From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linux-kbuild@vger.kernel.org,
Masahiro Yamada <yamada.masahiro@socionext.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v2 1/5] powerpc/kbuild: set default generic machine type for 32-bit compile
Date: Thu, 10 May 2018 09:52:35 -0500 [thread overview]
Message-ID: <20180510145235.GP17342@gate.crashing.org> (raw)
In-Reply-To: <20180510051659.15356-2-npiggin@gmail.com>
On Thu, May 10, 2018 at 03:16:55PM +1000, Nicholas Piggin wrote:
> The 64-bit toolchain uses the wrong ISA variant for compiling 32-bit
> kernels, eve with -m32. Set -mcpu=powerpc which is the generic 32-bit
> powerpc machine type and scheduling model. 32-bit platforms and CPUs
> can override this with -mcpu= options that come later on the command
> line.
So it turns out your compiler was configured with --with-cpu=power8;
it's not that GCC defaults are bad, but who built your compiler
overrode the defaults.
If the problem only happens in .S files, it might be better to put
.machine directives in those. But your patch should work too, yes.
Segher
next prev parent reply other threads:[~2018-05-10 14:52 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-10 5:16 [PATCH v2 0/5] kbuild and powerpc patches for new Kconfig language Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 1/5] powerpc/kbuild: set default generic machine type for 32-bit compile Nicholas Piggin
2018-05-10 13:10 ` Segher Boessenkool
2018-05-10 13:24 ` Nicholas Piggin
2018-05-10 14:29 ` Segher Boessenkool
2018-05-10 14:52 ` Segher Boessenkool [this message]
2018-05-10 5:16 ` [PATCH v2 2/5] powerpc/kbuild: remove CROSS32 defines from top level powerpc Makefile Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 3/5] kbuild: call cc-option with the current set of KBUILD_CFLAGS Nicholas Piggin
2018-05-10 5:29 ` Masahiro Yamada
2018-05-10 6:09 ` Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 4/5] powerpc/kbuild: Use flags variables rather than overriding LD/CC/AS Nicholas Piggin
2018-05-10 13:03 ` Michael Ellerman
2018-05-10 13:11 ` Nicholas Piggin
2018-05-10 5:16 ` [PATCH v2 5/5] powerpc/kbuild: move -mprofile-kernel check to Kconfig Nicholas Piggin
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