Re: [PATCH v6 1/9] kernel: Support TIF_SYSCALL_INTERCEPT flag

On Fri, Sep 04, 2020 at 04:31:39PM -0400, Gabriel Krisman Bertazi wrote:

+static inline void __set_tsk_syscall_intercept(struct task_struct *tsk,

• 			   unsigned int type)
  

+{

• tsk->syscall_intercept |= type;
• if (tsk->syscall_intercept)

• set_tsk_thread_flag(tsk, TIF_SYSCALL_INTERCEPT);
  

+}

Did the above want to be:

unsigned int old = tsk->syscall_intercept; tsk->syscall_intercept |= type; if (!old) set_tsk_thread_flag(tsk, TIF_SYSCALL_INTERCEPT)

?

+static inline void __clear_tsk_syscall_intercept(struct task_struct *tsk,

• 			     unsigned int type)
  

+{

• tsk->syscall_intercept &= ~type;
• if (tsk->syscall_intercept == 0)

• clear_tsk_thread_flag(tsk, TIF_SYSCALL_INTERCEPT);
  

+}