diff options
| author | Matt Fleming <matt@console-pimps.org> | 2010-03-28 20:08:25 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-04-26 07:41:16 -0700 |
| commit | 69fd993218cadae95f8315ce2ba2df2826f7475f (patch) | |
| tree | b6179c3a35365fe5214fbbd5cb98d8fa71a564d8 /arch/sh | |
| parent | 94aa7e9130a50f65acad20f67a872058001361b3 (diff) | |
sh: Enable the mmu in start_secondary()
commit 4bea3418c737891894b9d3d3e9f8bbd67d66fa38 upstream.
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>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch/sh')
| -rw-r--r-- | arch/sh/kernel/smp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/sh/kernel/smp.c b/arch/sh/kernel/smp.c index 160db1003cfb..71a9c3c47e6f 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; |