Home Home > GIT Browse
summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorMasahiro Yamada <yamada.masahiro@socionext.com>2019-05-18 01:07:15 +0900
committerMasahiro Yamada <yamada.masahiro@socionext.com>2019-05-18 15:35:02 +0900
commit3a48a91901c516a46a3406ea576798538a8d94d2 (patch)
treea32a07c7f6f46a7fd87e6a1a923a93a1b5d9f8e7
parentaff11cd983ec0850651ee9b1c2a88b33358cb2f2 (diff)
kbuild: check uniqueness of module names
In the recent build test of linux-next, Stephen saw a build error caused by a broken .tmp_versions/*.mod file: https://lkml.org/lkml/2019/5/13/991 drivers/net/phy/asix.ko and drivers/net/usb/asix.ko have the same basename, and there is a race in generating .tmp_versions/asix.mod Kbuild has not checked this before, and it suddenly shows up with obscure error messages when this kind of race occurs. Non-unique module names cause various sort of problems, but it is not trivial to catch them by eyes. Hence, this script. It checks not only real modules, but also built-in modules (i.e. controlled by tristate CONFIG option, but currently compiled with =y). Non-unique names for built-in modules also cause problems because /sys/modules/ would fall over. For the latest kernel, I tested "make allmodconfig all" (or more quickly "make allyesconfig modules"), and it detected the following: warning: same basename if the following are built as modules: drivers/regulator/88pm800.ko drivers/mfd/88pm800.ko warning: same basename if the following are built as modules: drivers/gpu/drm/bridge/adv7511/adv7511.ko drivers/media/i2c/adv7511.ko warning: same basename if the following are built as modules: drivers/net/phy/asix.ko drivers/net/usb/asix.ko warning: same basename if the following are built as modules: fs/coda/coda.ko drivers/media/platform/coda/coda.ko warning: same basename if the following are built as modules: drivers/net/phy/realtek.ko drivers/net/dsa/realtek.ko Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
-rw-r--r--Makefile1
-rwxr-xr-xscripts/modules-check.sh16
2 files changed, 17 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index e5414f78e123..1232a1454d5c 100644
--- a/Makefile
+++ b/Makefile
@@ -1288,6 +1288,7 @@ modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
@$(kecho) ' Building modules, stage 2.';
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
+ $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
diff --git a/scripts/modules-check.sh b/scripts/modules-check.sh
new file mode 100755
index 000000000000..2f659530e1ec
--- /dev/null
+++ b/scripts/modules-check.sh
@@ -0,0 +1,16 @@
+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+
+set -e
+
+# Check uniqueness of module names
+check_same_name_modules()
+{
+ for m in $(sed 's:.*/::' modules.order modules.builtin | sort | uniq -d)
+ do
+ echo "warning: same basename if the following are built as modules:" >&2
+ sed "/\/$m/!d;s:^kernel/: :" modules.order modules.builtin >&2
+ done
+}
+
+check_same_name_modules