linux-kernel - Re: [PATCH] perf tools: fix type mismatch

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Date:	Mon, 15 Sep 2014 10:26:01 +0000
From:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>
To:	"acme@...stprotocols.net" <acme@...stprotocols.net>,
	"jolsa@...nel.org" <jolsa@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dev@...yps.com" <dev@...yps.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"acme@...hat.com" <acme@...hat.com>, "bp@...e.de" <bp@...e.de>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>
Subject: Re: [PATCH] perf tools: fix type mismatch - long vs __statfs_word

Hi Arnaldo, Jiri,

> On Wednesday 13 August 2014 10:34 PM, Alexey Brodkin wrote:
> > From "include/uapi/asm-generic/statfs.h" it is seen that "statfs.f_type" is of
> > type "__statfs_word" which in its turn is "__u32" (unsigned int) for 32-bit
> > systems.
> >
> > So in case of compilation with "-Werror" following breakage happens:
> > --->---
> > fs.c: In function ‘fs__valid_mount’:
> > fs.c:76:24: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
> >   else if (st_fs.f_type != magic)
> >                         ^
> > cc1: all warnings being treated as errors
> > --->---
> >
> > Note that now when fs.c is in "lib/api/fs" and in "tools/lib/api/Makefile"
> > CFLAGS has hard-coded "-Werror" this is inevitable even if one builds "perf"
> > with "WERROR=0".
> >

I'm wondering if there's a chance to get this patch accepted because for
now perf building from 3.15 kernels onward is broken.

Regards,
Alexey