diff options
| author | Gary King <gking@nvidia.com> | 2010-04-09 15:54:10 -0700 |
|---|---|---|
| committer | Gary King <gking@nvidia.com> | 2010-04-12 18:22:46 -0700 |
| commit | fb32b775fd431c658942102a8e6b77c0cba28829 (patch) | |
| tree | 3675166d26912072c693b18305583082948b3bdd | |
| parent | efb9475cf714c332b2b565a61e76e817f92d677a (diff) | |
[ARM] clean slave processor bootup page tables from L2
by the time that the slave processors' page table pointers are written
to memory, the L1 and L2 caches may already be enabled on the master,
so the writes need to be forcefully cleaned to memory to ensure that
the slave will be able to read it.
patch originally submitted to 2.6.34 by RMK
Change-Id: Id9952149ce17c693775ec2b21e9a0425465fb770
Reviewed-on: http://git-master/r/1067
Reviewed-by: Trivikram Kasivajhula <tkasivajhula@nvidia.com>
Reviewed-by: Scott Williams <scwilliams@nvidia.com>
Reviewed-by: Gary King <gking@nvidia.com>
Tested-by: Gary King <gking@nvidia.com>
| -rw-r--r-- | arch/arm/kernel/smp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 40eff61d6d8e..9fe6d44b1188 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -101,6 +101,7 @@ int __cpuinit __cpu_up(unsigned int cpu) *pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) | PMD_TYPE_SECT | PMD_SECT_AP_WRITE); flush_pmd_entry(pmd); + outer_clean_range(__pa(pmd), __pa(pmd + 1)); /* * We need to tell the secondary core where to find @@ -108,7 +109,8 @@ int __cpuinit __cpu_up(unsigned int cpu) */ secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; secondary_data.pgdir = virt_to_phys(pgd); - wmb(); + __cpuc_coherent_kern_range(&secondary_data, &secondary_data+1); + outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1)); /* * Now bring the CPU into our world. |