2017-01-27 13:32:10 +00:00
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From: Matt Redfearn <matt.redfearn@imgtec.com>
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Date: Mon, 19 Dec 2016 14:20:57 +0000
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Subject: [PATCH] MIPS: Stack unwinding while on IRQ stack
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Within unwind stack, check if the stack pointer being unwound is within
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the CPU's irq_stack and if so use that page rather than the task's stack
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page.
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Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
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---
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--- a/arch/mips/kernel/process.c
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+++ b/arch/mips/kernel/process.c
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@@ -33,6 +33,7 @@
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#include <asm/dsemul.h>
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#include <asm/dsp.h>
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#include <asm/fpu.h>
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+#include <asm/irq.h>
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#include <asm/msa.h>
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#include <asm/pgtable.h>
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#include <asm/mipsregs.h>
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2017-03-12 11:30:30 +00:00
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@@ -556,7 +557,19 @@ EXPORT_SYMBOL(unwind_stack_by_address);
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2017-01-27 13:32:10 +00:00
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unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
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unsigned long pc, unsigned long *ra)
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{
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- unsigned long stack_page = (unsigned long)task_stack_page(task);
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+ unsigned long stack_page = 0;
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+ int cpu;
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+
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+ for_each_possible_cpu(cpu) {
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+ if (on_irq_stack(cpu, *sp)) {
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+ stack_page = (unsigned long)irq_stack[cpu];
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+ break;
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+ }
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+ }
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+
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+ if (!stack_page)
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+ stack_page = (unsigned long)task_stack_page(task);
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+
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return unwind_stack_by_address(stack_page, sp, pc, ra);
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}
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#endif
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