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- From: Matt Redfearn <matt.redfearn@imgtec.com>
- Date: Mon, 19 Dec 2016 14:20:57 +0000
- Subject: [PATCH] MIPS: Stack unwinding while on IRQ stack
- Within unwind stack, check if the stack pointer being unwound is within
- the CPU's irq_stack and if so use that page rather than the task's stack
- page.
- Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
- ---
- --- a/arch/mips/kernel/process.c
- +++ b/arch/mips/kernel/process.c
- @@ -32,6 +32,7 @@
- #include <asm/cpu.h>
- #include <asm/dsp.h>
- #include <asm/fpu.h>
- +#include <asm/irq.h>
- #include <asm/msa.h>
- #include <asm/pgtable.h>
- #include <asm/mipsregs.h>
- @@ -507,7 +508,19 @@ EXPORT_SYMBOL(unwind_stack_by_address);
- unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
- unsigned long pc, unsigned long *ra)
- {
- - unsigned long stack_page = (unsigned long)task_stack_page(task);
- + unsigned long stack_page = 0;
- + int cpu;
- +
- + for_each_possible_cpu(cpu) {
- + if (on_irq_stack(cpu, *sp)) {
- + stack_page = (unsigned long)irq_stack[cpu];
- + break;
- + }
- + }
- +
- + if (!stack_page)
- + stack_page = (unsigned long)task_stack_page(task);
- +
- return unwind_stack_by_address(stack_page, sp, pc, ra);
- }
- #endif
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