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authorBrian Gerst <brgerst@gmail.com>2010-10-27 01:43:02 -0400
committerIngo Molnar <mingo@elte.hu>2010-10-27 17:31:42 +0200
commit22d4cd4c4dce6d7b7d9a7e396aa4f87fe7a649b1 (patch)
treee36fc7533bd2802ad24b54f6bf2cf68fa8490786 /arch/x86
parent610470ce804f0326ca63fbcdc5be06b750debeb1 (diff)
downloadlinux-22d4cd4c4dce6d7b7d9a7e396aa4f87fe7a649b1.tar.bz2
x86-32: Allocate irq stacks seperate from percpu area
The percpu allocator cannot handle alignments larger than one page. Allocate the irq stacks seperately, and only keep the pointers as percpu data. Signed-off-by: Brian Gerst <brgerst@gmail.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: tj@kernel.org LKML-Reference: <1288158182-1753-1-git-send-email-brgerst@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/irq.h2
-rw-r--r--arch/x86/kernel/irq_32.c12
-rw-r--r--arch/x86/kernel/smpboot.c1
3 files changed, 2 insertions, 13 deletions
diff --git a/arch/x86/include/asm/irq.h b/arch/x86/include/asm/irq.h
index 0bf5b0083650..13b0ebaa512f 100644
--- a/arch/x86/include/asm/irq.h
+++ b/arch/x86/include/asm/irq.h
@@ -21,10 +21,8 @@ static inline int irq_canonicalize(int irq)
#ifdef CONFIG_X86_32
extern void irq_ctx_init(int cpu);
-extern void irq_ctx_exit(int cpu);
#else
# define irq_ctx_init(cpu) do { } while (0)
-# define irq_ctx_exit(cpu) do { } while (0)
#endif
#define __ARCH_HAS_DO_SOFTIRQ
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 50fbbe60e507..64668dbf00a4 100644
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -60,9 +60,6 @@ union irq_ctx {
static DEFINE_PER_CPU(union irq_ctx *, hardirq_ctx);
static DEFINE_PER_CPU(union irq_ctx *, softirq_ctx);
-static DEFINE_PER_CPU_MULTIPAGE_ALIGNED(union irq_ctx, hardirq_stack, THREAD_SIZE);
-static DEFINE_PER_CPU_MULTIPAGE_ALIGNED(union irq_ctx, softirq_stack, THREAD_SIZE);
-
static void call_on_stack(void *func, void *stack)
{
asm volatile("xchgl %%ebx,%%esp \n"
@@ -128,7 +125,7 @@ void __cpuinit irq_ctx_init(int cpu)
if (per_cpu(hardirq_ctx, cpu))
return;
- irqctx = &per_cpu(hardirq_stack, cpu);
+ irqctx = (union irq_ctx *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER);
irqctx->tinfo.task = NULL;
irqctx->tinfo.exec_domain = NULL;
irqctx->tinfo.cpu = cpu;
@@ -137,7 +134,7 @@ void __cpuinit irq_ctx_init(int cpu)
per_cpu(hardirq_ctx, cpu) = irqctx;
- irqctx = &per_cpu(softirq_stack, cpu);
+ irqctx = (union irq_ctx *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER);
irqctx->tinfo.task = NULL;
irqctx->tinfo.exec_domain = NULL;
irqctx->tinfo.cpu = cpu;
@@ -150,11 +147,6 @@ void __cpuinit irq_ctx_init(int cpu)
cpu, per_cpu(hardirq_ctx, cpu), per_cpu(softirq_ctx, cpu));
}
-void irq_ctx_exit(int cpu)
-{
- per_cpu(hardirq_ctx, cpu) = NULL;
-}
-
asmlinkage void do_softirq(void)
{
unsigned long flags;
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 6af118511b4a..90baf567bbf7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1373,7 +1373,6 @@ void play_dead_common(void)
{
idle_task_exit();
reset_lazy_tlbstate();
- irq_ctx_exit(raw_smp_processor_id());
c1e_remove_cpu(raw_smp_processor_id());
mb();