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authorHugh Dickins <hugh@veritas.com>2005-04-20 00:29:21 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org.(none)>2005-04-20 00:29:21 +0400
commit6119be0bba10e7e7b1e5650a87812fa2fd8d3a60 (patch)
tree5acc21e0611f1caf7163c120ca4214b2ee452b0d
parent8462e201756dd3bbe7e542106fc6fd6fe059cee2 (diff)
downloadlinux-6119be0bba10e7e7b1e5650a87812fa2fd8d3a60.tar.xz
[PATCH] freepgt: arm FIRST_USER_ADDRESS PAGE_SIZE
ARM 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. 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/arm/kernel/sys_arm.c11
-rw-r--r--include/asm-arm/pgtable.h7
2 files changed, 9 insertions, 9 deletions
diff --git a/arch/arm/kernel/sys_arm.c b/arch/arm/kernel/sys_arm.c
index c41dc605f121..7ba6342cf93d 100644
--- a/arch/arm/kernel/sys_arm.c
+++ b/arch/arm/kernel/sys_arm.c
@@ -51,13 +51,6 @@ asmlinkage int sys_pipe(unsigned long __user *fildes)
return error;
}
-/*
- * 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 MIN_MAP_ADDR (PAGE_SIZE)
-
/* common code for old and new mmaps */
inline long do_mmap2(
unsigned long addr, unsigned long len,
@@ -69,7 +62,7 @@ inline long do_mmap2(
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
- if (flags & MAP_FIXED && addr < MIN_MAP_ADDR)
+ if (flags & MAP_FIXED && addr < FIRST_USER_ADDRESS)
goto out;
error = -EBADF;
@@ -122,7 +115,7 @@ sys_arm_mremap(unsigned long addr, unsigned long old_len,
{
unsigned long ret = -EINVAL;
- if (flags & MREMAP_FIXED && new_addr < MIN_MAP_ADDR)
+ if (flags & MREMAP_FIXED && new_addr < FIRST_USER_ADDRESS)
goto out;
down_write(&current->mm->mmap_sem);
diff --git a/include/asm-arm/pgtable.h b/include/asm-arm/pgtable.h
index 91ffb1f4cd10..2df4eacf4fa9 100644
--- a/include/asm-arm/pgtable.h
+++ b/include/asm-arm/pgtable.h
@@ -102,6 +102,13 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
+/*
+ * 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/PGDIR_SIZE) - FIRST_USER_PGD_NR)