diff options
| author | David Miller <davem@davemloft.net> | 2007-12-19 16:27:11 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-06 11:43:41 -0800 |
| commit | f63145cd2ee2cba87fb7b61ef7c06c034c889a5a (patch) | |
| tree | 1b946683e8fc67c74a2d1316872a318bc1698f75 | |
| parent | 83f6ef15a3da00b409a334d688a1129f363fd7fc (diff) | |
SPARC64: Fix memory controller register access when non-SMP.
[SPARC64]: Fix memory controller register access when non-SMP.
[ Upstream commit: b332b8bc9c67165eabdfc7d10b4a2e4cc9f937d0 ]
get_cpu() always returns zero on non-SMP builds, but we
really want the physical cpu number in this code in order
to do the right thing.
Based upon a non-SMP kernel boot failure report from Bernd Zeimetz.
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/sparc64/kernel/chmc.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/arch/sparc64/kernel/chmc.c b/arch/sparc64/kernel/chmc.c index 777d34577045..6d4f02e8a4cf 100644 --- a/arch/sparc64/kernel/chmc.c +++ b/arch/sparc64/kernel/chmc.c @@ -1,7 +1,6 @@ -/* $Id: chmc.c,v 1.4 2002/01/08 16:00:14 davem Exp $ - * memctrlr.c: Driver for UltraSPARC-III memory controller. +/* memctrlr.c: Driver for UltraSPARC-III memory controller. * - * Copyright (C) 2001 David S. Miller (davem@redhat.com) + * Copyright (C) 2001, 2007 David S. Miller (davem@davemloft.net) */ #include <linux/module.h> @@ -16,6 +15,7 @@ #include <linux/init.h> #include <asm/spitfire.h> #include <asm/chmctrl.h> +#include <asm/cpudata.h> #include <asm/oplib.h> #include <asm/prom.h> #include <asm/io.h> @@ -242,8 +242,11 @@ int chmc_getunumber(int syndrome_code, */ static u64 read_mcreg(struct mctrl_info *mp, unsigned long offset) { - unsigned long ret; - int this_cpu = get_cpu(); + unsigned long ret, this_cpu; + + preempt_disable(); + + this_cpu = real_hard_smp_processor_id(); if (mp->portid == this_cpu) { __asm__ __volatile__("ldxa [%1] %2, %0" @@ -255,7 +258,8 @@ static u64 read_mcreg(struct mctrl_info *mp, unsigned long offset) : "r" (mp->regs + offset), "i" (ASI_PHYS_BYPASS_EC_E)); } - put_cpu(); + + preempt_enable(); return ret; } |