[11/12] ARM: 8108/1: mm: Introduce {pte,pmd}_isset and {pte,pmd}_isclear

Message ID 1415705499-197612-12-git-send-email-houpengyang@huawei.com
State New
Headers show

Commit Message

Hou Pengyang Nov. 11, 2014, 11:31 a.m.
From: Steven Capper <steve.capper@linaro.org>

commit f2950706871c4b6e8c0f0d7c3f62d35930b8de63 upstream.

Long descriptors on ARM are 64 bits, and some pte functions such as
pte_dirty return a bitwise-and of a flag with the pte value. If the
flag to be tested resides in the upper 32 bits of the pte, then we run
into the danger of the result being dropped if downcast.

For example:
	gather_stats(page, md, pte_dirty(*pte), 1);
where pte_dirty(*pte) is downcast to an int.

This patch introduces a new macro pte_isset which performs the bitwise
and, then performs a double logical invert (where needed) to ensure
predictable downcasting. The logical inverse pte_isclear is also

Equivalent pmd functions for Transparent HugePages have also been

Signed-off-by: Steve Capper <steve.capper@linaro.org>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
[hpy: Backported to 3.10:
 - adjust the context
 - ignore change to pmd, because 3.10 does not support HugePage.]
Signed-off-by: Hou Pengyang <houpengyang@huawei.com>

 arch/arm/include/asm/pgtable.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)


diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index 5aac06f..4043d7f 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -211,12 +211,16 @@  static inline pte_t *pmd_page_vaddr(pmd_t pmd)
 #define pte_clear(mm,addr,ptep)	set_pte_ext(ptep, __pte(0), 0)
+#define pte_isset(pte, val)	((u32)(val) == (val) ? pte_val(pte) & (val) \
+						: !!(pte_val(pte) & (val)))
+#define pte_isclear(pte, val)	(!(pte_val(pte) & (val)))
 #define pte_none(pte)		(!pte_val(pte))
-#define pte_present(pte)	(pte_val(pte) & L_PTE_PRESENT)
-#define pte_write(pte)		(!(pte_val(pte) & L_PTE_RDONLY))
-#define pte_dirty(pte)		(pte_val(pte) & L_PTE_DIRTY)
-#define pte_young(pte)		(pte_val(pte) & L_PTE_YOUNG)
-#define pte_exec(pte)		(!(pte_val(pte) & L_PTE_XN))
+#define pte_present(pte)	(pte_isset((pte), L_PTE_PRESENT))
+#define pte_write(pte)		(pte_isclear((pte), L_PTE_RDONLY))
+#define pte_dirty(pte)		(pte_isset((pte), L_PTE_DIRTY))
+#define pte_young(pte)		(pte_isset((pte), L_PTE_YOUNG))
+#define pte_exec(pte)		(pte_isclear((pte), L_PTE_XN))
 #define pte_special(pte)	(0)
 #define pte_present_user(pte)  (pte_present(pte) && (pte_val(pte) & L_PTE_USER))