Hi Kees, On Thu, May 16, 2019 at 1:20 AM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > On Wed, May 15, 2019 at 04:53:15PM +0900, Masahiro Yamada wrote: > > On Wed, May 15, 2019 at 4:40 PM Masahiro Yamada > > <yamada.masahiro@xxxxxxxxxxxxx> wrote: > > > > > > 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 occasionally shows up with > > > obscure error message when this kind of race occurs. > > > > > > It is not trivial to catch this potential issue by eyes. > > > > > > Hence, this script. > > > > > > I compile-tested allmodconfig for the latest kernel as of writing, > > > it detected the following: > > > > > > warning: same basename '88pm800.ko' if the following are built as modules: > > > drivers/regulator/88pm800.ko > > > drivers/mfd/88pm800.ko > > > warning: same basename 'adv7511.ko' if the following are built as modules: > > > drivers/gpu/drm/bridge/adv7511/adv7511.ko > > > drivers/media/i2c/adv7511.ko > > > warning: same basename 'asix.ko' if the following are built as modules: > > > drivers/net/phy/asix.ko > > > drivers/net/usb/asix.ko > > > warning: same basename 'coda.ko' if the following are built as modules: > > > fs/coda/coda.ko > > > drivers/media/platform/coda/coda.ko > > > warning: same basename 'realtek.ko' if the following are built as modules: > > > drivers/net/phy/realtek.ko > > > drivers/net/dsa/realtek.ko > > > > > > Reported-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> > > > Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> > > > --- > > > > > > > > diff --git a/scripts/modules-check.sh b/scripts/modules-check.sh > > > new file mode 100755 > > > index 000000000000..944e68bd22b0 > > > --- /dev/null > > > +++ b/scripts/modules-check.sh > > > @@ -0,0 +1,18 @@ > > > +#!/bin/sh > > > +# SPDX-License-Identifier: GPL-2.0 > > > + > > > +# Warn if two or more modules have the same basename > > > +check_same_name_modules() > > > +{ > > > + same_name_modules=$(cat modules.order modules.builtin | \ > > > + xargs basename -a | sort | uniq -d) > > While probably it'll never be a problem, just for robustness, I'd add "--" > to the end basename to terminate argument interpretation: > > xargs basename -a -- | sort | ... Sorry for my ignorance, but could you teach me the effect of "--" ? I sometimes use "--" as a separator when there is ambiguity in arguments for example, "git log <revision> -- <path>" In this case, what is intended by "--"? -- Best Regards Masahiro Yamada
