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@xxxxxxxxxx>
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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