This reverts commit 3f13972470.
Reason for revert: relanding change that should be safe to go in on its own. Below is the original commit message.
BACKPORT: FROMGIT: module: allow UNUSED_KSYMS_WHITELIST to be relative against objtree.
If UNUSED_KSYMS_WHITELIST is a file generated
before Kbuild runs, and the source tree is in
a read-only filesystem, the developer must put
the file somewhere and specify an absolute
path to UNUSED_KSYMS_WHITELIST. This worked,
but if IKCONFIG=y, an absolute path is embedded
into .config and eventually into vmlinux, causing
the build to be less reproducible when building
on a different machine.
This patch makes the handling of
UNUSED_KSYMS_WHITELIST to be similar to
MODULE_SIG_KEY.
First, check if UNUSED_KSYMS_WHITELIST is an
absolute path, just as before this patch. If so,
use the path as is.
If it is a relative path, use wildcard to check
the existence of the file below objtree first.
If it does not exist, fall back to the original
behavior of adding $(srctree)/ before the value.
After this patch, the developer can put the generated
file in objtree, then use a relative path against
objtree in .config, eradicating any absolute paths
that may be evaluated differently on different machines.
Signed-off-by: Yifan Hong <elsk@google.com>
Reviewed-by: Elliot Berman <quic_eberman@quicinc.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
(cherry picked from commit a2e3c811938b4902725e259c03b2d6c539613992
https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux.git modules-next)
Bug: 333769605
Change-Id: I442bbe5a68fc895619b84b4749f1e97cb88088ea
[elsk: apply change to gen_autoksyms.sh instead because
CONFIG_UNUSED_KSYMS_WHITELIST is parsed there. Revert change
to Makefile.modpost.]
Bug: 342390208
Signed-off-by: Yifan Hong <elsk@google.com>
c6427490ab