Merge branch 'set_fs-4' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic into asm-generic

Christoph Hellwig and a few others spent a huge effort on removing
set_fs() from most of the important architectures, but about half the
other architectures were never completed even though most of them don't
actually use set_fs() at all.

I did a patch for microblaze at some point, which turned out to be fairly
generic, and now ported it to most other architectures, using new generic
implementations of access_ok() and __{get,put}_kernel_nocheck().

Three architectures (sparc64, ia64, and sh) needed some extra work,
which I also completed.

* 'set_fs-4' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  uaccess: remove CONFIG_SET_FS
  ia64: remove CONFIG_SET_FS support
  sh: remove CONFIG_SET_FS support
  sparc64: remove CONFIG_SET_FS support
  lib/test_lockup: fix kernel pointer check for separate address spaces
  uaccess: generalize access_ok()
  uaccess: fix type mismatch warnings from access_ok()
  arm64: simplify access_ok()
  m68k: fix access_ok for coldfire
  MIPS: use simpler access_ok()
  MIPS: Handle address errors for accesses above CPU max virtual user address
  uaccess: add generic __{get,put}_kernel_nofault
  nios2: drop access_ok() check from __put_user()
  x86: use more conventional access_ok() definition
  x86: remove __range_not_ok()
  sparc64: add __{get,put}_kernel_nofault()
  nds32: fix access_ok() checks in get/put_user
  uaccess: fix nios2 and microblaze get_user_8()
  uaccess: fix integer overflow on access_ok()

1 files changed, 8 insertions, 18 deletions

diff --git a/arch/ia64/include/asm/uaccess.h b/arch/ia64/include/asm/uaccess.h
index e19d2dcc0ced..60adadeb3e9e 100644
--- a/arch/ia64/include/asm/uaccess.h
+++ b/arch/ia64/include/asm/uaccess.h
@@ -42,30 +42,20 @@
 #include <asm/extable.h>
 
 /*
- * For historical reasons, the following macros are grossly misnamed:
- */
-#define KERNEL_DS	((mm_segment_t) { ~0UL })		/* cf. access_ok() */
-#define USER_DS		((mm_segment_t) { TASK_SIZE-1 })	/* cf. access_ok() */
-
-#define get_fs()  (current_thread_info()->addr_limit)
-#define set_fs(x) (current_thread_info()->addr_limit = (x))
-
-#define uaccess_kernel()	(get_fs().seg == KERNEL_DS.seg)
-
-/*
- * When accessing user memory, we need to make sure the entire area really is in
- * user-level space.  In order to do this efficiently, we make sure that the page at
- * address TASK_SIZE is never valid.  We also need to make sure that the address doesn't
+ * When accessing user memory, we need to make sure the entire area really is
+ * in user-level space.  We also need to make sure that the address doesn't
  * point inside the virtually mapped linear page table.
  */
 static inline int __access_ok(const void __user *p, unsigned long size)
 {
+	unsigned long limit = TASK_SIZE;
 	unsigned long addr = (unsigned long)p;
-	unsigned long seg = get_fs().seg;
-	return likely(addr <= seg) &&
-	 (seg == KERNEL_DS.seg || likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT));
+
+	return likely((size <= limit) && (addr <= (limit - size)) &&
+		 likely(REGION_OFFSET(addr) < RGN_MAP_LIMIT));
 }
-#define access_ok(addr, size)	__access_ok((addr), (size))
+#define __access_ok __access_ok
+#include <asm-generic/access_ok.h>
 
 /*
  * These are the main single-value transfer routines.  They automatically