diff options
| author | Christophe Leroy <christophe.leroy@c-s.fr> | 2016-09-19 12:58:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-10-31 05:02:14 -0600 |
| commit | 56b47c0b7968f71ad971fc3f600bc5f1dc8d8ee8 (patch) | |
| tree | 29743d937cd27c3edfd46b4827226a2474a5f7e5 /arch | |
| parent | c80b599ab5d40c6aea170fd670b4802758623e54 (diff) | |
powerpc: Fix usage of _PAGE_RO in hugepage
commit 6b8cb66a6a7cc182b47da6a0a1d4e5da324c0695 upstream.
On some CPUs like the 8xx, _PAGE_RW hence _PAGE_WRITE is defined
as 0 and _PAGE_RO has to be set when a page is not writable
_PAGE_RO is defined by default in pte-common.h, however BOOK3S/64
doesn't include that file so _PAGE_RO has to be defined explicitly
in book3s/64/pgtable.h
Fixes: a7b9f671f2d14 ("powerpc32: adds handling of _PAGE_RO")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/pgtable.h | 2 | ||||
| -rw-r--r-- | arch/powerpc/mm/hugetlbpage.c | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 263bf39ced40..9bd84ba06ec4 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -6,6 +6,8 @@ */ #define _PAGE_BIT_SWAP_TYPE 0 +#define _PAGE_RO 0 + #define _PAGE_EXEC 0x00001 /* execute permission */ #define _PAGE_WRITE 0x00002 /* write access allowed */ #define _PAGE_READ 0x00004 /* read access allowed */ diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 7372ee13eb1e..a5d3ecdabc44 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -1019,8 +1019,15 @@ int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, pte = READ_ONCE(*ptep); mask = _PAGE_PRESENT | _PAGE_READ; + + /* + * On some CPUs like the 8xx, _PAGE_RW hence _PAGE_WRITE is defined + * as 0 and _PAGE_RO has to be set when a page is not writable + */ if (write) mask |= _PAGE_WRITE; + else + mask |= _PAGE_RO; if ((pte_val(pte) & mask) != mask) return 0; |