[PATCH v6 10/10] crash_core: skip MEMBLOCK_NODUMP regions when building vmcore ELF header

[Baoquan He]

On 09/02/26 at 03:31pm, Wandun Chen wrote:
> From: Wandun Chen <chenwandun at lixiang.com>
> 
> Reserve regions (for GPU, DSP, ...) carry no data useful for crash
> analysis. Exclude MEMBLOCK_NODUMP regions from the vmcore ELF header to
> reduce vmcore size and capture time. crash_should_skip_region() now also
> returns true for MEMBLOCK_NODUMP.
> 
> Signed-off-by: Wandun Chen <chenwandun at lixiang.com>
> Tested-by: Meijing Zhao <zhaomeijing at lixiang.com>
> ---
>  kernel/crash_core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Acked-by: Baoquan He <baoquan.he at linux.dev>

> 
> diff --git a/kernel/crash_core.c b/kernel/crash_core.c
> index bd64cf585795..b0e618e13588 100644
> --- a/kernel/crash_core.c
> +++ b/kernel/crash_core.c
> @@ -270,10 +270,10 @@ int crash_prepare_elf64_headers(struct crash_mem *mem, int need_kernel_map,
>  	return 0;
>  }
>  
> -/* Exclude NOMAP regions from the vmcore. */
> +/* Exclude NOMAP and NODUMP regions from the vmcore. */
>  static bool crash_should_skip_region(struct memblock_region *reg)
>  {
> -	return memblock_is_nomap(reg);
> +	return memblock_is_nomap(reg) || memblock_is_nodump(reg);
>  }
>  
>  static struct crash_mem *alloc_cmem(unsigned int nr_ranges)
> -- 
> 2.43.0
>