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arc: add support for TIF_NOTIFY_SIGNAL

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Wire up TIF_NOTIFY_SIGNAL handling for arc.

Cc: linux-snps-arc@lists.infradead.org
Acked-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-10-12 07:15:37 -06:00
parent 88f93de1de
commit 53855e1258
3 changed files with 6 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

4
arch/arc/include/asm/thread_info.h
View file

@ -79,6 +79,7 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
#define TIF_SIGPENDING 2 /* signal pending */
#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
#define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
#define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */
#define TIF_SYSCALL_TRACE 15 /* syscall trace active */
/* true if poll_idle() is polling TIF_NEED_RESCHED */
@ -89,11 +90,12 @@ static inline __attribute_const__ struct thread_info *current_thread_info(void)
#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
#define _TIF_NOTIFY_SIGNAL (1<<TIF_NOTIFY_SIGNAL)
#define _TIF_MEMDIE (1<<TIF_MEMDIE)
/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
_TIF_NOTIFY_RESUME)
_TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
/*
* _TIF_ALLWORK_MASK includes SYSCALL_TRACE, but we don't need it.

3
arch/arc/kernel/entry.S
View file

@ -307,7 +307,8 @@ resume_user_mode_begin:
mov r0, sp ; pt_regs for arg to do_signal()/do_notify_resume()
GET_CURR_THR_INFO_FLAGS r9
bbit0 r9, TIF_SIGPENDING, .Lchk_notify_resume
and.f 0, r9, TIF_SIGPENDING|TIF_NOTIFY_SIGNAL
bz .Lchk_notify_resume
; Normal Trap/IRQ entry only saves Scratch (caller-saved) regs
; in pt_reg since the "C" ABI (kernel code) will automatically

2
arch/arc/kernel/signal.c
View file

@ -362,7 +362,7 @@ void do_signal(struct pt_regs *regs)
restart_scall = in_syscall(regs) && syscall_restartable(regs);
if (get_signal(&ksig)) {
if (test_thread_flag(TIF_SIGPENDING) && get_signal(&ksig)) {
if (restart_scall) {
arc_restart_syscall(&ksig.ka, regs);
syscall_wont_restart(regs); /* No more restarts */