Compiling 2.6.19-rc6 with gcc version 4.1.0 (SUSE Linux),
wait_hpet_tick is optimized away to a never ending loop and the kernel
hangs on boot in timer setup.
0000001a <wait_hpet_tick>:
1a: 55 push %ebp
1b: 89 e5 mov %esp,%ebp
1d: eb fe jmp 1d <wait_hpet_tick+0x3>
This is not a problem with gcc 3.3.5. Adding barrier() calls to
wait_hpet_tick does not help, making the variables volatile does.
Signed-off-by: Keith Owens <[email protected]>
---
arch/i386/kernel/time_hpet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: linux-2.6/arch/i386/kernel/time_hpet.c
===================================================================
--- linux-2.6.orig/arch/i386/kernel/time_hpet.c
+++ linux-2.6/arch/i386/kernel/time_hpet.c
@@ -51,7 +51,7 @@ static void hpet_writel(unsigned long d,
*/
static void __devinit wait_hpet_tick(void)
{
- unsigned int start_cmp_val, end_cmp_val;
+ unsigned volatile int start_cmp_val, end_cmp_val;
start_cmp_val = hpet_readl(HPET_T0_CMP);
do {
-
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