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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-08-02 22:38:27 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-08-06 00:14:59 +0200 |
| commit | a782a7e46bb50822fabfeb7271605762a59c86df (patch) | |
| tree | a1b4d1798fc5b87f255716f07a170795cf5d5600 /arch/x86/lguest/boot.c | |
| parent | genirq: Provide irq_desc_has_action (diff) | |
| download | linux-a782a7e46bb50822fabfeb7271605762a59c86df.tar.xz linux-a782a7e46bb50822fabfeb7271605762a59c86df.zip | |
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/boot.c')
| -rw-r--r-- | arch/x86/lguest/boot.c | 4 |
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; } |