[PATCH 12/23] thread: move thread bits accessors to separated file

From: Yury Norov <ynorov@caviumnetworks.com>
To: <arnd@arndb.de>, <catalin.marinas@arm.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <linux-doc@vger.kernel.org>,
	<linux-arch@vger.kernel.org>, <linux-s390@vger.kernel.org>,
	<libc-alpha@sourceware.org>
Cc: <schwidefsky@de.ibm.com>, <heiko.carstens@de.ibm.com>,
	<ynorov@caviumnetworks.com>, <pinskia@gmail.com>,
	<broonie@kernel.org>, <joseph@codesourcery.com>,
	<christoph.muellner@theobroma-systems.com>,
	<bamvor.zhangjian@huawei.com>, <szabolcs.nagy@arm.com>,
	<klimov.linux@gmail.com>, <Nathan_Lynch@mentor.com>,
	<agraf@suse.de>, <Prasun.Kapoor@caviumnetworks.com>,
	<kilobyte@angband.pl>, <geert@linux-m68k.org>,
	<philipp.tomsich@theobroma-systems.com>
Subject: [PATCH 12/23] thread: move thread bits accessors to separated file
Date: Tue, 24 May 2016 03:04:41 +0300	[thread overview]
Message-ID: <1464048292-30136-13-git-send-email-ynorov@caviumnetworks.com> (raw)
In-Reply-To: <1464048292-30136-1-git-send-email-ynorov@caviumnetworks.com>

They may be accessed from low-level code, so isolating is a measure to
avoid circular dependencies in header files.

The exact reason for circular dependency is WARN_ON() macro added by Al
Viro in patch [edd63a27] "set_restore_sigmask() is never called without
SIGPENDING (and never should be)"

Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
---
 include/linux/thread_bits.h | 55 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/thread_info.h | 44 +-----------------------------------
 2 files changed, 56 insertions(+), 43 deletions(-)
 create mode 100644 include/linux/thread_bits.h

diff --git a/include/linux/thread_bits.h b/include/linux/thread_bits.h
new file mode 100644
index 0000000..0d05d16
--- /dev/null
+++ b/include/linux/thread_bits.h
@@ -0,0 +1,55 @@
+
+/* thread_bits.h: common low-level thread bits accessors */
+
+#ifndef _LINUX_THREAD_BITS_H
+#define _LINUX_THREAD_BITS_H
+
+#ifndef __ASSEMBLY__
+
+#include <linux/bitops.h>
+#include <asm/thread_info.h>
+
+/*
+ * flag set/clear/test wrappers
+ * - pass TIF_xxxx constants to these functions
+ */
+
+static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
+{
+	set_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
+{
+	clear_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
+{
+	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
+{
+	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
+}
+
+static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
+{
+	return test_bit(flag, (unsigned long *)&ti->flags);
+}
+
+#define set_thread_flag(flag) \
+	set_ti_thread_flag(current_thread_info(), flag)
+#define clear_thread_flag(flag) \
+	clear_ti_thread_flag(current_thread_info(), flag)
+#define test_and_set_thread_flag(flag) \
+	test_and_set_ti_thread_flag(current_thread_info(), flag)
+#define test_and_clear_thread_flag(flag) \
+	test_and_clear_ti_thread_flag(current_thread_info(), flag)
+#define test_thread_flag(flag) \
+	test_ti_thread_flag(current_thread_info(), flag)
+
+#endif /* !__ASSEMBLY__ */
+#endif /* _LINUX_THREAD_BITS_H */
+
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index b4c2a48..b094aed 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -50,8 +50,7 @@ struct restart_block {
 
 extern long do_no_restart_syscall(struct restart_block *parm);
 
-#include <linux/bitops.h>
-#include <asm/thread_info.h>
+#include <linux/thread_bits.h>
 
 #ifdef __KERNEL__
 
@@ -62,47 +61,6 @@ extern long do_no_restart_syscall(struct restart_block *parm);
 # define THREADINFO_GFP		(GFP_KERNEL_ACCOUNT | __GFP_NOTRACK)
 #endif
 
-/*
- * flag set/clear/test wrappers
- * - pass TIF_xxxx constants to these functions
- */
-
-static inline void set_ti_thread_flag(struct thread_info *ti, int flag)
-{
-	set_bit(flag, (unsigned long *)&ti->flags);
-}
-
-static inline void clear_ti_thread_flag(struct thread_info *ti, int flag)
-{
-	clear_bit(flag, (unsigned long *)&ti->flags);
-}
-
-static inline int test_and_set_ti_thread_flag(struct thread_info *ti, int flag)
-{
-	return test_and_set_bit(flag, (unsigned long *)&ti->flags);
-}
-
-static inline int test_and_clear_ti_thread_flag(struct thread_info *ti, int flag)
-{
-	return test_and_clear_bit(flag, (unsigned long *)&ti->flags);
-}
-
-static inline int test_ti_thread_flag(struct thread_info *ti, int flag)
-{
-	return test_bit(flag, (unsigned long *)&ti->flags);
-}
-
-#define set_thread_flag(flag) \
-	set_ti_thread_flag(current_thread_info(), flag)
-#define clear_thread_flag(flag) \
-	clear_ti_thread_flag(current_thread_info(), flag)
-#define test_and_set_thread_flag(flag) \
-	test_and_set_ti_thread_flag(current_thread_info(), flag)
-#define test_and_clear_thread_flag(flag) \
-	test_and_clear_ti_thread_flag(current_thread_info(), flag)
-#define test_thread_flag(flag) \
-	test_ti_thread_flag(current_thread_info(), flag)
-
 #define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
 
 #if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
-- 
2.5.0
