linux-kernel - Re: [PATCH 1/2] Add thread_info_cache

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Date:	Wed, 21 May 2008 16:38:20 -0400
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-Arch <linux-arch@...r.kernel.org>,
	linux-m32r@...linux-m32r.org, takata@...ux-m32r.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	Paul Mackerras <paulus@...ba.org>,
	Luke Browning <LukeBrowning@...ibm.com>
Subject: Re: [PATCH 1/2] Add thread_info_cache_init() to all archs


On Wed, 2008-05-21 at 21:06 +0200, Sam Ravnborg wrote:
> It was discussed to add some run-time checks for this issue.
> But the examples given were a bit fluffy so I never integrated
> anything
> i kbuild to detect this.
> 
> As this is only a bug for const weak functions they could be made
> non-const
> if they are seldomly used?

With the asm("") trick ?

I suppose, but I'm also happy to just reject the bad gcc...

It shouldn't be too hard to do a test case made of 2 files.

test_foo.c

int foo(void)
{
	printf("good\n");
}

test_bar.c

int foo(void) __weak
{
}

int main(void)
{
	foo();
	return 0;
}

And check for "good" in the output of said program..

Can somebody test that ? Luke, you have a broken compiler, can you make
up some test that could be integrated in the kernel build system
easily ?

(I'm travelling right now, no time to play much with it myself).

Cheers,
Ben.


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