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Date: Mon, 17 Feb 2020 16:34:57 +0000 From: Matthias Maennich <maennich@...gle.com> To: Quentin Perret <qperret@...gle.com> Cc: masahiroy@...nel.org, nico@...xnic.net, linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, kernel-team@...roid.com, jeyu@...nel.org, hch@...radead.org Subject: Re: [PATCH v4 3/3] kbuild: generate autoksyms.h early On Wed, Feb 12, 2020 at 08:21:40PM +0000, Quentin Perret wrote: >When doing a cold build, autoksyms.h starts empty, and is updated late >in the build process to have visibility over the symbols used by in-tree >drivers. But since the symbol whitelist is known upfront, it can be used >to pre-populate autoksyms.h and maximize the amount of code that can be >compiled to its final state in a single pass, hence reducing build time. > >Do this by using gen_autoksyms.sh to initialize autoksyms.h instead of >creating an empty file. > >Signed-off-by: Quentin Perret <qperret@...gle.com> Reviewed-by: Matthias Maennich <maennich@...gle.com> Tested-by: Matthias Maennich <maennich@...gle.com> Cheers, Matthias >--- > Makefile | 7 +++++-- > scripts/gen_autoksyms.sh | 3 ++- > 2 files changed, 7 insertions(+), 3 deletions(-) > >diff --git a/Makefile b/Makefile >index 84b71845c43f..17b7e7f441bd 100644 >--- a/Makefile >+++ b/Makefile >@@ -1062,9 +1062,12 @@ endif > > autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) > >+quiet_cmd_autoksyms_h = GEN $@ >+ cmd_autoksyms_h = mkdir -p $(dir $@); $(CONFIG_SHELL) \ >+ $(srctree)/scripts/gen_autoksyms.sh $@ >+ > $(autoksyms_h): >- $(Q)mkdir -p $(dir $@) >- $(Q)touch $@ >+ $(call cmd,autoksyms_h) > > ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) > >diff --git a/scripts/gen_autoksyms.sh b/scripts/gen_autoksyms.sh >index 2cea433616a8..f52b93ad122c 100755 >--- a/scripts/gen_autoksyms.sh >+++ b/scripts/gen_autoksyms.sh >@@ -32,7 +32,8 @@ cat > "$output_file" << EOT > > EOT > >-sed 's/ko$/mod/' modules.order | >+[ -f modules.order ] && modlist=modules.order || modlist=/dev/null >+sed 's/ko$/mod/' $modlist | > xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- | > cat - "$ksym_wl" | > sort -u | >-- >2.25.0.225.g125e21ebc7-goog >
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