From 3185bd26188223195dc2e659a3d00219cad71a0f Mon Sep 17 00:00:00 2001
From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Sat, 20 Oct 2012 15:52:23 +0100
Subject: alpha: separate thread-synchronous flags

... and fix the race in updating unaligned control ones

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 arch/alpha/include/asm/thread_info.h | 80 ++++++++++++++++++++++++------------
 1 file changed, 54 insertions(+), 26 deletions(-)

(limited to 'arch/alpha/include')

diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
index 4554ecbff7c..1f8c72959fb 100644
--- a/arch/alpha/include/asm/thread_info.h
+++ b/arch/alpha/include/asm/thread_info.h
@@ -7,6 +7,7 @@
 #include <asm/processor.h>
 #include <asm/types.h>
 #include <asm/hwrpb.h>
+#include <asm/sysinfo.h>
 #endif
 
 #ifndef __ASSEMBLY__
@@ -21,6 +22,7 @@ struct thread_info {
 	mm_segment_t		addr_limit;	/* thread address space */
 	unsigned		cpu;		/* current CPU */
 	int			preempt_count; /* 0 => preemptable, <0 => BUG */
+	unsigned int		status;		/* thread-synchronous flags */
 
 	int bpt_nsaved;
 	unsigned long bpt_addr[2];		/* breakpoint handling  */
@@ -63,8 +65,6 @@ register struct thread_info *__current_thread_info __asm__("$8");
  * - these are process state flags and used from assembly
  * - 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.
  */
@@ -72,18 +72,12 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #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	/* ! Preserve sequence of following */
-#define TIF_UAC_NOFIX		11	/* ! flags as they match            */
-#define TIF_UAC_SIGBUS		12	/* ! userspace part of 'osf_sysinfo' */
 #define TIF_MEMDIE		13	/* is terminating due to OOM killer */
-#define TIF_RESTORE_SIGMASK	14	/* restore signal mask in do_signal */
 
 #define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
 #define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
 #define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
-#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
 #define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
 
 /* Work to do on interrupt/exception return.  */
@@ -94,29 +88,63 @@ register struct thread_info *__current_thread_info __asm__("$8");
 #define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
 				 | _TIF_SYSCALL_TRACE)
 
-#define ALPHA_UAC_SHIFT		TIF_UAC_NOPRINT
-#define ALPHA_UAC_MASK		(1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
-				 1 << TIF_UAC_SIGBUS)
+#define TS_UAC_NOPRINT		0x0001	/* ! Preserve the following three */
+#define TS_UAC_NOFIX		0x0002	/* ! flags as they match          */
+#define TS_UAC_SIGBUS		0x0004	/* ! userspace part of 'osf_sysinfo' */
+#define TS_RESTORE_SIGMASK	0x0008	/* restore signal mask in do_signal() */
+#define TS_POLLING		0x0010	/* idle task polling need_resched,
+					   skip sending interrupt */
 
-#define SET_UNALIGN_CTL(task,value)	({				     \
-	task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
-		~ALPHA_UAC_MASK)					     \
-		| (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
-		| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
-		| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
+#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
+
+#ifndef __ASSEMBLY__
+#define HAVE_SET_RESTORE_SIGMASK	1
+static inline void set_restore_sigmask(void)
+{
+	struct thread_info *ti = current_thread_info();
+	ti->status |= TS_RESTORE_SIGMASK;
+	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
+}
+static inline void clear_restore_sigmask(void)
+{
+	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
+}
+static inline bool test_restore_sigmask(void)
+{
+	return current_thread_info()->status & TS_RESTORE_SIGMASK;
+}
+static inline bool test_and_clear_restore_sigmask(void)
+{
+	struct thread_info *ti = current_thread_info();
+	if (!(ti->status & TS_RESTORE_SIGMASK))
+		return false;
+	ti->status &= ~TS_RESTORE_SIGMASK;
+	return true;
+}
+#endif
+
+#define SET_UNALIGN_CTL(task,value)	({				\
+	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
+	if (value & PR_UNALIGN_NOPRINT)					\
+		status |= TS_UAC_NOPRINT;				\
+	if (value & PR_UNALIGN_SIGBUS)					\
+		status |= TS_UAC_SIGBUS;				\
+	if (value & 4)	/* alpha-specific */				\
+		status |= TS_UAC_NOFIX;					\
+	task_thread_info(task)->status = status;			\
 	0; })
 
 #define GET_UNALIGN_CTL(task,value)	({				\
-	put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
-		  >> ALPHA_UAC_SHIFT					\
-		 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
-		 >> (ALPHA_UAC_SHIFT + 1)				\
-		 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
-		 >> (ALPHA_UAC_SHIFT - 1),				\
-		 (int __user *)(value));				\
+	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
+	__u32 res = 0;							\
+	if (status & TS_UAC_NOPRINT)					\
+		res |= PR_UNALIGN_NOPRINT;				\
+	if (status & TS_UAC_SIGBUS)					\
+		res |= PR_UNALIGN_SIGBUS;				\
+	if (status & TS_UAC_NOFIX)					\
+		res |= 4;						\
+	put_user(res, (int __user *)(value));				\
 	})
 
-#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
-
 #endif /* __KERNEL__ */
 #endif /* _ALPHA_THREAD_INFO_H */
-- 
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