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authorMark Rutland <mark.rutland@arm.com>2016-09-23 18:24:07 +0100
committerIngo Molnar <mingo@kernel.org>2016-09-24 09:35:06 +0200
commit907241dccb4ce5d9413cf3c030b32b0cfc184914 (patch)
treee02001fd1353f714853fe399d8bab1a7f010e04e /include/linux/thread_info.h
parent317c2ce77d8ab73c24f4fb9c75e5bb441fbe3e30 (diff)
thread_info: Use unsigned long for flags
The generic THREAD_INFO_IN_TASK definition of thread_info::flags is a u32, matching x86 prior to the introduction of THREAD_INFO_IN_TASK. However, common helpers like test_ti_thread_flag() implicitly assume that thread_info::flags has at least the size and alignment of unsigned long, and relying on padding and alignment provided by other elements of task_struct is somewhat fragile. Additionally, some architectures use more that 32 bits for thread_info::flags, and others may need to in future. With THREAD_INFO_IN_TASK, task struct follows thread_info with a long field, and thus we no longer save any space as we did back in commit: affa219b60a11b32 ("x86: change thread_info's flag field back to 32 bits") Given all this, it makes more sense for the generic thread_info::flags to be an unsigned long. In fact given <linux/thread_info.h> contains/uses the helpers mentioned above, BE arches *must* use unsigned long (or something of the same size) today, or they wouldn't work. Make it so. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: 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: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Kees Cook <keescook@chromium.org> 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/1474651447-30447-1-git-send-email-mark.rutland@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/thread_info.h')
-rw-r--r--include/linux/thread_info.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index e2d0fd81b1ba..45f004e9cc59 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -15,7 +15,7 @@ struct compat_timespec;
#ifdef CONFIG_THREAD_INFO_IN_TASK
struct thread_info {
- u32 flags; /* low level flags */
+ unsigned long flags; /* low level flags */
};
#define INIT_THREAD_INFO(tsk) \