[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>

1 files changed, 7 insertions, 0 deletions

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)