diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/entry-common.h | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h index da60980a2e7b..e370be8121aa 100644 --- a/include/linux/entry-common.h +++ b/include/linux/entry-common.h @@ -301,6 +301,25 @@ static inline void arch_syscall_exit_tracehook(struct pt_regs *regs, bool step) #endif /** + * exit_to_user_mode - Fixup state when exiting to user mode + * + * Syscall/interrupt exit enables interrupts, but the kernel state is + * interrupts disabled when this is invoked. Also tell RCU about it. + * + * 1) Trace interrupts on state + * 2) Invoke context tracking if enabled to adjust RCU state + * 3) Invoke architecture specific last minute exit code, e.g. speculation + * mitigations, etc.: arch_exit_to_user_mode() + * 4) Tell lockdep that interrupts are enabled + * + * Invoked from architecture specific code when syscall_exit_to_user_mode() + * is not suitable as the last step before returning to userspace. Must be + * invoked with interrupts disabled and the caller must be + * non-instrumentable. + */ +void exit_to_user_mode(void); + +/** * syscall_exit_to_user_mode - Handle work before returning to user mode * @regs: Pointer to currents pt_regs * @@ -322,8 +341,8 @@ static inline void arch_syscall_exit_tracehook(struct pt_regs *regs, bool step) * - Architecture specific one time work arch_exit_to_user_mode_prepare() * - Address limit and lockdep checks * - * 3) Final transition (lockdep, tracing, context tracking, RCU). Invokes - * arch_exit_to_user_mode() to handle e.g. speculation mitigations + * 3) Final transition (lockdep, tracing, context tracking, RCU), i.e. the + * functionality in exit_to_user_mode(). */ void syscall_exit_to_user_mode(struct pt_regs *regs); |