linux-kernel - Re: [PATCH] MIPS: Add comment about CONFIG_MIPS32_O32 in loongson3

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Message-ID: <alpine.DEB.2.21.2103042356150.51127@angie.orcam.me.uk>
Date:   Fri, 5 Mar 2021 00:08:29 +0100 (CET)
From:   "Maciej W. Rozycki" <macro@...am.me.uk>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
cc:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: Re: [PATCH] MIPS: Add comment about CONFIG_MIPS32_O32 in
 loongson3_defconfig when build with Clang

On Thu, 4 Mar 2021, Tiezhu Yang wrote:

> This is a known bug [2] with Clang, as Simon Atanasyan said,
> "There is no plan on support O32 for MIPS64 due to lack of
> resources".

 Huh?  Is that a joke?  From the o32 psABI's point of view a MIPS64 CPU is 
exactly the same as a MIPS32 one (for whatever ISA revision), so there's 
nothing to support there really other than the CPU/ISA name.

 As much as I dislike all the hacks the Clang community seems to come up 
with for the shortcomings of their tool there has to be a saner workaround 
available rather than forcibly disabling support for the o32 ABI with 
CONFIG_64BIT kernels, but the report is missing the compiler invocation 
line triggering the issue (V=1 perhaps?), which should be included with 
any commit description anyway, so I can't suggest anything based on the 
limited information provided.

  Maciej