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authorHugh Dickins <hugh@veritas.com>2005-04-19 13:29:22 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org.(none)>2005-04-19 13:29:22 -0700
commitcdfb82fff33cf3b1a367a427e5d89a012dc568b1 (patch)
treee06fe6c70972feac1c0ba1f6451c9b3d825c84c9
parent6119be0bba10e7e7b1e5650a87812fa2fd8d3a60 (diff)
downloadlinux-2.6.38-lt-ux500-cdfb82fff33cf3b1a367a427e5d89a012dc568b1.tar.gz
[PATCH] freepgt: arm26 FIRST_USER_ADDRESS PAGE_SIZE
ARM26 define FIRST_USER_ADDRESS as PAGE_SIZE (beyond the machine vectors when they are mapped low), and use that definition in place of locally defined MIN_MAP_ADDR. Previously, ARM26 permitted user mappings at 0 if the machine vectors were mapped high; but that's inconsistent with ARM, and FIRST_USER_ADDRESS would then have to be determined at runtime. Let's fix it at PAGE_SIZE throughout the architecture. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--arch/arm26/kernel/sys_arm.c9
-rw-r--r--include/asm-arm26/pgtable.h7
2 files changed, 11 insertions, 5 deletions
diff --git a/arch/arm26/kernel/sys_arm.c b/arch/arm26/kernel/sys_arm.c
index e7edd201579..85457897b8a 100644
--- a/arch/arm26/kernel/sys_arm.c
+++ b/arch/arm26/kernel/sys_arm.c
@@ -64,10 +64,10 @@ inline long do_mmap2(
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
/*
- * If we are doing a fixed mapping, and address < PAGE_SIZE,
+ * If we are doing a fixed mapping, and address < FIRST_USER_ADDRESS,
* then deny it.
*/
- if (flags & MAP_FIXED && addr < PAGE_SIZE && vectors_base() == 0)
+ if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
goto out;
error = -EBADF;
@@ -121,11 +121,10 @@ sys_arm_mremap(unsigned long addr, unsigned long old_len,
unsigned long ret = -EINVAL;
/*
- * If we are doing a fixed mapping, and address < PAGE_SIZE,
+ * If we are doing a fixed mapping, and address < FIRST_USER_ADDRESS,
* then deny it.
*/
- if (flags & MREMAP_FIXED && new_addr < PAGE_SIZE &&
- vectors_base() == 0)
+ if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
goto out;
down_write(&current->mm->mmap_sem);
diff --git a/include/asm-arm26/pgtable.h b/include/asm-arm26/pgtable.h
index af0b8907dc1..4a0a00da425 100644
--- a/include/asm-arm26/pgtable.h
+++ b/include/asm-arm26/pgtable.h
@@ -62,6 +62,13 @@
#define PTRS_PER_PMD 1
#define PTRS_PER_PTE 32
+/*
+ * This is the lowest virtual address we can permit any user space
+ * mapping to be mapped at. This is particularly important for
+ * non-high vector CPUs.
+ */
+#define FIRST_USER_ADDRESS PAGE_SIZE
+
#define FIRST_USER_PGD_NR 1
#define USER_PTRS_PER_PGD ((TASK_SIZE/PGD_SIZE) - FIRST_USER_PGD_NR)