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| author | Mark Rutland <mark.rutland@arm.com> | 2016-10-19 19:28:13 +0100 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-11 18:25:08 +0000 |
| commit | dc3d2a679cd8631b8a570fc8ca5f4712d7d25698 (patch) | |
| tree | 206f033865e791ba50d3dd20407b5ebb9109caa9 | |
| parent | 53d74d056a4e306a72b8883d325b5d853c0618e6 (diff) | |
| download | linux-dc3d2a679cd8631b8a570fc8ca5f4712d7d25698.tar.gz | |
thread_info: include <current.h> for THREAD_INFO_IN_TASK
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>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
| -rw-r--r-- | include/linux/thread_info.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/thread_info.h b/include/linux/thread_info.h index c75c6ab364ca..58373875e8ee 100644 --- a/include/linux/thread_info.h +++ b/include/linux/thread_info.h @@ -12,6 +12,12 @@ #include <linux/restart_block.h> #ifdef CONFIG_THREAD_INFO_IN_TASK +/* + * For CONFIG_THREAD_INFO_IN_TASK kernels we need <asm/current.h> for the + * definition of current, but for !CONFIG_THREAD_INFO_IN_TASK kernels, + * including <asm/current.h> can cause a circular dependency on some platforms. + */ +#include <asm/current.h> #define current_thread_info() ((struct thread_info *)current) #endif |