From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
To: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
Samuel Holland <samuel@sholland.org>,
Alexey Kardashevskiy <aik@ozlabs.ru>,
linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
Michael Ellerman <mpe@ellerman.id.au>,
"linux-stable # v4 . 20" <stable@vger.kernel.org>,
Michal Marek <michal.lkml@markovi.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] kbuild: mark prepare0 as PHONY to fix external module build
Date: Tue, 15 Jan 2019 09:02:40 +0100 [thread overview]
Message-ID: <CAKv+Gu9qt1HydS7J2q8g6f07XpSgCtRy-vc_shJqknYtAp2u9g@mail.gmail.com> (raw)
In-Reply-To: <1547536740-1572-1-git-send-email-yamada.masahiro@socionext.com>
On Tue, 15 Jan 2019 at 08:20, Masahiro Yamada
<yamada.masahiro@socionext.com> wrote:
>
> Commit c3ff2a5193fa ("powerpc/32: add stack protector support")
> caused kernel panic on PowerPC if an external module is used with
> CONFIG_STACKPROTECTOR because the 'prepare' target was not executed
> for the external module build.
>
> Commit e07db28eea38 ("kbuild: fix single target build for external
> module") turned it into a build error because the 'prepare' target is
> now executed but the 'prepare0' target is missing for the external
> module build.
>
> External module on arm/arm64 with CONFIG_STACKPROTECTOR_PER_TASK is
> also broken in the same way.
>
> Move 'PHONY += prepare0' to the common place. Make is fine with missing
> rule for phony targets.
>
> I minimize the change so it can be easily backported to 4.20.x
>
> To fix v4.20 for external modules of PowerPC, please backport
> e07db28eea38 ("kbuild: fix single target build for external module"),
> and then this commit.
>
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=201891
> Fixes: e07db28eea38 ("kbuild: fix single target build for external module")
> Fixes: c3ff2a5193fa ("powerpc/32: add stack protector support")
> Fixes: 189af4657186 ("ARM: smp: add support for per-task stack canaries")
> Fixes: 0a1213fa7432 ("arm64: enable per-task stack canaries")
> Cc: linux-stable <stable@vger.kernel.org> # v4.20
> Reported-by: Samuel Holland <samuel@sholland.org>
> Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> ---
>
> Makefile | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 499b968..789b332 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -955,6 +955,7 @@ ifdef CONFIG_STACK_VALIDATION
> endif
> endif
>
> +PHONY += prepare0
>
> ifeq ($(KBUILD_EXTMOD),)
> core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
> @@ -1061,8 +1062,7 @@ scripts: scripts_basic scripts_dtc
> # archprepare is used in arch Makefiles and when processed asm symlink,
> # version.h and scripts_basic is processed / created.
>
> -# Listed in dependency order
> -PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
> +PHONY += prepare archprepare prepare1 prepare2 prepare3
>
> # prepare3 is used to check if we are building in a separate output directory,
> # and if so do:
> --
> 2.7.4
>
next prev parent reply other threads:[~2019-01-15 8:02 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 7:19 [PATCH] kbuild: mark prepare0 as PHONY to fix external module build Masahiro Yamada
2019-01-15 8:02 ` Ard Biesheuvel [this message]
2019-01-15 10:33 ` Mathieu Malaterre
2019-01-15 14:58 ` Masahiro Yamada
2019-01-15 10:44 ` Alexey Kardashevskiy
2019-01-15 15:01 ` Masahiro Yamada
2019-01-16 14:33 ` Masahiro Yamada
2019-01-17 13:39 ` Michael Ellerman
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