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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-04-07 06:39:36 +0200 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-04-07 06:39:47 +0200 |
| commit | 55052eeca6d71d76f7c3f156c0501814d8e5e6d3 (patch) | |
| tree | 7a13664cc8c99ffbad425dbc0eefd4ccceb70b8a /arch/powerpc/mm/pgtable_32.c | |
| parent | powerpc/mpsc: Set the port device in the mpsc serial driver (diff) | |
| download | linux-55052eeca6d71d76f7c3f156c0501814d8e5e6d3.tar.xz linux-55052eeca6d71d76f7c3f156c0501814d8e5e6d3.zip | |
powerpc: Fix ioremap_flags() with book3e pte definition
We can't just clear the user read permission in book3e pte, because
that will also clear supervisor read permission. This surely isn't
desired. Fix the problem by adding the supervisor read back.
BenH: Slightly simplified the ifdef and applied to ppc64 too
Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/pgtable_32.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index b9243e7557ae..767b0cf17d33 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -146,6 +146,14 @@ ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags) /* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */ flags &= ~(_PAGE_USER | _PAGE_EXEC); +#ifdef _PAGE_BAP_SR + /* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format + * which means that we just cleared supervisor access... oops ;-) This + * restores it + */ + flags |= _PAGE_BAP_SR; +#endif + return __ioremap_caller(addr, size, flags, __builtin_return_address(0)); } EXPORT_SYMBOL(ioremap_flags); |