powerpc: Don't handle ALTIVEC/SPE in ASM in _switch(). Do it in C.

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_switch() saves and restores ALTIVEC and SPE status.
For altivec this is redundant with what __switch_to() does with
save_sprs() and restore_sprs() and giveup_all() before
calling _switch().

Add support for SPI in save_sprs() and restore_sprs() and
remove things from _switch().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/8ab21fd93d6e0047aa71e6509e5e312f14b2991b.1620998075.git.christophe.leroy@csgroup.eu

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Christophe Leroy 2021-05-14 13:14:53 +00:00 • committed by Michael Ellerman

parent 4423eff71c

commit 359c2ca74d

3 changed files with 9 additions and 37 deletions

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2

arch/powerpc/kernel/asm-offsets.c

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35

arch/powerpc/kernel/entry_32.S

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9

arch/powerpc/kernel/process.c

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