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| author |   Nicholas Piggin <npiggin@gmail.com> | 2021-06-18 01:51:08 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2021-06-25 00:06:56 +1000 |
| commit | f23699c93becd746295aaa506537882a46a62219 (patch) | |
| tree | ea44289996524915c83e6876b39babbe6a640ff8 /README | |
| parent | powerpc/64s: save one more register in the masked interrupt handler (diff) | |
| download | linux-dev-f23699c93becd746295aaa506537882a46a62219.tar.xz linux-dev-f23699c93becd746295aaa506537882a46a62219.zip | |
powerpc/64: allow alternate return locations for soft-masked interrupts
The exception table fixup adjusts a failed page fault's interrupt return
location if it was taken at an address specified in the exception table,
to a corresponding fixup handler address.
Introduce a variation of that idea which adds a fixup table for NMIs and
soft-masked asynchronous interrupts. This will be used to protect
certain critical sections that are sensitive to being clobbered by
interrupts coming in (due to using the same SPRs and/or irq soft-mask
state).
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210617155116.2167984-10-npiggin@gmail.com
Diffstat (limited to 'README')
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