diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/062-02-MIPS-Stack-unwinding-while-on-IRQ-stack.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/062-02-MIPS-Stack-unwinding-while-on-IRQ-stack.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/generic/patches-4.4/062-02-MIPS-Stack-unwinding-while-on-IRQ-stack.patch b/target/linux/generic/patches-4.4/062-02-MIPS-Stack-unwinding-while-on-IRQ-stack.patch new file mode 100644 index 0000000000..513e904e52 --- /dev/null +++ b/target/linux/generic/patches-4.4/062-02-MIPS-Stack-unwinding-while-on-IRQ-stack.patch @@ -0,0 +1,42 @@ +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 |