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authorJan Beulich <JBeulich@suse.com>2014-11-03 08:39:43 +0000
committerThomas Gleixner <tglx@linutronix.de>2014-12-16 14:08:14 +0100
commit2414e021ac8d588f1b09f64891f69a3e26feadf1 (patch)
treeb74763cf043cd03720f371141a0a77c3baf6369f /arch/x86/lguest
parente10679825924580845c4825deaaddf5331ff627c (diff)
x86: Avoid building unused IRQ entry stubs
When X86_LOCAL_APIC (i.e. unconditionally on x86-64), first_system_vector will never end up being higher than LOCAL_TIMER_VECTOR (0xef), and hence building stubs for vectors 0xef...0xff is pointlessly reducing code density. Deal with this at build time already. Taking into consideration that X86_64 implies X86_LOCAL_APIC, also simplify (and hence make easier to read and more consistent with the change done here) some #if-s in arch/x86/kernel/irqinit.c. While we could further improve the packing of the IRQ entry stubs (the four ones now left in the last set could be fit into the four padding bytes each of the final four sets have) this doesn't seem to provide any real benefit: Both irq_entries_start and common_interrupt getting cache line aligned, eliminating the 30th set would just produce 32 bytes of padding between the 29th and common_interrupt. [ tglx: Folded lguest fix from Dan Carpenter ] Signed-off-by: Jan Beulich <jbeulich@suse.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: lguest@lists.ozlabs.org Cc: Rusty Russell <rusty@rustcorp.com.au> Link: http://lkml.kernel.org/r/54574D5F0200007800044389@mail.emea.novell.com Link: http://lkml.kernel.org/r/20141115185718.GB6530@mwanda Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/lguest')
-rw-r--r--arch/x86/lguest/boot.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index aae94132bc24..c1c1544b8485 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -841,7 +841,7 @@ static void __init lguest_init_IRQ(void)
{
unsigned int i;
- for (i = FIRST_EXTERNAL_VECTOR; i < NR_VECTORS; i++) {
+ for (i = FIRST_EXTERNAL_VECTOR; i < FIRST_SYSTEM_VECTOR; i++) {
/* Some systems map "vectors" to interrupts weirdly. Not us! */
__this_cpu_write(vector_irq[i], i - FIRST_EXTERNAL_VECTOR);
if (i != SYSCALL_VECTOR)