[SPARC64]: Move syscall success and newchild state out of thread flags.

These two bits were accesses non-atomically from assembler
code.  So, in order to eliminate any potential races resulting
from that, move these pieces of state into two bytes elsewhere
in struct thread_info.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 5 deletions

diff --git a/include/asm-sparc64/thread_info.h b/include/asm-sparc64/thread_info.h
index a1d25c06f92a..352d9943661a 100644
--- a/include/asm-sparc64/thread_info.h
+++ b/include/asm-sparc64/thread_info.h
@@ -47,7 +47,9 @@ struct thread_info {
         struct pt_regs          *kregs;
         struct exec_domain      *exec_domain;
         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
-        int                     __pad;
+        __u8                    new_child;
+        __u8                    syscall_noerror;
+        __u16                   __pad;
 
         unsigned long           *utraps;
 
@@ -87,6 +89,8 @@ struct thread_info {
 #define TI_KREGS        0x00000028
 #define TI_EXEC_DOMAIN  0x00000030
 #define TI_PRE_COUNT    0x00000038
+#define TI_NEW_CHILD    0x0000003c
+#define TI_SYS_NOERROR  0x0000003d
 #define TI_UTRAPS       0x00000040
 #define TI_REG_WINDOW   0x00000048
 #define TI_RWIN_SPTRS   0x000003c8      
@@ -219,10 +223,10 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define TIF_UNALIGNED           5       /* allowed to do unaligned accesses */
 #define TIF_NEWSIGNALS          6       /* wants new-style signals */
 #define TIF_32BIT               7       /* 32-bit binary */
-#define TIF_NEWCHILD            8       /* just-spawned child process */
+/* flag bit 8 is available */
 #define TIF_SECCOMP             9       /* secure computing */
 #define TIF_SYSCALL_AUDIT       10      /* syscall auditing active */
-#define TIF_SYSCALL_SUCCESS     11
+/* flag bit 11 is available */
 /* NOTE: Thread flags >= 12 should be ones we have no interest
  *       in using in assembly, else we can't use the mask as
  *       an immediate value in instructions such as andcc.
@@ -239,10 +243,8 @@ register struct thread_info *current_thread_info_reg asm("g6");
 #define _TIF_UNALIGNED          (1<<TIF_UNALIGNED)
 #define _TIF_NEWSIGNALS         (1<<TIF_NEWSIGNALS)
 #define _TIF_32BIT              (1<<TIF_32BIT)
-#define _TIF_NEWCHILD           (1<<TIF_NEWCHILD)
 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
-#define _TIF_SYSCALL_SUCCESS    (1<<TIF_SYSCALL_SUCCESS)
 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)