powerpc/64s: Leave interrupts hard enabled in context switch for radix

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Commit 4387e9ff25 ("[POWERPC] Fix PMU + soft interrupt disable bug")
hard disabled interrupts over the low level context switch, because
the SLB management can't cope with a PMU interrupt accesing the stack
in that window.

Radix based kernel mapping does not use the SLB so it does not require
interrupts hard disabled here.

This is worth 1-2% in context switch performance on POWER9.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Nicholas Piggin 2017-06-09 01:36:06 +10:00 • committed by Michael Ellerman

parent bc4f65e4cf

commit e4c0fc5f72

2 changed files with 16 additions and 6 deletions

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8

arch/powerpc/kernel/entry_64.S

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14

arch/powerpc/kernel/process.c

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