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| author | Josh Poimboeuf <jpoimboe@redhat.com> | 2017-03-01 12:04:44 -0600 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2017-03-01 20:32:25 +0100 |
| commit | e390f9a9689a42f477a6073e2e7df530a4c1b740 (patch) | |
| tree | 8d065e301c3781e102d04d0ce9051be27fe0df6e /scripts | |
| parent | 55149d06534ae2a7ba5f7a078353deb89b3fe891 (diff) | |
| download | lwn-e390f9a9689a42f477a6073e2e7df530a4c1b740.tar.gz lwn-e390f9a9689a42f477a6073e2e7df530a4c1b740.zip | |
objtool, modules: Discard objtool annotation sections for modules
The '__unreachable' and '__func_stack_frame_non_standard' sections are
only used at compile time. They're discarded for vmlinux but they
should also be discarded for modules.
Since this is a recurring pattern, prefix the section names with
".discard.". It's a nice convention and vmlinux.lds.h already discards
such sections.
Also remove the 'a' (allocatable) flag from the __unreachable section
since it doesn't make sense for a discarded section.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Fixes: d1091c7fa3d5 ("objtool: Improve detection of BUG() and other dead ends")
Link: http://lkml.kernel.org/r/20170301180444.lhd53c5tibc4ns77@treble
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/mod/modpost.c | 1 | ||||
| -rw-r--r-- | scripts/module-common.lds | 5 |
2 files changed, 5 insertions, 1 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c index 4dedd0d3d3a7..30d752a4a6a6 100644 --- a/scripts/mod/modpost.c +++ b/scripts/mod/modpost.c @@ -854,6 +854,7 @@ static const char *const section_white_list[] = ".cmem*", /* EZchip */ ".fmt_slot*", /* EZchip */ ".gnu.lto*", + ".discard.*", NULL }; diff --git a/scripts/module-common.lds b/scripts/module-common.lds index 73a2c7da0e55..cf7e52e4781b 100644 --- a/scripts/module-common.lds +++ b/scripts/module-common.lds @@ -4,7 +4,10 @@ * combine them automatically. */ SECTIONS { - /DISCARD/ : { *(.discard) } + /DISCARD/ : { + *(.discard) + *(.discard.*) + } __ksymtab 0 : { *(SORT(___ksymtab+*)) } __ksymtab_gpl 0 : { *(SORT(___ksymtab_gpl+*)) } |