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| author |  Michael Ellerman <mpe@ellerman.id.au>
| 2023-11-30 23:50:45 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au>
| 2024-03-03 22:20:29 +1100 |
| commit | 4eb20bf34ea296f648971a8528e32cd80efcbe89 (patch) | |
| tree | ef530697adb634bd75f8e322d9ba9a325ba31b9c /arch/powerpc/perf | |
| parent | powerpc: Stop using of_root (diff) | |
| download | linux-4eb20bf34ea296f648971a8528e32cd80efcbe89.tar.gz linux-4eb20bf34ea296f648971a8528e32cd80efcbe89.tar.bz2 linux-4eb20bf34ea296f648971a8528e32cd80efcbe89.zip | |
powerpc/irq: Allow softirq to hardirq stack transition
Allow a transition from the softirq stack to the hardirq stack when
handling a hardirq. Doing so means a hardirq received while deep in
softirq processing is less likely to cause a stack overflow of the
softirq stack.
Previously it wasn't safe to do so because irq_exit() (which initiates
softirq processing) was called on the hardirq stack.
That was changed in commit 1b1b6a6f4cc0 ("powerpc: handle irq_enter/
irq_exit in interrupt handler wrappers") and 1346d00e1bdf ("powerpc:
Don't select HAVE_IRQ_EXIT_ON_IRQ_STACK").
The allowed transitions are now:
- process stack -> hardirq stack
- process stack -> softirq stack
- process stack -> softirq stack -> hardirq stack
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231130125045.3080961-1-mpe@ellerman.id.au
Diffstat (limited to 'arch/powerpc/perf')
0 files changed, 0 insertions, 0 deletions