projects / platform / kernel / linux-rpi.git / commit
? search:
summary | shortlog | log | commit | commitdiff | tree
(parent: 79f4bb1) | patch
powerpc/32: Use fast instruction to set MSR RI in exception prolog on 8xx
authorChristophe Leroy <christophe.leroy@csgroup.eu>
Fri, 12 Mar 2021 12:50:20 +0000 (12:50 +0000)
committerMichael Ellerman <mpe@ellerman.id.au>
Mon, 29 Mar 2021 02:22:04 +0000 (13:22 +1100)
commite464d92b292cc61f8f0791cf87d3646204bbb208
treecd580d707c120a2391b29e0a64e3e4208cf2cad0tree | snapshot
parent79f4bb17f18162dd95d6aeb6dc3b7da54d6139aacommit | diff
powerpc/32: Use fast instruction to set MSR RI in exception prolog on 8xx

8xx has registers SPRN_NRI, SPRN_EID and SPRN_EIE for changing
MSR EE and RI.

Use SPRN_EID in exception prolog to set RI.

On an 8xx, it reduces the null_syscall test by 3 cycles.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/65f6bda827c2a2abce71ea7e07543e791163da33.1615552866.git.christophe.leroy@csgroup.eu
arch/powerpc/kernel/head_32.h diff | blob | history
Domain: System / Kernel;