在 2021年03月02日 12:38, HAGIO KAZUHITO(萩尾 一仁) 写道:
> Fix "bt" command on Linux 5.12-rc1 and later kernels that contains
> kernel commit 951c2a51ae75 ("x86/irq/64: Adjust the per CPU irq stack
> pointer by 8"). Without the patch, the "bt" command and some options
> that read irq stack fails with the error message "bt: read of stack
> at <address> failed".
>
> Signed-off-by: Kazuhito Hagio <k-hagio-ab@xxxxxxx>
> ---
> x86_64.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/x86_64.c b/x86_64.c
> index 23a40a04bbc4..f5b2f7b5f040 100644
> --- a/x86_64.c
> +++ b/x86_64.c
> @@ -1326,6 +1326,8 @@ x86_64_per_cpu_init(void)
> KVADDR, &hardirq_stack_ptr, sizeof(void *),
> "hardirq_stack_ptr (per_cpu)", QUIET|RETURN_ON_ERROR))
> continue;
> + if (hardirq_stack_ptr != PAGEBASE(hardirq_stack_ptr))
> + hardirq_stack_ptr += 8;
> ms->stkinfo.ibase[i] = hardirq_stack_ptr - ms->stkinfo.isize;
> } else if (irq_sp)
> ms->stkinfo.ibase[i] = irq_sp->value + kt->__per_cpu_offset[i];
>
Looks good. Acked-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
Thanks.
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