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authorRasmus Villemoes <linux@rasmusvillemoes.dk>2021-03-05 10:27:07 +0100
committerMasahiro Yamada <masahiroy@kernel.org>2021-04-25 05:12:26 +0900
commit5cc1247204616528b427e276c97c5bc4c9612347 (patch)
treeeba8bcc358486f5d2a030ef1742e52849e2019a5 /lib
parent609bbb4de4f85b7ef45d81a88e6b7dfe3bf5ccea (diff)
downloadlinux-5cc1247204616528b427e276c97c5bc4c9612347.tar.gz
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.debug10
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