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authorThomas Gleixner <tglx@linutronix.de>2015-08-02 20:38:27 +0000
committerThomas Gleixner <tglx@linutronix.de>2015-08-06 00:14:59 +0200
commita782a7e46bb50822fabfeb7271605762a59c86df (patch)
treea1b4d1798fc5b87f255716f07a170795cf5d5600 /arch/x86/lguest
parentf61ae4fb66a4f7ae49e3456003fc4328d6db09c9 (diff)
downloadlinux-a782a7e46bb50822fabfeb7271605762a59c86df.tar.bz2
x86/irq: Store irq descriptor in vector array
We can spare the irq_desc lookup in the interrupt entry code if we store the descriptor pointer in the vector array instead the interrupt number. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Bjorn Helgaas <bhelgaas@google.com> Link: http://lkml.kernel.org/r/20150802203609.717724106@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/lguest')
-rw-r--r--arch/x86/lguest/boot.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 2165f45befff..47071a08bfa6 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -843,6 +843,7 @@ static struct irq_chip lguest_irq_controller = {
*/
static int lguest_setup_irq(unsigned int irq)
{
+ struct irq_desc *desc;
int err;
/* Returns -ve error or vector number. */
@@ -858,7 +859,8 @@ static int lguest_setup_irq(unsigned int irq)
handle_level_irq, "level");
/* Some systems map "vectors" to interrupts weirdly. Not us! */
- __this_cpu_write(vector_irq[FIRST_EXTERNAL_VECTOR + irq], irq);
+ desc = irq_to_desc(irq);
+ __this_cpu_write(vector_irq[FIRST_EXTERNAL_VECTOR + irq], desc);
return 0;
}