arm64: run softirqs on the per-CPU IRQ stack

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Currently arm64 supports per-CPU IRQ stack, but softirqs
are still handled in the task context.

Since any call to local_bh_enable() at any level in the task's
call stack may trigger a softirq processing run, which could
potentially cause a task stack overflow if the combined stack
footprints exceed the stack's size, let's run these softirqs
on the IRQ stack as well.

Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220815124739.15948-1-zhengqi.arch@bytedance.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Qi Zheng 2022-08-15 20:47:39 +08:00 • committed by Catalin Marinas

parent 3fc24ef32d

commit 8eb858c44b

2 changed files with 15 additions and 0 deletions

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arch/arm64/Kconfig

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14

arch/arm64/kernel/irq.c

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