linux-kernel - Re: [PATCH v7 0/5] Update LZ4 compressor module

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Message-ID: <20170210001423.GB25078@bbox>
Date:   Fri, 10 Feb 2017 09:14:23 +0900
From:   Minchan Kim <minchan@...nel.org>
To:     Eric Biggers <ebiggers3@...il.com>
CC:     Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>,
        <akpm@...ux-foundation.org>, <bongkyu.kim@....com>,
        <rsalvaterra@...il.com>, <sergey.senozhatsky@...il.com>,
        <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>,
        <herbert@...dor.apana.org.au>, <davem@...emloft.net>,
        <linux-crypto@...r.kernel.org>, <anton@...msg.org>,
        <ccross@...roid.com>, <keescook@...omium.org>,
        <tony.luck@...el.com>
Subject: Re: [PATCH v7 0/5] Update LZ4 compressor module

Hello Eric,

On Wed, Feb 08, 2017 at 09:24:25PM -0800, Eric Biggers wrote:
> Also I noticed another bug, this time in LZ4_count():
> 
> > #if defined(CONFIG_64BIT)
> > #define LZ4_ARCH64 1
> > #else
> > #define LZ4_ARCH64 0
> > #endif
> ...
> > #ifdef LZ4_ARCH64
> >        if ((pIn < (pInLimit-3))
> >                && (LZ4_read32(pMatch) == LZ4_read32(pIn))) {
> >                pIn += 4; pMatch += 4;
> >        }
> > #endif
> 
> Because of how LZ4_ARCH64 is defined, it needs to be '#if LZ4_ARCH64'.
> 
> But I also think the way upstream LZ4 does 64-bit detection could have just been
> left as-is; it has a function which gets inlined:
> 
> 	static unsigned LZ4_64bits(void) { return sizeof(void*)==8; }
> 

Thanks for looking this.

If you have a fix, could you send a patch? I'm happy to test it.