Messages in this thread Patch in this message |  | | From | Keith Owens <> | Subject | [patch 2.6.19-rc6] Stop gcc 4.1.0 optimizing wait_hpet_tick away | Date | Wed, 29 Nov 2006 13:22:03 +1100 |
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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 <kaos@ocs.com.au>
--- 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 { - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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