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MIPS: Introduce irq_stack

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Allocate a per-cpu irq stack for use within interrupt handlers.

Also add a utility function on_irq_stack to determine if a given stack
pointer is within the irq stack for that cpu.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Acked-by: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: Petr Mladek <pmladek@suse.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Aaron Tomlin <atomlin@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14740/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Matt Redfearn
2016-12-19 14:20:56 +00:00
committed by Ralf Baechle
parent ae2f5e5ed0
commit fe8bd18ffe
3 changed files with 24 additions and 0 deletions
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12
arch/mips/include/asm/irq.h
View File

@@ -17,6 +17,18 @@
#include <irq.h>
#define IRQ_STACK_SIZE THREAD_SIZE
extern void *irq_stack[NR_CPUS];
static inline bool on_irq_stack(int cpu, unsigned long sp)
{
unsigned long low = (unsigned long)irq_stack[cpu];
unsigned long high = low + IRQ_STACK_SIZE;
return (low <= sp && sp <= high);
}
#ifdef CONFIG_I8259
static inline int irq_canonicalize(int irq)
{