diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2021-02-10 00:40:45 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-02-10 23:34:14 +0100 |
| commit | 3c5e0267ec3e6ed7d3f1793273cbf0beb4f86a74 (patch) | |
| tree | 905ce8fd2daf921538d26217049439fa70580574 | |
| parent | x86/irq/64: Adjust the per CPU irq stack pointer by 8 (diff) | |
| download | linux-3c5e0267ec3e6ed7d3f1793273cbf0beb4f86a74.tar.xz linux-3c5e0267ec3e6ed7d3f1793273cbf0beb4f86a74.zip | |
x86/apic: Split out spurious handling code
sysvec_spurious_apic_interrupt() calls into the handling body of
__spurious_interrupt() which is not obvious as that function is declared
inside the DEFINE_IDTENTRY_IRQ(spurious_interrupt) macro.
As __spurious_interrupt() is currently always inlined this ends up with two
copies of the same code for no reason.
Split the handling function out and invoke it from both entry points.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210210002512.469379641@linutronix.de
| -rw-r--r-- | arch/x86/kernel/apic/apic.c | 31 |
1 files changed, 19 insertions, 12 deletions
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c index 6bd20c0de8bc..02956c0d18e6 100644 --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -2133,18 +2133,11 @@ void __init register_lapic_address(unsigned long address) * Local APIC interrupts */ -/** - * spurious_interrupt - Catch all for interrupts raised on unused vectors - * @regs: Pointer to pt_regs on stack - * @vector: The vector number - * - * This is invoked from ASM entry code to catch all interrupts which - * trigger on an entry which is routed to the common_spurious idtentry - * point. - * - * Also called from sysvec_spurious_apic_interrupt(). +/* + * Common handling code for spurious_interrupt and spurious_vector entry + * points below. No point in allowing the compiler to inline it twice. */ -DEFINE_IDTENTRY_IRQ(spurious_interrupt) +static noinline void handle_spurious_interrupt(u8 vector) { u32 v; @@ -2179,9 +2172,23 @@ out: trace_spurious_apic_exit(vector); } +/** + * spurious_interrupt - Catch all for interrupts raised on unused vectors + * @regs: Pointer to pt_regs on stack + * @vector: The vector number + * + * This is invoked from ASM entry code to catch all interrupts which + * trigger on an entry which is routed to the common_spurious idtentry + * point. + */ +DEFINE_IDTENTRY_IRQ(spurious_interrupt) +{ + handle_spurious_interrupt(vector); +} + DEFINE_IDTENTRY_SYSVEC(sysvec_spurious_apic_interrupt) { - __spurious_interrupt(regs, SPURIOUS_APIC_VECTOR); + handle_spurious_interrupt(SPURIOUS_APIC_VECTOR); } /* |