linux-kernel - Re: #pragma GCC warnings (was: Re: [PATCH] crypto: drbg

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Message-ID: <20150623092106.GA18791@gondor.apana.org.au>
Date:	Tue, 23 Jun 2015 17:21:06 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Stephan Mueller <smueller@...onox.de>,
	Peter Zijlstra 
	<public-peterz-wegcikhe2lqwvfeawa7xhq@...ne.gmane.org>,
	Andy Shevchenko <andy.shevchenko@...il.com>,
	Jim Davis <jim.epost@...il.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Linux-Next <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, Waiman Long <waiman.long@...com>,
	Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>
Subject: Re: #pragma GCC warnings (was: Re: [PATCH] crypto: drbg - use
 pragmas for disabling optimization)

On Tue, Jun 23, 2015 at 11:17:23AM +0200, Geert Uytterhoeven wrote:
> 
> I get that too with m68k-linux-gcc-4.6.3 and m68k-linux-gcc-4.9.0.
> 
> With m68k-linux-gnu-gcc-4.1, which is still my default cross-compiler due
> to the good unused warning reporting, I get:
> 
> crypto/jitterentropy.c:235: warning: ignoring #pragma GCC push_options
> crypto/jitterentropy.c:236: warning: ignoring #pragma GCC optimize
> crypto/jitterentropy.c:266: warning: ignoring #pragma GCC pop_options
> crypto/jitterentropy.c:295: warning: ignoring #pragma GCC push_options
> crypto/jitterentropy.c:296: warning: ignoring #pragma GCC optimize
> crypto/jitterentropy.c:336: warning: ignoring #pragma GCC pop_options
> crypto/jitterentropy.c:385: warning: ignoring #pragma GCC push_options
> crypto/jitterentropy.c:386: warning: ignoring #pragma GCC optimize
> crypto/jitterentropy.c:416: warning: ignoring #pragma GCC pop_options
> crypto/jitterentropy.c:517: warning: ignoring #pragma GCC push_options
> crypto/jitterentropy.c:518: warning: ignoring #pragma GCC optimize
> crypto/jitterentropy.c:580: warning: ignoring #pragma GCC pop_options

Stephan, could you look into moving the relevant functions into
its own file which can then be compiled with -O0? Obviously any
dependency on kernel header files would have to be hidden using
functions outside of this file.

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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