[Crash-utility] [PATCH] x86_64: fix "bt" command on 5.12-rc1 and later kernels

[lijiang]

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 at nec.com>
> ---
>  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 at redhat.com>

Thanks.