xtensa: fix initialization of pt_regs::syscall in start_thread

New pt_regs should indicate that there's no syscall, not that there's
syscall #0. While at it wrap macro body in do/while and parenthesize
macro arguments.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/include/asm/processor.h b/arch/xtensa/include/asm/processor.h
index f7dd895b2353e0510a7199896030c8527695c130..0c14018d1c2601a63a92b2f29be1270d9919220c 100644 (file)
--- a/arch/xtensa/include/asm/processor.h
+++ b/arch/xtensa/include/asm/processor.h
@@ -187,15 +187,18 @@ struct thread_struct {
 
 /* Clearing a0 terminates the backtrace. */
 #define start_thread(regs, new_pc, new_sp) \
-       memset(regs, 0, sizeof(*regs)); \
-       regs->pc = new_pc; \
-       regs->ps = USER_PS_VALUE; \
-       regs->areg[1] = new_sp; \
-       regs->areg[0] = 0; \
-       regs->wmask = 1; \
-       regs->depc = 0; \
-       regs->windowbase = 0; \
-       regs->windowstart = 1;
+       do { \
+               memset((regs), 0, sizeof(*(regs))); \
+               (regs)->pc = (new_pc); \
+               (regs)->ps = USER_PS_VALUE; \
+               (regs)->areg[1] = (new_sp); \
+               (regs)->areg[0] = 0; \
+               (regs)->wmask = 1; \
+               (regs)->depc = 0; \
+               (regs)->windowbase = 0; \
+               (regs)->windowstart = 1; \
+               (regs)->syscall = NO_SYSCALL; \
+       } while (0)
 
 /* Forward declaration */
 struct task_struct;