From: Christoph Hellwig <hch@lst.de>
Date: Tue, 27 Jul 2010 12:13:13 +0000 (+0200)
Subject: x86-32: Align IRQ stacks properly
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=25897374297906eeebef8864299406bdcb5859c3;p=linux-beck.git

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 67f5f9f5299f..3b5609f54c4b 100644
--- 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);