powerpc: Use SWITCH_FRAME_SIZE for prom and rtas entry

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Commit 6c1719942e ("powerpc/of: Remove useless register save/restore
when calling OF back") removed the saving of srr0 and srr1 when calling
into OpenFirmware. Commit e31aa453bb ("powerpc: Use LOAD_REG_IMMEDIATE
only for constants on 64-bit") did the same for rtas.

This means we don't need to save the extra stack space and can use
the common SWITCH_FRAME_SIZE.

There were already no users of _SRR0 and _SRR1 so we can remove them
too.

Link: https://github.com/linuxppc/linux/issues/83
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Joel Stanley 2018-10-12 13:14:06 +10:30 • committed by Michael Ellerman

parent 65b9fdadfc

commit ed9e84a4d7

2 changed files with 5 additions and 14 deletions

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9

arch/powerpc/kernel/asm-offsets.c

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10

arch/powerpc/kernel/entry_64.S

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