aboutsummaryrefslogtreecommitdiff
path: root/arch/sh
diff options
context:
space:
mode:
authorMatt Fleming <matt@console-pimps.org>2010-03-28 20:08:25 +0000
committerPaul Mundt <lethal@linux-sh.org>2010-03-29 12:11:51 +0900
commit4bea3418c737891894b9d3d3e9f8bbd67d66fa38 (patch)
treecf3fe1db70b786b26f0b4b7334bfd73565988725 /arch/sh
parentd5ab780305bb6d60a7b5a74f18cf84eb6ad153b1 (diff)
downloadlinux-2.6.34-ux500-4bea3418c737891894b9d3d3e9f8bbd67d66fa38.tar.gz
sh: Enable the mmu in start_secondary()
For the boot, enable_mmu() is called from setup_arch() but we don't call setup_arch() for any of the other cpus. So turn on the non-boot cpu's mmu inside of start_secondary(). I noticed this bug on an SMP board when trying to map I/O memory (smsc911x registers) into the kernel address space. Since the Address Translation bit in MMUCR wasn't set, accessing the virtual address where the smsc911x registers were supposedly mapped actually performed a physical address access. Signed-off-by: Matt Fleming <matt@console-pimps.org> Cc: stable@kernel.org Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh')
-rw-r--r--arch/sh/kernel/smp.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c
index e124cf7008d..002cc612dee 100644
--- a/arch/sh/kernel/smp.c
+++ b/arch/sh/kernel/smp.c
@@ -69,6 +69,7 @@ asmlinkage void __cpuinit start_secondary(void)
unsigned int cpu;
struct mm_struct *mm = &init_mm;
+ enable_mmu();
atomic_inc(&mm->mm_count);
atomic_inc(&mm->mm_users);
current->active_mm = mm;