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kbuild: builddeb - avoid recompiles for non-cross-compiles

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Commit e2c318225a ("kbuild: deb-pkg: add
pkg.linux-upstream.nokernelheaders build profile") changed how
install-extmod-build gets called, making it always rebuild the host
programs below scripts/ if HOSTCC wasn't specified with its full triplet
on the make command line. That is, apparently, needed to fix up commit
f1d87664b8 ("kbuild: cross-compile linux-headers package when
possible") for cross-compiles. However, in the much more common case of
non-cross-compile builds this will lead to unnecessary rebuilding of
host tools including gcc plugins. This, in turn, will lead to a full
kernel rebuild on the next 'make bindeb-pkg' which is unfortunate.

Avoid that by only triggering the rebuild of host tools for actual
cross-compile builds.

Signed-off-by: Mathias Krause <minipli@grsecurity.net>
Fixes: e2c318225a ("kbuild: deb-pkg: add pkg.linux-upstream.nokernelheaders build profile")
Cc: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://patch.msgid.link/20260402145116.1010901-1-minipli@grsecurity.net
Signed-off-by: Nicolas Schier <nsc@kernel.org>
This commit is contained in:
Mathias Krause 2026-04-02 16:51:16 +02:00 committed by Nicolas Schier
parent 028ef9c96e
commit 2452dcf4d7
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GPG Key ID: 07520A7016261269
1 changed files with 7 additions and 1 deletions
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8
scripts/package/builddeb
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@ -139,7 +139,13 @@ install_kernel_headers () {
pdir=debian/$1
version=${1#linux-headers-}
CC="${DEB_HOST_GNU_TYPE}-gcc" "${srctree}/scripts/package/install-extmod-build" "${pdir}/usr/src/linux-headers-${version}"
# Override $CC only for cross-compiles, to not unnecessarily rebuild
# scripts/ including plugins, which may lead to a full kernel rebuild.
if [ -n "${CROSS_COMPILE}" ]; then
CC="${DEB_HOST_GNU_TYPE}-gcc" "${srctree}/scripts/package/install-extmod-build" "${pdir}/usr/src/linux-headers-${version}"
else
"${srctree}/scripts/package/install-extmod-build" "${pdir}/usr/src/linux-headers-${version}"
fi
mkdir -p $pdir/lib/modules/$version/
ln -s /usr/src/linux-headers-$version $pdir/lib/modules/$version/build