path: root/scripts/
diff options
authorMasahiro Yamada <>2021-02-11 15:14:16 +0900
committerMasahiro Yamada <>2021-02-12 03:02:21 +0900
commit29500f15b54b63ad0ea60b58e85144262bd24df2 (patch)
tree07fa6b1a005b09e3c66b1fbbbbc72246907ed33e /scripts/
parent92bf22614b21a2706f4993b278017e437f7785b3 (diff)
kbuild: fix CONFIG_TRIM_UNUSED_KSYMS build for ppc64
Stephen Rothwell reported a build error on ppc64 when CONFIG_TRIM_UNUSED_KSYMS is enabled. Jessica Yu pointed out the cause of the error with the reference to the ppc64 ELF ABI: "Symbol names with a dot (.) prefix are reserved for holding entry point addresses. The value of a symbol named ".FN", if it exists, is the entry point of the function "FN". As it turned out, CONFIG_TRIM_UNUSED_KSYMS has never worked for ppc64, but this issue has been unnoticed until recently because this option depends on !UNUSED_SYMBOLS hence is disabled by all{mod,yes}config. (Then, it was uncovered by another patch removing UNUSED_SYMBOLS.) Removing the dot prefix in scripts/ fixes the issue. Please note it must be done before 'sort -u' because modules have both ._mcount and _mcount undefined when CONFIG_FUNCTION_TRACER=y. Link: Reported-by: Stephen Rothwell <> Signed-off-by: Masahiro Yamada <> Tested-by: Jessica Yu <>
Diffstat (limited to 'scripts/')
1 files changed, 3 insertions, 0 deletions
diff --git a/scripts/ b/scripts/
index 16c0b2ddaa4c..d54dfba15bf2 100755
--- a/scripts/
+++ b/scripts/
@@ -43,6 +43,9 @@ EOT
sed 's/ko$/mod/' $modlist |
xargs -n1 sed -n -e '2{s/ /\n/g;/^$/!p;}' -- |
cat - "$ksym_wl" |
+# Remove the dot prefix for ppc64; symbol names with a dot (.) hold entry
+# point addresses.
+sed -e 's/^\.//' |
sort -u |
sed -e 's/\(.*\)/#define __KSYM_\1 1/' >> "$output_file"