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xtensa: fix initialization of pt_regs::syscall in start_thread

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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>
This commit is contained in:
Max Filippov 2019-04-03 20:22:42 -07:00
parent 2201f31f2c
commit 2663147dc7
1 changed files with 12 additions and 9 deletions
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21
arch/xtensa/include/asm/processor.h
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@ -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;