We've had TASK_SIZE set to 1<<31 for 31bit tasks since May 2004.
Before that old32_mmap() had to deal with do_mmap_pgoff() giving
it an address out of range. It had tried to do that by checking
return value and doing do_munmap() (at wrong address, BTW).
IOW, that code had been dead for 5.5 years (and bogus - for 8).
Kill.
Signed-off-by: Al Viro <[email protected]>
---
arch/s390/kernel/compat_linux.c | 5 -----
1 files changed, 0 insertions(+), 5 deletions(-)
diff --git a/arch/s390/kernel/compat_linux.c b/arch/s390/kernel/compat_linux.c
index 0debcec..c5a9fba 100644
--- a/arch/s390/kernel/compat_linux.c
+++ b/arch/s390/kernel/compat_linux.c
@@ -701,11 +701,6 @@ static inline long do_mmap2(
down_write(¤t->mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
- if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
- /* Result is out of bounds. */
- do_munmap(current->mm, addr, len);
- error = -ENOMEM;
- }
up_write(¤t->mm->mmap_sem);
if (file)
--
1.5.6.5