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sh: Fixup 4K irq stacks. 

There was a clobber issue with the register we were saving
the stack in, so we switch to a register that we handle in
the clobber list properly already.

This also follows the x86 changes for allowing the softirq
checks from hardirq context.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2006-11-24 19:46:18 +09:00
parent db9b99d461
commit 1dc41e58a5
1 changed files with 18 additions and 7 deletions
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25
arch/sh/kernel/irq.c
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@ -78,8 +78,8 @@ union irq_ctx {
u32 stack[THREAD_SIZE/sizeof(u32)];
};
static union irq_ctx *hardirq_ctx[NR_CPUS];
static union irq_ctx *softirq_ctx[NR_CPUS];
static union irq_ctx *hardirq_ctx[NR_CPUS] __read_mostly;
static union irq_ctx *softirq_ctx[NR_CPUS] __read_mostly;
#endif
asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
@ -136,17 +136,24 @@ asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
irqctx->tinfo.task = curctx->tinfo.task;
irqctx->tinfo.previous_sp = current_stack_pointer;
/*
* Copy the softirq bits in preempt_count so that the
* softirq checks work in the hardirq context.
*/
irqctx->tinfo.preempt_count =
(irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |
(curctx->tinfo.preempt_count & SOFTIRQ_MASK);
__asm__ __volatile__ (
"mov %0, r4 \n"
"mov r15, r9 \n"
"mov r15, r8 \n"
"jsr @%1 \n"
/* swith to the irq stack */
" mov %2, r15 \n"
/* restore the stack (ring zero) */
"mov r9, r15 \n"
"mov r8, r15 \n"
: /* no outputs */
: "r" (irq), "r" (generic_handle_irq), "r" (isp)
/* XXX: A somewhat excessive clobber list? -PFM */
: "memory", "r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "r8", "t", "pr"
);
@ -194,7 +201,7 @@ void irq_ctx_init(int cpu)
irqctx->tinfo.task = NULL;
irqctx->tinfo.exec_domain = NULL;
irqctx->tinfo.cpu = cpu;
irqctx->tinfo.preempt_count = SOFTIRQ_OFFSET;
irqctx->tinfo.preempt_count = 0;
irqctx->tinfo.addr_limit = MAKE_MM_SEG(0);
softirq_ctx[cpu] = irqctx;
@ -240,10 +247,14 @@ asmlinkage void do_softirq(void)
"mov r9, r15 \n"
: /* no outputs */
: "r" (__do_softirq), "r" (isp)
/* XXX: A somewhat excessive clobber list? -PFM */
: "memory", "r0", "r1", "r2", "r3", "r4",
"r5", "r6", "r7", "r8", "r9", "r15", "t", "pr"
);
/*
* Shouldnt happen, we returned above if in_interrupt():
*/
WARN_ON_ONCE(softirq_count());
}
local_irq_restore(flags);