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authorFelix Fietkau <nbd@openwrt.org>2015-10-30 15:20:12 +0000
committerFelix Fietkau <nbd@openwrt.org>2015-10-30 15:20:12 +0000
commit3bbb92772813c7a955d210f0e82ebdedd3183cec (patch)
treecd2af101317782b50e042653366438ecddcea63d /include
parent1cfa2a674757f6ee776436154d2b8d34fb2b1114 (diff)
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build: Allow kernel modules to set build ID debug symbol
This change adds support for specifying a build ID for kernel modules. This is done by setting PKG_BUILD_ID to a hexadecimal string, which will then be passed to the kernel linker. In addition, when this flag is set, the build ID debug symbol (.note.gnu.build-id) will not be stripped from the kernel module. This symbol is exported in sysfs by the kernel (if the kernel is compiled with CONFIG_KALLSYMS) and so can be used to uniquely identify a version of a kernel module in a running kernel. This is useful for keeping track of different versions of a module when doing experiments and development. Modules that specify the build ID will be ~100 bytes larger (depending on the length of the build ID specified). There is no size difference for kernel modules that do not set this variable. Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk> SVN-Revision: 47290
Diffstat (limited to 'include')
-rw-r--r--include/kernel-defaults.mk3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
index 24d26308b1..d37787a44b 100644
--- a/include/kernel-defaults.mk
+++ b/include/kernel-defaults.mk
@@ -11,7 +11,8 @@ KERNEL_MAKEOPTS := -C $(LINUX_DIR) \
ARCH="$(LINUX_KARCH)" \
KBUILD_HAVE_NLS=no \
CONFIG_SHELL="$(BASH)" \
- $(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='')
+ $(if $(findstring c,$(OPENWRT_VERBOSE)),V=1,V='') \
+ $(if $(PKG_BUILD_ID),LDFLAGS_MODULE=--build-id=0x$(PKG_BUILD_ID))
ifdef CONFIG_STRIP_KERNEL_EXPORTS
KERNEL_MAKEOPTS += \