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authorMasahiro Yamada <masahiroy@kernel.org>2020-06-01 14:57:11 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2020-06-06 23:38:12 +0900
commit269a535ca931b754a40dda3ab60514e68773c759 (patch)
treec611f2b2d48fd1f79ba0b58ea2295af297222db1 /Makefile
parentf1005b30ade716eb9286613aeb1d33b5c7852a91 (diff)
downloadlinux-269a535ca931b754a40dda3ab60514e68773c759.tar.bz2
modpost: generate vmlinux.symvers and reuse it for the second modpost
The full build runs modpost twice, first for vmlinux.o and second for modules. The first pass dumps all the vmlinux symbols into Module.symvers, but the second pass parses vmlinux again instead of reusing the dump file, presumably because it needs to avoid accumulating stale symbols. Loading symbol info from a dump file is faster than parsing an ELF object. Besides, modpost deals with various issues to parse vmlinux in the second pass. A solution is to make the first pass dumps symbols into a separate file, vmlinux.symvers. The second pass reads it, and parses module .o files. The merged symbol information is dumped into Module.symvers in the same way as before. This makes further modpost cleanups possible. Also, it fixes the problem of 'make vmlinux', which previously overwrote Module.symvers, throwing away module symbols. I slightly touched scripts/link-vmlinux.sh so that vmlinux is re-linked when you cross this commit. Otherwise, vmlinux.symvers would not be generated. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'Makefile')
-rw-r--r--Makefile2
1 files changed, 1 insertions, 1 deletions
diff --git a/Makefile b/Makefile
index b0bbf8453b66..9768140f8d5a 100644
--- a/Makefile
+++ b/Makefile
@@ -1416,7 +1416,7 @@ endif # CONFIG_MODULES
# make distclean Remove editor backup files, patch leftover files and the like
# Directories & files removed with 'make clean'
-CLEAN_FILES += include/ksym \
+CLEAN_FILES += include/ksym vmlinux.symvers \
modules.builtin modules.builtin.modinfo modules.nsdeps
# Directories & files removed with 'make mrproper'