Alpha: Rearrange thread info flags fixing two regressions

The removal of the TIF_NOTIFY_RESUME flag, commit a583f1b54249b
"remove unused TIF_NOTIFY_RESUME flag," resulted in incorrect
setting of the unaligned access control flags by the prctl syscall.

The re-addition of the TIF_NOTIFY_RESUME flag, commit d0420c83f39f
"KEYS: Extend TIF_NOTIFY_RESUME to (almost) all architectures [try #6]"
further caused problems, namely incorrect operands to assembler code
as evidenced by:

AS      arch/alpha/kernel/entry.o
arch/alpha/kernel/entry.S: Assembler messages:
arch/alpha/kernel/entry.S:326: Warning: operand out of range
(0x0000000000000406 is not between 0x0000000000000000 and
0x00000000000000ff)

Both regressions fixed by (1) rearranging TIF_NOTIFY_RESUME flag to be
in lower 8 bits of the thread info flags, and (2) making sure that
ALPHA_UAC_SHIFT matches the rearrangement of the thread info flags.

Signed-off-by: Michael Cree <mcree@orcon.net.nz>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: David Howells <dhowells@redhat.com>,
Signed-off-by: Matt Turner <mattst88@gmail.com>

diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 815680b..b3e8886 100644 (file)
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -61,21 +61,24 @@ register struct thread_info *__current_thread_info __asm__("$8");
 /*
  * Thread information flags:
  * - these are process state flags and used from assembly
- * - pending work-to-be-done flags come first to fit in and immediate operand.
+ * - pending work-to-be-done flags come first and must be assigned to be
+ *   within bits 0 to 7 to fit in and immediate operand.
+ * - ALPHA_UAC_SHIFT below must be kept consistent with the unaligned
+ *   control flags.
  *
  * TIF_SYSCALL_TRACE is known to be 0 via blbs.
  */
 #define TIF_SYSCALL_TRACE      0       /* syscall trace active */
-#define TIF_SIGPENDING         1       /* signal pending */
-#define TIF_NEED_RESCHED       2       /* rescheduling necessary */
-#define TIF_POLLING_NRFLAG     3       /* poll_idle is polling NEED_RESCHED */
-#define TIF_DIE_IF_KERNEL      4       /* dik recursion lock */
-#define TIF_UAC_NOPRINT                5       /* see sysinfo.h */
-#define TIF_UAC_NOFIX          6
-#define TIF_UAC_SIGBUS         7
-#define TIF_MEMDIE             8
-#define TIF_RESTORE_SIGMASK    9       /* restore signal mask in do_signal */
-#define TIF_NOTIFY_RESUME      10      /* callback before returning to user */
+#define TIF_NOTIFY_RESUME      1       /* callback before returning to user */
+#define TIF_SIGPENDING         2       /* signal pending */
+#define TIF_NEED_RESCHED       3       /* rescheduling necessary */
+#define TIF_POLLING_NRFLAG     8       /* poll_idle is polling NEED_RESCHED */
+#define TIF_DIE_IF_KERNEL      9       /* dik recursion lock */
+#define TIF_UAC_NOPRINT                10      /* see sysinfo.h */
+#define TIF_UAC_NOFIX          11
+#define TIF_UAC_SIGBUS         12
+#define TIF_MEMDIE             13
+#define TIF_RESTORE_SIGMASK    14      /* restore signal mask in do_signal */
 #define TIF_FREEZE             16      /* is freezing for suspend */
 
 #define _TIF_SYSCALL_TRACE     (1<<TIF_SYSCALL_TRACE)
@@ -94,7 +97,7 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #define _TIF_ALLWORK_MASK      (_TIF_WORK_MASK         \
                                 | _TIF_SYSCALL_TRACE)
 
-#define ALPHA_UAC_SHIFT                6
+#define ALPHA_UAC_SHIFT                10
 #define ALPHA_UAC_MASK         (1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
                                 1 << TIF_UAC_SIGBUS)