linux-kernel - Re: [PATCH v2] powerpc: Pass correct CPU reference to assembler

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Message-ID: <20221216171821.GA25951@gate.crashing.org>
Date:   Fri, 16 Dec 2022 11:18:21 -0600
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Jan-Benedict Glaw <jbglaw@...-owl.de>
Subject: Re: [PATCH v2] powerpc: Pass correct CPU reference to assembler

Hi!

On Fri, Dec 16, 2022 at 09:35:50AM +0100, Christophe Leroy wrote:
> The problem comes from the fact that CONFIG_PPC_E500MC is selected for
> both the e500mc (32 bits) and the e5500 (64 bits), and therefore the
> following makefile rule is wrong:
> 
>   cpu-as-$(CONFIG_PPC_E500MC)    += $(call as-option,-Wa$(comma)-me500mc)

Yes.

> Today we have CONFIG_TARGET_CPU which provides the identification of the
> expected CPU, it is used for GCC. Use it as well for the assembler.

Why do you use -Wa, at all for this?  The compiler should already pass
proper options always!

> +cpu-as-$(CONFIG_PPC_BOOK3S_64)	+= $(call as-option,-Wa$(comma)-many)

What is this for?  Using -many is a huge step back, it hides many
problems :-(


Segher