be used for saving.

Keep SRR1 in r9 and stash SRR0 in CTR, this avoids using thread_struct
in memory for that.

Saves 3 cycles (ie 1%) in null_syscall selftest on 8xx.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b94c3bc03bac9431fec2dadb686384c481889422.1580470483.git.christophe.leroy@c-s.fr
arch/powerpc/kernel/head_32.h diff | blob | history
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