linux-kernel - Re: [PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

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Date:   Mon, 11 Jul 2022 11:39:34 -0500
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
Subject: Re: [PATCH v1 1/5] powerpc/32: Do not allow selection of e5500 or e6500 CPUs on PPC32

Hi!

On Mon, Jul 11, 2022 at 04:19:29PM +0200, Christophe Leroy wrote:
> Commit 0e00a8c9fd92 ("powerpc: Allow CPU selection also on PPC32")
> enlarged the CPU selection logic to PPC32 by removing depend to
> PPC64, and failed to restrict that depend to E5500_CPU and E6500_CPU.
> Fortunately that got unnoticed because -mcpu=8540 will override the
> -mcpu=e500mc64 or -mpcu=e6500 as they are ealier, but that's
> fragile and may no be right in the future.

A later -mcpu= always overrides an earlier one.  This is the same as
with all other GCC option flags, and will not change in the future.


Segher