x86-32: Align IRQ stacks properly

As suggested by Steven Rostedt we need to align the IRQ stacks to the
stack size, not just the page size to make them work for stack traces
and other things that depend on finding the stack slot itself with 8k
stacks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
LKML-Reference: <20100727121313.GA19976@lst.de>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c
index 67f5f9f5299feb52b0c3314f10ede5b6b6d1b597..3b5609f54c4b5edba8ada8691e75635b0a1de1b0 100644 (file)
--- a/arch/x86/kernel/irq_32.c
+++ b/arch/x86/kernel/irq_32.c
@@ -55,7 +55,7 @@ static inline void print_stack_overflow(void) { }
 union irq_ctx {
        struct thread_info      tinfo;
        u32                     stack[THREAD_SIZE/sizeof(u32)];
-} __attribute__((aligned(PAGE_SIZE)));
+} __attribute__((aligned(THREAD_SIZE)));
 
 static DEFINE_PER_CPU(union irq_ctx *, hardirq_ctx);
 static DEFINE_PER_CPU(union irq_ctx *, softirq_ctx);