diff options
| author | Matt Redfearn <[email protected]> | 2016-12-19 14:20:57 +0000 |
|---|---|---|
| committer | Ralf Baechle <[email protected]> | 2017-01-03 16:34:34 +0100 |
| commit | d42d8d106b0275b027c1e8992c42aecf933436ea (patch) | |
| tree | cf5b3f4a09288a5d2a941a19458bb159cbada948 | |
| parent | fe8bd18ffea5327344d4ec2bf11f47951212abd0 (diff) | |
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 <[email protected]>
Acked-by: Jason A. Donenfeld <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Adam Buchbinder <[email protected]>
Cc: Maciej W. Rozycki <[email protected]>
Cc: Marcin Nowakowski <[email protected]>
Cc: Chris Metcalf <[email protected]>
Cc: James Hogan <[email protected]>
Cc: Paul Burton <[email protected]>
Cc: Jiri Slaby <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/14741/
Signed-off-by: Ralf Baechle <[email protected]>
| -rw-r--r-- | arch/mips/kernel/process.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c index 5142b1dfe8a7..48e30e0469ef 100644 --- a/arch/mips/kernel/process.c +++ b/arch/mips/kernel/process.c @@ -33,6 +33,7 @@ #include <asm/dsemul.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> @@ -511,7 +512,19 @@ 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 |