The patch titled
Subject: buildid: stash away kernels build ID on init
has been added to the -mm tree. Its filename is
buildid-stash-away-kernels-build-id-on-init.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/buildid-stash-away-kernels-build-id-on-init.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/buildid-stash-away-kernels-build-id-on-init.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Subject: buildid: stash away kernels build ID on init
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.
Link: https://lkml.kernel.org/r/20210511003845.2429846-4-swboyd@xxxxxxxxxxxx
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Acked-by: Baoquan He <bhe@xxxxxxxxxx>
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: Vivek Goyal <vgoyal@xxxxxxxxxx>
Cc: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Sasha Levin <sashal@xxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/buildid.h | 3 +++
init/main.c | 1 +
lib/buildid.c | 15 +++++++++++++++
3 files changed, 19 insertions(+)
--- a/include/linux/buildid.h~buildid-stash-away-kernels-build-id-on-init
+++ a/include/linux/buildid.h
@@ -10,4 +10,7 @@ int build_id_parse(struct vm_area_struct
__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
--- a/init/main.c~buildid-stash-away-kernels-build-id-on-init
+++ a/init/main.c
@@ -880,6 +880,7 @@ asmlinkage __visible void __init __no_sa
set_task_stack_end_magic(&init_task);
smp_setup_processor_id();
debug_objects_early_init();
+ init_vmlinux_build_id();
cgroup_init_early();
--- a/lib/buildid.c~buildid-stash-away-kernels-build-id-on-init
+++ a/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,
{
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);
+}
_
Patches currently in -mm which might be from swboyd@xxxxxxxxxxxx are
buildid-only-consider-gnu-notes-for-build-id-parsing.patch
buildid-add-api-to-parse-build-id-out-of-buffer.patch
buildid-stash-away-kernels-build-id-on-init.patch
dump_stack-add-vmlinux-build-id-to-stack-traces.patch
module-add-printk-formats-to-add-module-build-id-to-stacktraces.patch
arm64-stacktrace-use-%psb-for-backtrace-printing.patch
x86-dumpstack-use-%psb-%pbb-for-backtrace-printing.patch
scripts-decode_stacktracesh-support-debuginfod.patch
scripts-decode_stacktracesh-silence-stderr-messages-from-addr2line-nm.patch
scripts-decode_stacktracesh-indicate-auto-can-be-used-for-base-path.patch
buildid-mark-some-arguments-const.patch
buildid-fix-kernel-doc-notation.patch
kdump-use-vmlinux_build_id-to-simplify.patch
