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ARM: Add L2 cache handling to smp boot support 

The page table and secondary data which we're asking the secondary CPU
to make use of has to hit RAM to ensure that the secondary CPU can see
it since it may not be taking part in coherency or cache searches at
this point.

Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-02-12 14:36:24 +00:00
parent d10fca9f39
commit 1027247f6e
1 changed files with 3 additions and 1 deletions
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4
arch/arm/kernel/smp.c
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@ -99,6 +99,7 @@ int __cpuinit __cpu_up(unsigned int cpu)
*pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) | *pmd = __pmd((PHYS_OFFSET & PGDIR_MASK) |
PMD_TYPE_SECT | PMD_SECT_AP_WRITE); PMD_TYPE_SECT | PMD_SECT_AP_WRITE);
flush_pmd_entry(pmd); flush_pmd_entry(pmd);
outer_clean_range(__pa(pmd), __pa(pmd + 1));
/* /*
* We need to tell the secondary core where to find * We need to tell the secondary core where to find
@ -106,7 +107,8 @@ int __cpuinit __cpu_up(unsigned int cpu)
*/ */
secondary_data.stack = task_stack_page(idle) + THREAD_START_SP; secondary_data.stack = task_stack_page(idle) + THREAD_START_SP;
secondary_data.pgdir = virt_to_phys(pgd); secondary_data.pgdir = virt_to_phys(pgd);
wmb(); __cpuc_flush_dcache_area(&secondary_data, sizeof(secondary_data));
outer_clean_range(__pa(&secondary_data), __pa(&secondary_data + 1));
/* /*
* Now bring the CPU into our world. * Now bring the CPU into our world.