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From:   Gabriel Krisman Bertazi <krisman@collabora.com>
To:     tglx@linutronix.de
Cc:     mingo@redhat.com, keescook@chromium.org, arnd@arndb.de,
        luto@amacapital.net, wad@chromium.org, rostedt@goodmis.org,
        paul@paul-moore.com, eparis@redhat.com, oleg@redhat.com,
        linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
        x86@kernel.org, Gabriel Krisman Bertazi <krisman@collabora.com>,
        kernel@collabora.com
Subject: [PATCH 02/10] kernel: entry: Expose helpers to migrate TIF to SYSCALL_WORK flags
Date:   Fri, 13 Nov 2020 22:29:09 -0500
Message-Id: <20201114032917.1205658-3-krisman@collabora.com>
In-Reply-To: <20201114032917.1205658-1-krisman@collabora.com>
References: <20201114032917.1205658-1-krisman@collabora.com>
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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>
---
 include/linux/thread_info.h | 42 +++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index e93e249a4e9b..18755373dc4d 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -97,6 +97,48 @@ 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
+static inline void __set_task_syscall_work(struct thread_info *ti, int flag)
+{
+	set_bit(flag, (unsigned long *)&ti->syscall_work);
+}
+static inline int __test_task_syscall_work(struct thread_info *ti, int flag)
+{
+	return test_bit(flag, (unsigned long *)&ti->syscall_work);
+}
+static inline void __clear_task_syscall_work(struct thread_info *ti, int flag)
+{
+	return clear_bit(flag, (unsigned long *)&ti->syscall_work);
+}
+#define set_syscall_work(fl) \
+	__set_task_syscall_work(current_thread_info(), SYSCALL_WORK_##fl)
+#define test_syscall_work(fl) \
+	__test_task_syscall_work(current_thread_info(), SYSCALL_WORK_##fl)
+#define clear_syscall_work(fl) \
+	__clear_task_syscall_work(current_thread_info(), SYSCALL_WORK_##fl)
+
+#define set_task_syscall_work(t, fl) \
+	__set_task_syscall_work(task_thread_info(t), SYSCALL_WORK_##fl)
+#define test_task_syscall_work(t, fl) \
+	__test_task_syscall_work(task_thread_info(t), SYSCALL_WORK_##fl)
+#define clear_task_syscall_work(t, fl) \
+	__clear_task_syscall_work(task_thread_info(t), SYSCALL_WORK_##fl)
+#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