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authorAndy Lutomirski <luto@kernel.org>2016-09-14 00:29:24 +0300
committerIngo Molnar <mingo@kernel.org>2016-09-15 09:25:13 +0300
commitc65eacbe290b8141554c71b2c94489e73ade8c8d (patch)
tree001c2aa33a3dded758550c659ced4b70e341e03e /include/linux/thread_info.h
parentd896fa20a70c9e596438728561e058a74ed3196b (diff)
downloadlinux-c65eacbe290b8141554c71b2c94489e73ade8c8d.tar.xz
sched/core: Allow putting thread_info into task_struct
If an arch opts in by setting CONFIG_THREAD_INFO_IN_TASK_STRUCT, then thread_info is defined as a single 'u32 flags' and is the first entry of task_struct. thread_info::task is removed (it serves no purpose if thread_info is embedded in task_struct), and thread_info::cpu gets its own slot in task_struct. This is heavily based on a patch written by Linus. Originally-from: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jann Horn <jann@thejh.net> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/a0898196f0476195ca02713691a5037a14f2aac5.1473801993.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/thread_info.h')
-rw-r--r--include/linux/thread_info.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index 2b5b10eed74f..e2d0fd81b1ba 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -13,6 +13,21 @@
struct timespec;
struct compat_timespec;
+#ifdef CONFIG_THREAD_INFO_IN_TASK
+struct thread_info {
+ u32 flags; /* low level flags */
+};
+
+#define INIT_THREAD_INFO(tsk) \
+{ \
+ .flags = 0, \
+}
+#endif
+
+#ifdef CONFIG_THREAD_INFO_IN_TASK
+#define current_thread_info() ((struct thread_info *)current)
+#endif
+
/*
* System call restart block.
*/