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arm64: run softirqs on the per-CPU IRQ stack 

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>
This commit is contained in:
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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1
arch/arm64/Kconfig
View File

@ -230,6 +230,7 @@ config ARM64
select HAVE_ARCH_USERFAULTFD_MINOR if USERFAULTFD
select TRACE_IRQFLAGS_SUPPORT
select TRACE_IRQFLAGS_NMI_SUPPORT
select HAVE_SOFTIRQ_ON_OWN_STACK
help
ARM 64-bit (AArch64) Linux support.

14
arch/arm64/kernel/irq.c
View File

@ -21,7 +21,9 @@
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <asm/daifflags.h>
#include <asm/exception.h>
#include <asm/vmap_stack.h>
#include <asm/softirq_stack.h>
/* Only access this in an NMI enter/exit */
DEFINE_PER_CPU(struct nmi_ctx, nmi_contexts);
@ -71,6 +73,18 @@ static void init_irq_stacks(void)
}
#endif
#ifndef CONFIG_PREEMPT_RT
static void ____do_softirq(struct pt_regs *regs)
{
__do_softirq();
}
void do_softirq_own_stack(void)
{
call_on_irq_stack(NULL, ____do_softirq);
}
#endif
static void default_handle_irq(struct pt_regs *regs)
{
panic("IRQ taken without a root IRQ handler\n");