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| author | Rasmus Villemoes <linux@rasmusvillemoes.dk> | 2021-03-05 10:27:07 +0100 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2021-04-24 22:12:26 +0200 |
| commit | 5cc1247204616528b427e276c97c5bc4c9612347 (patch) | |
| tree | eba8bcc358486f5d2a030ef1742e52849e2019a5 /lib | |
| parent | kbuild: show warning if 'make headers_check' is used (diff) | |
| download | linux-5cc1247204616528b427e276c97c5bc4c9612347.tar.xz linux-5cc1247204616528b427e276c97c5bc4c9612347.zip | |
kbuild: add CONFIG_VMLINUX_MAP expert option
It can be quite useful to have ld emit a link map file, in order to
debug or verify that special sections end up where they are supposed
to, and to see what LD_DEAD_CODE_DATA_ELIMINATION manages to get rid
of.
The only reason I'm not just adding this unconditionally is that the
.map file can be rather large (several MB), and that's a waste of
space when one isn't interested in these things. Also make it depend
on CONFIG_EXPERT.
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 2779c29d9981..b479ae609a31 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -449,6 +449,16 @@ config VMLINUX_VALIDATION depends on STACK_VALIDATION && DEBUG_ENTRY && !PARAVIRT default y +config VMLINUX_MAP + bool "Generate vmlinux.map file when linking" + depends on EXPERT + help + Selecting this option will pass "-Map=vmlinux.map" to ld + when linking vmlinux. That file can be useful for verifying + and debugging magic section games, and for seeing which + pieces of code get eliminated with + CONFIG_LD_DEAD_CODE_DATA_ELIMINATION. + config DEBUG_FORCE_WEAK_PER_CPU bool "Force weak per-cpu definitions" depends on DEBUG_KERNEL |