Hi Jan,
On Sun, Oct 08, 2006 at 11:42:07PM +0200, Jan Kiszka wrote:
> Hi,
>
> after going through debugging hell with some out-of-tree code, I
> realised that this patch
>
> http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=92934bcbf96bc9dc931c40ca5f1a57685b7b813b
>
> makes a difference: current 2.6 works with the following code sequence
> as expected (printk is executed), 2.4 fails.
>
>
> #include <asm/bitops.h>
> #include <linux/module.h>
>
> unsigned long a = 1;
>
> int module_init(void)
> {
> unsigned long b = 0;
> int x;
>
> x = __test_and_set_bit(0, &b);
> if (__test_and_set_bit(0, &a))
> printk("x = %d\n", x);
>
> return -1;
> }
>
>
> There will likely be a way to work around my issue. Nevertheless, I
> wondered if that patch was already considered for 2.4 inclusion. Or is
> there no risk that in-tree code is affected?
While I remember some discussion on the subject for 2.6, I don't
recall anything similiar in 2.4. Wouldn't you happen to build with
gcc-3.4 ? IIRC, the clobbering changed around this version. Could
you confirm that the patch you pointed above fixes the problem for
your case ?
Thanks in advance,
Willy
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