[RFC,1/8] thread_info: include <current.h> for THREAD_INFO_IN_TASK
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Message ID 1473947349-14521-2-git-send-email-mark.rutland@arm.com
State New
Headers show

Commit Message

Mark Rutland Sept. 15, 2016, 1:49 p.m. UTC
When CONFIG_THREAD_INFO_IN_TASK is selected, the current_thread_info()
macro relies on current having been defined prior to its use. However,
not all users of current_thread_info() include <asm/current.h>, and thus
current is not guaranteed to be defined.

When CONFIG_THREAD_INFO_IN_TASK is not selected, it's possible that
get_current() / current are based upon current_thread_info(), and
<asm/current.h> includes <asm/thread_info.h>. Thus always including
<asm/current.h> would result in circular dependences on some platforms.

To ensure both cases work, this patch includes <asm/current.h>, but only
when CONFIG_THREAD_INFO_IN_TASK is selected.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
---
 include/linux/thread_info.h | 1 +
 1 file changed, 1 insertion(+)

Patch
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diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h
index cb0ed34..d9622f7 100644
--- a/include/linux/thread_info.h
+++ b/include/linux/thread_info.h
@@ -25,6 +25,7 @@  struct thread_info {
 #endif
 
 #ifdef CONFIG_THREAD_INFO_IN_TASK
+#include <asm/current.h>
 #define current_thread_info() ((struct thread_info *)current)
 #endif