diff options
| author | Daniel Thompson <daniel.thompson@linaro.org> | 2016-08-19 15:53:40 +0100 |
|---|---|---|
| committer | Daniel Thompson <daniel.thompson@linaro.org> | 2017-03-29 17:02:04 +0100 |
| commit | a46a7b3a63c940a31261204180c24432eced16be (patch) | |
| tree | 452518a72fe1b96ae8e1f7434271839cefbc6bbc /arch/arm64/include/asm/smp.h | |
| parent | 0df3e2b7ba9f323aee91bfb9d862899f08dd785c (diff) | |
arm64: Implement IPI_CPU_BACKTRACE using pseudo-NMIs
Recently arm64 gained the capability to (optionally) mask interrupts
using the GIC PMR rather than the CPU PSR. That allows us to introduce
an NMI-like means to handle backtrace requests.
This provides a useful debug aid by allowing the kernel to robustly show
a backtrace for every processor in the system when, for example, we hang
trying to acquire a spin lock.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
Diffstat (limited to 'arch/arm64/include/asm/smp.h')
| -rw-r--r-- | arch/arm64/include/asm/smp.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h index d050d720a1b4..dc00c0056868 100644 --- a/arch/arm64/include/asm/smp.h +++ b/arch/arm64/include/asm/smp.h @@ -35,6 +35,8 @@ #include <linux/cpumask.h> #include <linux/thread_info.h> +#define SMP_IPI_NMI_MASK (1 << 6) + DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number); /* |