4.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner tglx@linutronix.de
commit 839b0f1c4ef674cd929a42304c078afca278581a upstream.
To address the EBUSY fail of interrupt affinity settings in case that the previous setting has not been cleaned up yet, use the new apic_ack_irq() function instead of the special uv_ack_apic() implementation which is merily a wrapper around ack_APIC_irq().
Preparatory change for the real fix
Fixes: dccfe3147b42 ("x86/vector: Simplify vector move cleanup") Reported-by: Song Liu liu.song.a23@gmail.com 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: 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/20180604162224.721691398@linutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/x86/platform/uv/uv_irq.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-)
--- a/arch/x86/platform/uv/uv_irq.c +++ b/arch/x86/platform/uv/uv_irq.c @@ -47,11 +47,6 @@ static void uv_program_mmr(struct irq_cf
static void uv_noop(struct irq_data *data) { }
-static void uv_ack_apic(struct irq_data *data) -{ - ack_APIC_irq(); -} - static int uv_set_irq_affinity(struct irq_data *data, const struct cpumask *mask, bool force) @@ -73,7 +68,7 @@ static struct irq_chip uv_irq_chip = { .name = "UV-CORE", .irq_mask = uv_noop, .irq_unmask = uv_noop, - .irq_eoi = uv_ack_apic, + .irq_eoi = apic_ack_irq, .irq_set_affinity = uv_set_irq_affinity, };