linux-kernel - Re: [RFC/PATCH] arm64: Rename macro arguments to silence sparse

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Message-ID: <5f7a5bf1-1285-d9c3-b892-c8f9f8ee6d63@codeaurora.org>
Date:   Tue, 7 Feb 2017 12:11:59 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-sparse@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Christopher Li <sparse@...isli.org>
Subject: Re: [RFC/PATCH] arm64: Rename macro arguments to silence sparse

On 02/06/2017 05:50 PM, Luc Van Oostenryck wrote:
> On Mon, Feb 06, 2017 at 05:08:17PM -0800, Stephen Boyd wrote:
>> On 02/06/2017 05:01 PM, Stephen Boyd wrote:
>>> When I compile files with sparse, I get these sorts of warnings:
>>>
>>> arch/arm64/include/asm/lse.h:14:28: warning: Unknown escape 'l'
>>> arch/arm64/include/asm/lse.h:14:37: warning: Unknown escape 'l'
>>> arch/arm64/include/asm/alternative.h:172:28: warning: Unknown escape 'o'
>>>
>>> This is because sparse is trying to tokenize these files and sees
>>> a line like this:
>>>
>>>  alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS
>>>
>>> It gets past alternative_insn part and then sees the start of a
>>> string with the double quote character. So sparse starts to parse
>>> the string (eat_string() in the sparse code) but the string has
>>> an escape character '\' in it. Sparse sees the escape character,
>>> so it checks to see if it's an escape sequence, but '\l' isn't.
>>> This causes sparse to spit out this warning of an unknown escape
>>> sequence 'l'.
>>>
>>> In reality, sparse isn't going to use these macros anyway because
>>> this whole thing is inside an __ASSEMBLER__ ifdef.
> Yes, annoying. Conversion of escaped characters is supposed to be
> done just after preprocessing. It's definitively a bug.

Ok. Thanks for the fixes to sparse. My hack patch can be safely ignored.

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