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| author | Matt Redfearn <matt.redfearn@imgtec.com> | 2016-12-19 14:20:57 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-18 06:59:34 +0200 |
| commit | ece65a60793cc17d212182acc4b6e876511372e6 (patch) | |
| tree | cef80b2c09d64683c78ea32896d9f80791f6077a | |
| parent | 6b720ff376fdd29eb7e2df3b7815159e3dc783ff (diff) | |
| download | linux-stable-ece65a60793cc17d212182acc4b6e876511372e6.tar.gz linux-stable-ece65a60793cc17d212182acc4b6e876511372e6.tar.bz2 linux-stable-ece65a60793cc17d212182acc4b6e876511372e6.zip | |
MIPS: Stack unwinding while on IRQ stack
commit d42d8d106b0275b027c1e8992c42aecf933436ea upstream.
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>
Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 7d80447e5d03..efa1df52c616 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> @@ -556,7 +557,19 @@ 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 |