On 04/20/21 at 02:49pm, Stephen Boyd wrote:
> Parse the kernel's build ID at initialization so that other code can
> print a hex format string representation of the running kernel's build
> ID. This will be used in the kdump and dump_stack code so that
> developers can easily locate the vmlinux debug symbols for a
> crash/stacktrace.
>
> Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
> Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
> Cc: Jessica Yu <jeyu@xxxxxxxxxx>
> Cc: Evan Green <evgreen@xxxxxxxxxxxx>
> Cc: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
> Cc: Dave Young <dyoung@xxxxxxxxxx>
> Cc: Baoquan He <bhe@xxxxxxxxxx>
> Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
> Cc: <kexec@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
> ---
> include/linux/buildid.h | 3 +++
> init/main.c | 1 +
> lib/buildid.c | 15 +++++++++++++++
> 3 files changed, 19 insertions(+)
>
> diff --git a/include/linux/buildid.h b/include/linux/buildid.h
> index ebce93f26d06..f375900cf9ed 100644
> --- a/include/linux/buildid.h
> +++ b/include/linux/buildid.h
> @@ -10,4 +10,7 @@ int build_id_parse(struct vm_area_struct *vma, unsigned char *build_id,
> __u32 *size);
> int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size);
>
> +extern unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX];
> +void init_vmlinux_build_id(void);
> +
> #endif
> diff --git a/init/main.c b/init/main.c
> index 53b278845b88..eaede2f41327 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -857,6 +857,7 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
> set_task_stack_end_magic(&init_task);
> smp_setup_processor_id();
> debug_objects_early_init();
> + init_vmlinux_build_id();
>
> cgroup_init_early();
>
> diff --git a/lib/buildid.c b/lib/buildid.c
> index 6aea1c4e5e85..1103ed46214f 100644
> --- a/lib/buildid.c
> +++ b/lib/buildid.c
> @@ -1,6 +1,7 @@
> // SPDX-License-Identifier: GPL-2.0
>
> #include <linux/buildid.h>
> +#include <linux/cache.h>
> #include <linux/elf.h>
> #include <linux/kernel.h>
> #include <linux/pagemap.h>
> @@ -172,3 +173,17 @@ int build_id_parse_buf(const void *buf, unsigned char *build_id, u32 buf_size)
> {
> return parse_build_id_buf(build_id, NULL, buf, buf_size);
> }
> +
> +unsigned char vmlinux_build_id[BUILD_ID_SIZE_MAX] __ro_after_init;
> +
> +/**
> + * init_vmlinux_build_id - Compute and stash the running kernel's build ID
> + */
> +void __init init_vmlinux_build_id(void)
> +{
> + extern const void __start_notes __weak;
> + extern const void __stop_notes __weak;
> + unsigned int size = &__stop_notes - &__start_notes;
> +
> + build_id_parse_buf(&__start_notes, vmlinux_build_id, size);
> +}
LGTM, thx.
Acked-by: Baoquan He <bhe@xxxxxxxxxx>
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