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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-04-12 09:30:21 +0400
committerPaul Mackerras <paulus@samba.org>2007-04-12 22:09:39 +0400
commit3be4e6990edf65624cfcbf8f7e33810626b2eefa (patch)
treee0da9d35af9cd7779ec1c437ebd661892d586689 /arch/powerpc/mm/pgtable_32.c
parenta741e67969577163a4cfc78d7fd2753219087ef1 (diff)
downloadlinux-3be4e6990edf65624cfcbf8f7e33810626b2eefa.tar.xz
[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>
Diffstat (limited to 'arch/powerpc/mm/pgtable_32.c')
-rw-r--r--arch/powerpc/mm/pgtable_32.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index c284bdac9947..95d3afe36b51 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -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;
}