4.17-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Gleixner tglx@linutronix.de
commit c0255770ccdc77ef2184d2a0a2e0cde09d2b44a4 upstream.
apic_ack_edge() is explicitely for handling interrupt affinity cleanup when interrupt remapping is not available or disable.
Remapped interrupts and also some of the platform specific special interrupts, e.g. UV, invoke ack_APIC_irq() directly.
To address the issue of failing an affinity update with -EBUSY the delayed affinity mechanism can be reused, but ack_APIC_irq() does not handle that. Adding this to ack_APIC_irq() is not possible, because that function is also used for exceptions and directly handled interrupts like IPIs.
Create a new function, which just contains the conditional invocation of irq_move_irq() and the final ack_APIC_irq().
Reuse the new function in apic_ack_edge().
Preparatory change for the real fix.
Fixes: dccfe3147b42 ("x86/vector: Simplify vector move cleanup") Signed-off-by: Thomas Gleixner tglx@linutronix.de Tested-by: Song Liu songliubraving@fb.com Cc: Joerg Roedel jroedel@suse.de Cc: Peter Zijlstra peterz@infradead.org Cc: Song Liu liu.song.a23@gmail.com Cc: Dmitry Safonov 0x7f454c46@gmail.com Cc: stable@vger.kernel.org Cc: Mike Travis mike.travis@hpe.com Cc: Borislav Petkov bp@alien8.de Cc: Tariq Toukan tariqt@mellanox.com Link: https://lkml.kernel.org/r/20180604162224.471925894@linutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/include/asm/apic.h | 2 ++ arch/x86/kernel/apic/vector.c | 9 +++++++-- 2 files changed, 9 insertions(+), 2 deletions(-)
--- a/arch/x86/include/asm/apic.h +++ b/arch/x86/include/asm/apic.h @@ -436,6 +436,8 @@ static inline void apic_set_eoi_write(vo
#endif /* CONFIG_X86_LOCAL_APIC */
+extern void apic_ack_irq(struct irq_data *data); + static inline void ack_APIC_irq(void) { /* --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -809,13 +809,18 @@ static int apic_retrigger_irq(struct irq return 1; }
-void apic_ack_edge(struct irq_data *irqd) +void apic_ack_irq(struct irq_data *irqd) { - irq_complete_move(irqd_cfg(irqd)); irq_move_irq(irqd); ack_APIC_irq(); }
+void apic_ack_edge(struct irq_data *irqd) +{ + irq_complete_move(irqd_cfg(irqd)); + apic_ack_irq(irqd); +} + static struct irq_chip lapic_controller = { .name = "APIC", .irq_ack = apic_ack_edge,