powerpc/64: treat low kernel text as irqs soft-masked

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Treat code below __end_soft_masked as soft-masked for the purpose
of alternate return. 64s already mostly does this for scv entry.

This will be used to exit from interrupts without disabling MSR[EE].

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210617155116.2167984-12-npiggin@gmail.com

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Nicholas Piggin 2021-06-18 01:51:10 +10:00 • committed by Michael Ellerman

parent 862fa56352

commit 9d1988ca87

4 changed files with 35 additions and 13 deletions

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11

arch/powerpc/include/asm/interrupt.h

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12

arch/powerpc/kernel/exceptions-64e.S

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19

arch/powerpc/kernel/exceptions-64s.S

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6

arch/powerpc/kernel/interrupt_64.S

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