From: Xiangyou Xie <xiexiangyou@huawei.com> hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I912VN CVE: NA ------------------------------ When it is to wake up a task in a remote cpu shared LLC , we can simply set need_resched flag, waking up a cpu that is in polling idle. This wakeup action does not require an IPI. But the premise is that it need to support _TIF_POLLING_NRFLAG Signed-off-by: Xiangyou Xie <xiexiangyou@huawei.com> Signed-off-by: Peng Liang <liangpeng10@huawei.com> Signed-off-by: liangtian <liangtian13@huawei.com> --- arch/arm64/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h index 2dd890c8e4f8..f09616159a44 100644 --- a/arch/arm64/include/asm/thread_info.h +++ b/arch/arm64/include/asm/thread_info.h @@ -76,6 +76,7 @@ void arch_setup_new_exec(void); #define TIF_SYSCALL_TRACEPOINT 10 /* syscall tracepoint for ftrace */ #define TIF_SECCOMP 11 /* syscall secure computing */ #define TIF_SYSCALL_EMU 12 /* syscall emulation active */ +#define TIF_POLLING_NRFLAG 16 /* idle is polling for TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ #define TIF_FREEZE 19 #define TIF_RESTORE_SIGMASK 20 @@ -105,6 +106,7 @@ void arch_setup_new_exec(void); #define _TIF_MTE_ASYNC_FAULT (1 << TIF_MTE_ASYNC_FAULT) #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) #define _TIF_32BIT_AARCH64 (1 << TIF_32BIT_AARCH64) +#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) #define _TIF_WORK_MASK (_TIF_NEED_RESCHED | _TIF_SIGPENDING | \ _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \ -- 2.33.0