[PATCH v29 4/9] arm64: kdump: implement machine_crash_shutdown()
Will Deacon
will.deacon at arm.com
Tue Jan 10 03:32:48 PST 2017
On Wed, Dec 28, 2016 at 01:36:01PM +0900, AKASHI Takahiro wrote:
> Primary kernel calls machine_crash_shutdown() to shut down non-boot cpus
> and save registers' status in per-cpu ELF notes before starting crash
> dump kernel. See kernel_kexec().
> Even if not all secondary cpus have shut down, we do kdump anyway.
>
> As we don't have to make non-boot(crashed) cpus offline (to preserve
> correct status of cpus at crash dump) before shutting down, this patch
> also adds a variant of smp_send_stop().
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> Reviewed-by: James Morse <james.morse at arm.com>
> Acked-by: Catalin Marinas <catalin.marinas at arm.com>
> ---
> arch/arm64/include/asm/hardirq.h | 2 +-
> arch/arm64/include/asm/kexec.h | 42 +++++++++++++++++++++++++-
> arch/arm64/include/asm/smp.h | 2 ++
> arch/arm64/kernel/machine_kexec.c | 56 ++++++++++++++++++++++++++++++++--
> arch/arm64/kernel/smp.c | 63 +++++++++++++++++++++++++++++++++++++++
> 5 files changed, 160 insertions(+), 5 deletions(-)
[...]
> diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
> index d050d720a1b4..cea009f2657d 100644
> --- a/arch/arm64/include/asm/smp.h
> +++ b/arch/arm64/include/asm/smp.h
> @@ -148,6 +148,8 @@ static inline void cpu_panic_kernel(void)
> */
> bool cpus_are_stuck_in_kernel(void);
>
> +extern void smp_send_crash_stop(void);
> +
> #endif /* ifndef __ASSEMBLY__ */
>
> #endif /* ifndef __ASM_SMP_H */
> diff --git a/arch/arm64/kernel/machine_kexec.c b/arch/arm64/kernel/machine_kexec.c
> index bc96c8a7fc79..c60346d33bb1 100644
> --- a/arch/arm64/kernel/machine_kexec.c
> +++ b/arch/arm64/kernel/machine_kexec.c
> @@ -9,6 +9,9 @@
> * published by the Free Software Foundation.
> */
>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> #include <linux/kexec.h>
> #include <linux/smp.h>
>
> @@ -22,6 +25,7 @@
> extern const unsigned char arm64_relocate_new_kernel[];
> extern const unsigned long arm64_relocate_new_kernel_size;
>
> +static bool in_crash_kexec;
Do you actually need this bool? Why not call kexec_crash_loaded() instead?
Will
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