Commit affa219b authored Dec 03, 2008 by Joe Korty Committed by Ingo Molnar Dec 04, 2008

x86: change thread_info's flag field back to 32 bits



Impact: pack struct thread_info more tightly

Change x86_64's thread_info 'flags' field back to __u32.

This was changed to 'unsigned long' when the thread_info*.h
for i386 and x86_64 were merged.  Change it back.  We can
do this as only 27 bits of 'flags' are actually used.

This change actually packs down thread_info by 64 bits:
32 bits are saved by the smaller flags, and 32 bits are
saved by the following 'mm_segment_t field' becoming
naturally 64-bit aligned.

Signed-off-by: Joe Korty <joe.korty@ccur.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent c0515566

arch/x86/include/asm/thread_info.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -24,7 +24,7 @@ struct exec_domain;
		struct thread_info {
		struct task_struct task; / main task structure */
		struct exec_domain exec_domain; / execution domain */
		unsigned long flags; /* low level flags */
		__u32 flags; /* low level flags */
		__u32 status; /* thread synchronous flags */
		__u32 cpu; /* current CPU */
		int preempt_count; /* 0 => preemptable,