From: Jamie Lokier <jamie@shareable.org>
To: Marc Andre Tanner <mat@brain-dump.org>
Cc: linux-embedded@vger.kernel.org
Subject: Re: [PATCH 7/7] printk: provide a filtering macro for printk
Date: Wed, 2 Sep 2009 00:35:42 +0100 [thread overview]
Message-ID: <20090901233542.GA1321@shareable.org> (raw)
In-Reply-To: <1251844269-12394-8-git-send-email-mat@brain-dump.org>
Marc Andre Tanner wrote:
> + * The check with sizeof(void*) should make sure that we don't operate on
> + * pointers, which the compiler wouldn't be able to optimize out, but only
> + * on string constants.
Take a look at __builtin_constant_p in the GCC manual.
You'll probably find that wrapping the whole of the rest of the
expression (without the sizeof) in __builtin_constant_p is a good
way to know when to depend on the result of the expression.
-- Jamie
next prev parent reply other threads:[~2009-09-01 23:35 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 22:31 [RFC|PATCH] Compile time printk verbosity Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 1/7] printk: introduce CONFIG_PRINTK_VERBOSITY Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 2/7] printk: move printk to the end of the file Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 3/7] printk: introduce printk_unfiltered as an alias to printk Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 4/7] drivers: replace printk with printk_unfiltered Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 5/7] drivers: make macro independent of printk's return value Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 6/7] video/stk-webcam: change use of STK_ERROR Marc Andre Tanner
2009-09-01 22:31 ` [PATCH 7/7] printk: provide a filtering macro for printk Marc Andre Tanner
2009-09-01 23:24 ` Tim Bird
2009-09-01 23:32 ` H Hartley Sweeten
2009-09-02 13:09 ` Marc Andre Tanner
2009-09-02 17:05 ` Tim Bird
2009-09-02 17:31 ` Tim Bird
2009-09-02 18:22 ` H Hartley Sweeten
2009-09-02 18:22 ` H Hartley Sweeten
2009-09-04 14:05 ` Marc Andre Tanner
2009-09-10 9:22 ` Geert Uytterhoeven
2009-09-01 23:35 ` Jamie Lokier [this message]
2009-09-02 9:03 ` Marc Andre Tanner
2009-09-02 9:54 ` Marc Andre Tanner
2009-09-02 11:06 ` Jamie Lokier
2009-09-02 12:25 ` Bill Gatliff
2009-09-02 12:44 ` Marc Andre Tanner
2009-09-02 12:54 ` Mike Frysinger
2009-09-02 14:07 ` Marc Andre Tanner
2009-09-02 14:30 ` Jamie Lokier
2009-09-01 23:37 ` [RFC|PATCH] Compile time printk verbosity Mike Frysinger
2009-09-02 8:57 ` Marc Andre Tanner
2009-09-02 9:11 ` Mike Frysinger
2009-09-02 9:47 ` Marc Andre Tanner
2009-09-02 9:56 ` Mike Frysinger
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