linux-kernel - Re: [PATCH] kbuild: do not sort after reading modules.order

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Date:   Tue, 13 Dec 2022 10:49:57 +0100
From:   Nicolas Schier <nicolas@...sle.eu>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] kbuild: do not sort after reading modules.order

On Tue, Dec 13, 2022 at 03:41:36PM +0900 Masahiro Yamada wrote:
> On Tue, Dec 13, 2022 at 1:18 PM Nicolas Schier <nicolas@...sle.eu> wrote:
> >
> > On Sun 11 Dec 2022 18:49:18 GMT, Masahiro Yamada wrote:
> > > modules.order lists modules in the deterministic order (that is why
> > > "modules order"), and there is no duplication in the list.
> >
> > Isn't a subdirectory's modules.order just created by
> > concatenation of $(obj-m) (w/ respect to mentioned subdirs)?
> 
> Not $(obj-m) directly.
> 
> The magic is $^, which is a deduplicated list
> of prerequisites.
> 
> 
> > Thus, "no duplication" seems to be true, as long as there is no obj-m
> > containing duplicated entries.  Do we ensure unique entries in obj-m
> > only?
> 
> 
> The entries in modules.order must be unique.
> Moreover, the basename of modules must be unique.
> 
> scripts/modules-check.sh is a stronger check.
> 
> 
> You might be interested in these commits:
> 
> d724b578a1f746db6fc1fd5e4cbba554a855dc8d
> 3a48a91901c516a46a3406ea576798538a8d94d2

ah, thanks!

Reviewed-by: Nicolas Schier <nicolas@...sle.eu>

> > >
> > > $(sort ) is pointless.
> > >
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > > ---
> > >
> > >  scripts/Makefile.modfinal | 2 +-
> > >  scripts/Makefile.modinst  | 2 +-
> > >  2 files changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
> > > index 25bedd83644b..4705d32388f3 100644
> > > --- a/scripts/Makefile.modfinal
> > > +++ b/scripts/Makefile.modfinal
> > > @@ -13,7 +13,7 @@ include $(srctree)/scripts/Kbuild.include
> > >  include $(srctree)/scripts/Makefile.lib
> > >
> > >  # find all modules listed in modules.order
> > > -modules := $(sort $(shell cat $(MODORDER)))
> > > +modules := $(shell cat $(MODORDER))
> > >
> > >  __modfinal: $(modules)
> > >       @:
> > > diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
> > > index a4c987c23750..f4cff42069ad 100644
> > > --- a/scripts/Makefile.modinst
> > > +++ b/scripts/Makefile.modinst
> > > @@ -9,7 +9,7 @@ __modinst:
> > >  include include/config/auto.conf
> > >  include $(srctree)/scripts/Kbuild.include
> > >
> > > -modules := $(sort $(shell cat $(MODORDER)))
> > > +modules := $(shell cat $(MODORDER))
> > >
> > >  ifeq ($(KBUILD_EXTMOD),)
> > >  dst := $(MODLIB)/kernel
> > > --
> > > 2.34.1
> >
> > --
> > epost|xmpp: nicolas@...sle.eu          irc://oftc.net/nsc
> > ↳ gpg: 18ed 52db e34f 860e e9fb  c82b 7d97 0932 55a0 ce7f
> >      -- frykten for herren er opphav til kunnskap --
> 
> 
> 
> -- 
> Best Regards
> Masahiro Yamada

-- 
epost|xmpp: nicolas@...sle.eu          irc://oftc.net/nsc
↳ gpg: 18ed 52db e34f 860e e9fb  c82b 7d97 0932 55a0 ce7f
     -- frykten for herren er opphav til kunnskap --