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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>
Acked-by: Jason A. Donenfeld <jason@zx2c4.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
Cc: Maciej W. Rozycki <macro@imgtec.com>
Cc: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: Chris Metcalf <cmetcalf@mellanox.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14741/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Matt Redfearn 2016-12-19 14:20:57 +00:00 committed by Ralf Baechle
parent fe8bd18ffe
commit d42d8d106b
1 changed files with 14 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
arch/mips/kernel/process.c
View File

@ -33,6 +33,7 @@
#include <asm/dsemul.h> #include <asm/dsemul.h>
#include <asm/dsp.h> #include <asm/dsp.h>
#include <asm/fpu.h> #include <asm/fpu.h>
#include <asm/irq.h>
#include <asm/msa.h> #include <asm/msa.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
#include <asm/mipsregs.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 unwind_stack(struct task_struct *task, unsigned long *sp,
unsigned long pc, unsigned long *ra) 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); return unwind_stack_by_address(stack_page, sp, pc, ra);
} }
#endif #endif