linux-kernel - Re: [PATCH] tell gcc optimizer to never introduce new data races

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Message-ID: <20140616102927.GA2994@mwanda>
Date:	Mon, 16 Jun 2014 13:29:27 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Martin Jambor <mjambor@...e.cz>, Petr Mladek <pmladek@...e.cz>,
	linux-kernel@...r.kernel.org, gcc@....gnu.org,
	linux-sparse@...r.kernel.org
Subject: Re: [PATCH] tell gcc optimizer to never introduce new data races

Adding "--param allow-store-data-races=0" to the GCC options for the
kernel breaks C=1 because Sparse isn't expecting a GCC option with that
format.

It thinks allow-store-data-races=0 is the name of the file we are trying
to test.  Try use Sparse on linux-next to see the problem.

$ make C=2 mm/slab_common.o
  CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  CALL    scripts/checksyscalls.sh
  CHECK   scripts/mod/empty.c
No such file: allow-store-data-races=0
make[2]: *** [scripts/mod/empty.o] Error 1
make[1]: *** [scripts/mod] Error 2
make: *** [scripts] Error 2
$

regards,
dan carpenter

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