[PATCH 3/6] freepgt2: 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 <[email protected]>
---

 arch/arm/kernel/sys_arm.c |   11 ++---------
 include/asm-arm/pgtable.h |    7 +++++++
 2 files changed, 9 insertions(+), 9 deletions(-)

--- 2.6.12-rc2-mm1/arch/arm/kernel/sys_arm.c	2005-04-05 15:20:23.000000000 +0100
+++ linux/arch/arm/kernel/sys_arm.c	2005-04-05 18:59:00.000000000 +0100
@@ -51,13 +51,6 @@ asmlinkage int sys_pipe(unsigned long __
 	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, unsig
 {
 	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);
--- 2.6.12-rc2-mm1/include/asm-arm/pgtable.h	2005-04-05 15:20:55.000000000 +0100
+++ linux/include/asm-arm/pgtable.h	2005-04-05 18:59:00.000000000 +0100
@@ -102,6 +102,13 @@ extern void __pgd_error(const char *file
 #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)
 
-
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---

• References:
  • [PATCH 1/6] freepgt2: free_pgtables from FIRST_USER_ADDRESS
    • From: Hugh Dickins <[email protected]>

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