[PATCH] arm64/crashdump-arm64: align 'Kernel code' with '_stext'

[Simon Horman]

On Wed, May 19, 2021 at 11:16:21AM +0800, Pingfan Liu wrote:
> Since kernel commit e2a073dde921 ("arm64: omit [_text, _stext) from
> permanent kernel mapping"), the physical address of 'Kernel code' in
> /proc/iomem is mapped from _text, instead, from _stext.
> 
> Change the code to cope with this kernel change.
> 
> Signed-off-by: Pingfan Liu <piliu at redhat.com>

Thanks, will kexec still work with older kernels with this change in place?

> ---
>  kexec/arch/arm64/crashdump-arm64.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/kexec/arch/arm64/crashdump-arm64.c b/kexec/arch/arm64/crashdump-arm64.c
> index 38d1a0f..1da663e 100644
> --- a/kexec/arch/arm64/crashdump-arm64.c
> +++ b/kexec/arch/arm64/crashdump-arm64.c
> @@ -148,7 +148,11 @@ static int crash_get_memory_ranges(void)
>  	 * For additional kernel code/data segment.
>  	 * kern_paddr_start/kern_size are determined in iomem_range_callback
>  	 */
> -	elf_info.kern_vaddr_start = get_kernel_sym("_text");
> +	/* Refer to kernel:
> +	 *     kernel_code.start   = __pa_symbol(_stext);
> +	 * which is exported through /proc/iomem as "Kernel code"
> +	 */
> +	elf_info.kern_vaddr_start = get_kernel_sym("_stext");
>  	if (!elf_info.kern_vaddr_start)
>  		elf_info.kern_vaddr_start = UINT64_MAX;
>  
> -- 
> 2.29.2
> 
> 
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