[PATCH v2 02/10] entry: Expose helpers to migrate TIF to SYSCALL_WORK flags

Gabriel Krisman Bertazi
2020-11-16T17:42:55Z

With the goal to split the syscall work related flags into a separate
field that is architecture independent, expose transitional helpers that
resolve to either the TIF flags or to the corresponding SYSCALL_WORK
flags. This will allow architectures to migrate only when they port to
the generic syscall entry code.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>

---
Changes since v2:
- Drop bogus cast to ulong (hch)
- Fix subsystem prefix (tglx)
---
include/linux/thread_info.h | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)

diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index e93e249a4e9b..f2d78de55840 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -97,6 +97,36 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
#define test_thread_flag(flag) \
test_ti_thread_flag(current_thread_info(), flag)

+#ifdef CONFIG_GENERIC_ENTRY
+#define set_syscall_work(fl) \
+ set_bit(SYSCALL_WORK_BIT_##fl, &current_thread_info()->syscall_work)
+#define test_syscall_work(fl) \
+ test_bit(SYSCALL_WORK_BIT_##fl, &current_thread_info()->syscall_work)
+#define clear_syscall_work(fl) \
+ clear_bit(SYSCALL_WORK_BIT_##fl, &current_thread_info()->syscall_work)
+
+#define set_task_syscall_work(t, fl) \
+ set_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
+#define test_task_syscall_work(t, fl) \
+ test_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
+#define clear_task_syscall_work(t, fl) \
+ clear_bit(SYSCALL_WORK_BIT_##fl, &task_thread_info(t)->syscall_work)
+#else
+#define set_syscall_work(fl) \
+ set_ti_thread_flag(current_thread_info(), SYSCALL_WORK_##fl)
+#define test_syscall_work(fl) \
+ test_ti_thread_flag(current_thread_info(), SYSCALL_WORK_##fl)
+#define clear_syscall_work(fl) \
+ clear_ti_thread_flag(current_thread_info(), SYSCALL_WORK_##fl)
+
+#define set_task_syscall_work(t, fl) \
+ set_ti_thread_flag(task_thread_info(t), TIF_##fl)
+#define test_task_syscall_work(t, fl) \
+ test_ti_thread_flag(task_thread_info(t), TIF_##fl)
+#define clear_task_syscall_work(t, fl) \
+ clear_ti_thread_flag(task_thread_info(t), TIF_##fl)
+#endif /* CONFIG_GENERIC_ENTRY */
+
#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)

#ifndef CONFIG_HAVE_ARCH_WITHIN_STACK_FRAMES
--
2.29.2