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authorDavid S. Miller <davem@davemloft.net>2013-09-18 11:58:32 -0700
committerDavid S. Miller <davem@davemloft.net>2013-11-12 15:22:33 -0800
commitc920745e6964bd4b9315a17b018d83fad66010d3 (patch)
tree07a872bac01d893a5a494b12ece22404ba159dce /arch/sparc
parent10d0c9705e80bbd3d587c5fad24599aabaca6688 (diff)
downloadlinux-c920745e6964bd4b9315a17b018d83fad66010d3.tar.bz2
sparc64: Clean up 64-bit mmap exclusion defines.
Older UltraSPARC chips had an address space hole due to the MMU only supporting 44-bit virtual addresses. The top end of this hole also has the same value as the current definition of PAGE_OFFSET, so this can be confusing. Consolidate the defines for the userspace mmap exclusion range into page_64.h and use them in sys_sparc_64.c and hugetlbpage.c Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Bob Picco <bob.picco@oracle.com>
Diffstat (limited to 'arch/sparc')
-rw-r--r--arch/sparc/include/asm/page_64.h17
-rw-r--r--arch/sparc/kernel/sys_sparc_64.c3
-rw-r--r--arch/sparc/mm/hugetlbpage.c2
3 files changed, 15 insertions, 7 deletions
diff --git a/arch/sparc/include/asm/page_64.h b/arch/sparc/include/asm/page_64.h
index e15538899f3d..d95931247feb 100644
--- a/arch/sparc/include/asm/page_64.h
+++ b/arch/sparc/include/asm/page_64.h
@@ -93,9 +93,22 @@ typedef unsigned long pgprot_t;
typedef pte_t *pgtable_t;
+/* These two values define the virtual address space range in which we
+ * must forbid 64-bit user processes from making mappings. It
+ * represents the virtual address space hole present in most early
+ * sparc64 chips including UltraSPARC-I. The next two defines specify
+ * the actual exclusion region we enforce, wherein we use a 4GB red
+ * zone on each side of the VA hole.
+ */
+#define SPARC64_VA_HOLE_TOP _AC(0xfffff80000000000,UL)
+#define SPARC64_VA_HOLE_BOTTOM _AC(0x0000080000000000,UL)
+
+#define VA_EXCLUDE_START (SPARC64_VA_HOLE_BOTTOM - (1UL << 32UL))
+#define VA_EXCLUDE_END (SPARC64_VA_HOLE_TOP + (1UL << 32UL))
+
#define TASK_UNMAPPED_BASE (test_thread_flag(TIF_32BIT) ? \
- (_AC(0x0000000070000000,UL)) : \
- (_AC(0xfffff80000000000,UL) + (1UL << 32UL)))
+ _AC(0x0000000070000000,UL) : \
+ VA_EXCLUDE_END)
#include <asm-generic/memory_model.h>
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index 51561b8b15ba..d05eb9c1d846 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -39,9 +39,6 @@ asmlinkage unsigned long sys_getpagesize(void)
return PAGE_SIZE;
}
-#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
-#define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL))
-
/* Does addr --> addr+len fall within 4GB of the VA-space hole or
* overflow past the end of the 64-bit address space?
*/
diff --git a/arch/sparc/mm/hugetlbpage.c b/arch/sparc/mm/hugetlbpage.c
index 96399646570a..30963178d7e9 100644
--- a/arch/sparc/mm/hugetlbpage.c
+++ b/arch/sparc/mm/hugetlbpage.c
@@ -21,8 +21,6 @@
/* Slightly simplified from the non-hugepage variant because by
* definition we don't have to worry about any page coloring stuff
*/
-#define VA_EXCLUDE_START (0x0000080000000000UL - (1UL << 32UL))
-#define VA_EXCLUDE_END (0xfffff80000000000UL + (1UL << 32UL))
static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
unsigned long addr,