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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-09-24 18:12:45 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-09-27 12:28:32 +0200 |
| commit | 441e90369344d229c0f04024ea5d4d51f06b137d (patch) | |
| tree | a66979eafb0fc79d3a9d393835e22aeb9ab553b9 /arch/x86/kernel/irq_32.c | |
| parent | b70e13885cf63b6f99cbd9a1dbb6beaa2622bf68 (diff) | |
| download | linux-stable-441e90369344d229c0f04024ea5d4d51f06b137d.tar.gz linux-stable-441e90369344d229c0f04024ea5d4d51f06b137d.tar.bz2 linux-stable-441e90369344d229c0f04024ea5d4d51f06b137d.zip | |
x86/softirq: Disable softirq stacks on PREEMPT_RT
PREEMPT_RT preempts softirqs and the current implementation avoids
do_softirq_own_stack() and only uses __do_softirq().
Disable the unused softirqs stacks on PREEMPT_RT to safe some memory and
ensure that do_softirq_own_stack() is not used which is not expected.
[ bigeasy: commit description. ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210924161245.2357247-1-bigeasy@linutronix.de
Diffstat (limited to 'arch/x86/kernel/irq_32.c')
| -rw-r--r-- | arch/x86/kernel/irq_32.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index 044902d5a3c4..e5dd6da78713 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -132,6 +132,7 @@ int irq_init_percpu_irqstack(unsigned int cpu) return 0; } +#ifndef CONFIG_PREEMPT_RT void do_softirq_own_stack(void) { struct irq_stack *irqstk; @@ -148,6 +149,7 @@ void do_softirq_own_stack(void) call_on_stack(__do_softirq, isp); } +#endif void __handle_irq(struct irq_desc *desc, struct pt_regs *regs) { |