Commit graph

6 commits

Author SHA1 Message Date
Felix Fietkau
3bbb927728 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
2015-10-30 15:20:12 +00:00
Felix Fietkau
571bd159a1 kernel: fix stripping of modules with duplicate symbol names
SVN-Revision: 31031
2012-03-19 21:09:47 +00:00
Felix Fietkau
7b609a31be kernel: improve profiling support, keep static symbols when profiling is enabled
SVN-Revision: 30964
2012-03-17 13:03:14 +00:00
Felix Fietkau
236dd9d9a2 kernel: keep more symbols in the kernel modules when doing profiling
SVN-Revision: 30762
2012-03-01 15:13:26 +00:00
Felix Fietkau
a8ec8ce1ac kernel: do not rename module symbols with kallsyms enabled
SVN-Revision: 30759
2012-03-01 09:58:03 +00:00
Felix Fietkau
c2590fe930 strip kernel modules more aggressively: make all global symbols local, rename all symbols in the symbol table to make them compress better
SVN-Revision: 30662
2012-02-20 17:38:26 +00:00