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authorSumit Singh <sumsingh@nvidia.com>2014-03-12 14:44:44 +0530
committerRiham Haidar <rhaidar@nvidia.com>2014-06-13 11:54:21 -0700
commitddc6607ba07751e5a70bb08585d8e92494998783 (patch)
tree536f786757940057deb8a1c9d604d434dd46475c /include
parent3df9a622a5dde68235e7e0fc665f85e531781938 (diff)
thread_info: enhance power efficiency
Using cpu_relaxed_read_long and defining relaxed version of some macros, and functions so that it can be used to improve power efficiency. bug 1440421 Change-Id: If857ff7110cffadc6f13289a6395d253a8e3e232 Signed-off-by: Sumit Singh <sumsingh@nvidia.com> Reviewed-on: http://git-master/r/380859 (cherry picked from commit a66b23c6971403594cc6a82923c8df3b8472de90) Reviewed-on: http://git-master/r/422251 Reviewed-by: Automatic_Commit_Validation_User GVS: Gerrit_Virtual_Submit Reviewed-by: Bharat Nihalani <bnihalani@nvidia.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/thread_info.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 4ae6f32c8033..c7e3e8ff7f30 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -2,6 +2,8 @@
*
* Copyright (C) 2002 David Howells (dhowells@redhat.com)
* - Incorporating suggestions made by Linus Torvalds
+ *
+ * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*/
#ifndef _LINUX_THREAD_INFO_H
@@ -9,6 +11,7 @@
#include <linux/types.h>
#include <linux/bug.h>
+#include <asm/relaxed.h>
struct timespec;
struct compat_timespec;
@@ -88,6 +91,12 @@ 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_relaxed(struct thread_info *ti, int flag)
+{
+ ti->flags = cpu_relaxed_read_long(&ti->flags);
+ return test_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);
@@ -103,12 +112,16 @@ static inline int test_ti_thread_flag(struct thread_info *ti, int 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 test_thread_flag_relaxed(flag) \
+ test_ti_thread_flag_relaxed(current_thread_info(), flag)
#define set_need_resched() set_thread_flag(TIF_NEED_RESCHED)
#define clear_need_resched() clear_thread_flag(TIF_NEED_RESCHED)
#define tif_need_resched() test_thread_flag(TIF_NEED_RESCHED)
+#define tif_need_resched_relaxed() test_thread_flag_relaxed(TIF_NEED_RESCHED)
+
#if defined TIF_RESTORE_SIGMASK && !defined HAVE_SET_RESTORE_SIGMASK
/*
* An arch can define its own version of set_restore_sigmask() to get the