In the generic entry code, the beginning of syscall_exit_to_user_mode_work() can be reused on arm64 so it makes sense to split it.
In preparation for moving arm64 over to the generic entry code, split out syscall_exit_to_user_mode_prepare() helper from syscall_exit_to_user_mode_work().
No functional changes.
Reviewed-by: Kevin Brodsky kevin.brodsky@arm.com Reviewed-by: Thomas Gleixner tglx@linutronix.de Signed-off-by: Jinjie Ruan ruanjinjie@huawei.com --- include/linux/entry-common.h | 35 ++++++++++++++++++++++------------- 1 file changed, 22 insertions(+), 13 deletions(-)
diff --git a/include/linux/entry-common.h b/include/linux/entry-common.h index 7177436f0f9e..cd6dacb2d8bf 100644 --- a/include/linux/entry-common.h +++ b/include/linux/entry-common.h @@ -137,20 +137,11 @@ static __always_inline long syscall_enter_from_user_mode(struct pt_regs *regs, l */ void syscall_exit_work(struct pt_regs *regs, unsigned long work);
-/** - * syscall_exit_to_user_mode_work - Handle work before returning to user mode - * @regs: Pointer to currents pt_regs - * - * Same as step 1 and 2 of syscall_exit_to_user_mode() but without calling - * exit_to_user_mode() to perform the final transition to user mode. - * - * Calling convention is the same as for syscall_exit_to_user_mode() and it - * returns with all work handled and interrupts disabled. The caller must - * invoke exit_to_user_mode() before actually switching to user mode to - * make the final state transitions. Interrupts must stay disabled between - * return from this function and the invocation of exit_to_user_mode(). +/* + * Syscall specific exit to user mode preparation. Runs with interrupts + * enabled. */ -static __always_inline void syscall_exit_to_user_mode_work(struct pt_regs *regs) +static __always_inline void syscall_exit_to_user_mode_prepare(struct pt_regs *regs) { unsigned long work = READ_ONCE(current_thread_info()->syscall_work); unsigned long nr = syscall_get_nr(current, regs); @@ -171,6 +162,24 @@ static __always_inline void syscall_exit_to_user_mode_work(struct pt_regs *regs) */ if (unlikely(work & SYSCALL_WORK_EXIT)) syscall_exit_work(regs, work); +} + +/** + * syscall_exit_to_user_mode_work - Handle work before returning to user mode + * @regs: Pointer to currents pt_regs + * + * Same as step 1 and 2 of syscall_exit_to_user_mode() but without calling + * exit_to_user_mode() to perform the final transition to user mode. + * + * Calling convention is the same as for syscall_exit_to_user_mode() and it + * returns with all work handled and interrupts disabled. The caller must + * invoke exit_to_user_mode() before actually switching to user mode to + * make the final state transitions. Interrupts must stay disabled between + * return from this function and the invocation of exit_to_user_mode(). + */ +static __always_inline void syscall_exit_to_user_mode_work(struct pt_regs *regs) +{ + syscall_exit_to_user_mode_prepare(regs); local_irq_disable_exit_to_user(); exit_to_user_mode_prepare(regs); }