2.4.x: i386/x86_64 bitops clobberings
From: Jan Kiszka
Date: Sun Oct 08 2006 - 17:44:01 EST
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?
Jan
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