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[PATCH] freepgt: arm FIRST_USER_ADDRESS PAGE_SIZE

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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>
This commit is contained in:
Hugh Dickins 2005-04-19 13:29:21 -07:00 committed by Linus Torvalds
parent 8462e20175
commit 6119be0bba
2 changed files with 9 additions and 9 deletions
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11
arch/arm/kernel/sys_arm.c
View File

@ -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);

7
include/asm-arm/pgtable.h
View File

@ -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)