From b70f4e85bfc4d7000036355b714a92d5c574f1be Mon Sep 17 00:00:00 2001 From: Tony Luck Date: Wed, 30 Jun 2010 10:46:16 -0700 Subject: [PATCH] [IA64] Fix spinaphore down_spin() Typo in down_spin() meant it only read the low 32 bits of the "serve" value, instead of the full 64 bits. This results in the system hanging when the values in ticket/serve get larger than 32-bits. A big enough system running the right test can hit this in a just a few hours. Broken since 883a3acf5b0d4782ac35981227a0d094e8b44850 [IA64] Re-implement spinaphores using ticket lock concepts Reported via IRC by Bjorn Helgaas Signed-off-by: Tony Luck --- arch/ia64/mm/tlb.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/ia64/mm/tlb.c b/arch/ia64/mm/tlb.c index 5dfd916e9ea6..7b3cdc6c6d91 100644 --- a/arch/ia64/mm/tlb.c +++ b/arch/ia64/mm/tlb.c @@ -121,7 +121,7 @@ static inline void down_spin(struct spinaphore *ss) ia64_invala(); for (;;) { - asm volatile ("ld4.c.nc %0=[%1]" : "=r"(serve) : "r"(&ss->serve) : "memory"); + asm volatile ("ld8.c.nc %0=[%1]" : "=r"(serve) : "r"(&ss->serve) : "memory"); if (time_before(t, serve)) return; cpu_relax();