[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>

1 files changed, 4 insertions, 5 deletions

diff --git a/arch/arm26/kernel/sys_arm.c b/arch/arm26/kernel/sys_arm.c
index e7edd201579a..85457897b8a9 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);