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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>
This commit is contained in:
Brian Gerst 2010-10-27 01:43:02 -04:00 committed by Ingo Molnar
parent 610470ce80
commit 22d4cd4c4d
3 changed files with 2 additions and 13 deletions
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2
arch/x86/include/asm/irq.h
View File

@ -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

12
arch/x86/kernel/irq_32.c
View File

@ -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;

1
arch/x86/kernel/smpboot.c
View File

@ -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();