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From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>, linux-kbuild@vger.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
	linuxppc-dev@lists.ozlabs.org
Subject: Re: [v5, 1/4] powerpc/kbuild: set default generic machine type for 32-bit compile
Date: Tue,  5 Jun 2018 00:11:23 +1000 (AEST)	[thread overview]
Message-ID: <40zxgc4r2sz9s4b@ozlabs.org> (raw)
In-Reply-To: <20180530121922.22122-2-npiggin@gmail.com>

On Wed, 2018-05-30 at 12:19:19 UTC, Nicholas Piggin wrote:
> Some 64-bit toolchains uses the wrong ISA variant for compiling 32-bit
> kernels, even with -m32. Debian's powerpc64le is one such case, and
> that is because it is built with --with-cpu=power8.
> 
> So when cross compiling a 32-bit kernel with a 64-bit toolchain, set
> -mcpu=powerpc initially, which is the generic 32-bit powerpc machine
> type and scheduling model. CPU and platform code can override this
> with subsequent -mcpu flags if necessary.
> 
> This is not done for 32-bit toolchains otherwise it would override
> their defaults, which are presumably set appropriately for the
> environment (moreso than a 64-bit cross compiler).
> 
> This fixes a lot of build failures due to incompatible assembly when
> compiling 32-bit kernel with th Debian powerpc64le 64-bit toolchain.
> 
> Cc: Segher Boessenkool <segher@kernel.crashing.org>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/4bf4f42a2febb449a5cc5d79e7c58e

cheers

WARNING: multiple messages have this Message-ID (diff)
From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Nicholas Piggin <npiggin@gmail.com>, linux-kbuild@vger.kernel.org
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>,
	linuxppc-dev@lists.ozlabs.org,
	Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [v5, 1/4] powerpc/kbuild: set default generic machine type for 32-bit compile
Date: Tue,  5 Jun 2018 00:11:23 +1000 (AEST)	[thread overview]
Message-ID: <40zxgc4r2sz9s4b@ozlabs.org> (raw)
In-Reply-To: <20180530121922.22122-2-npiggin@gmail.com>

On Wed, 2018-05-30 at 12:19:19 UTC, Nicholas Piggin wrote:
> Some 64-bit toolchains uses the wrong ISA variant for compiling 32-bit
> kernels, even with -m32. Debian's powerpc64le is one such case, and
> that is because it is built with --with-cpu=power8.
> 
> So when cross compiling a 32-bit kernel with a 64-bit toolchain, set
> -mcpu=powerpc initially, which is the generic 32-bit powerpc machine
> type and scheduling model. CPU and platform code can override this
> with subsequent -mcpu flags if necessary.
> 
> This is not done for 32-bit toolchains otherwise it would override
> their defaults, which are presumably set appropriately for the
> environment (moreso than a 64-bit cross compiler).
> 
> This fixes a lot of build failures due to incompatible assembly when
> compiling 32-bit kernel with th Debian powerpc64le 64-bit toolchain.
> 
> Cc: Segher Boessenkool <segher@kernel.crashing.org>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/4bf4f42a2febb449a5cc5d79e7c58e

cheers

  parent reply	other threads:[~2018-06-04 14:11 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-30 12:19 [PATCH v5 0/4] powerpc patches for new Kconfig language Nicholas Piggin
2018-05-30 12:19 ` [PATCH v5 1/4] powerpc/kbuild: set default generic machine type for 32-bit compile Nicholas Piggin
2018-05-30 14:30   ` Masahiro Yamada
2018-05-30 14:32   ` Masahiro Yamada
2018-06-04 14:11   ` Michael Ellerman [this message]
2018-06-04 14:11     ` [v5, " Michael Ellerman
2018-05-30 12:19 ` [PATCH v5 2/4] powerpc/kbuild: remove CROSS32 defines from top level powerpc Makefile Nicholas Piggin
2018-06-04 14:11   ` [v5, " Michael Ellerman
2018-06-04 14:11     ` Michael Ellerman
2018-05-30 12:19 ` [PATCH v5 3/4] powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS Nicholas Piggin
2018-05-30 14:34   ` Masahiro Yamada
2018-06-04 14:11   ` [v5, " Michael Ellerman
2018-06-04 14:11     ` Michael Ellerman
2018-05-30 12:19 ` [PATCH v5 4/4] powerpc/kbuild: move -mprofile-kernel check to Kconfig Nicholas Piggin
2018-05-30 14:39 ` [PATCH v5 0/4] powerpc patches for new Kconfig language Michael Ellerman
2018-05-30 14:39   ` Michael Ellerman
2018-05-30 14:57   ` Masahiro Yamada
2018-05-31  4:31     ` Michael Ellerman
2018-05-31  5:00       ` Masahiro Yamada
2018-05-31 11:51         ` Michael Ellerman
2018-05-31 13:08           ` Masahiro Yamada
2018-06-01 10:34             ` Michael Ellerman
2018-06-01 10:51               ` Masahiro Yamada
2018-06-01 13:22                 ` Michael Ellerman
2018-06-02  4:53                   ` Nicholas Piggin

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