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[POWERPC] Cleanup 32-bit map_page 

The 32 bits map_page() function is used internally by the mm code
for early mmu mappings and for ioremap. It should never be called
for an address that already has a valid PTE or hash entry, so we
add a BUG_ON for that and remove the useless flush_HPTE call.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

 arch/powerpc/mm/pgtable_32.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2007-04-12 15:30:21 +10:00 committed by Paul Mackerras
parent a741e67969
commit 3be4e6990e
1 changed files with 6 additions and 3 deletions
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9
arch/powerpc/mm/pgtable_32.c
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@ -266,9 +266,12 @@ int map_page(unsigned long va, phys_addr_t pa, int flags)
pg = pte_alloc_kernel(pd, va);
if (pg != 0) {
err = 0;
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags)));
if (mem_init_done)
flush_HPTE(0, va, pmd_val(*pd));
/* The PTE should never be already set nor present in the
* hash table
*/
BUG_ON(pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE));
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
__pgprot(flags)));
}
return err;
}