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authorMark Rutland <mark.rutland@arm.com>2016-10-19 21:28:13 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2016-11-11 21:25:08 +0300
commitdc3d2a679cd8631b8a570fc8ca5f4712d7d25698 (patch)
tree206f033865e791ba50d3dd20407b5ebb9109caa9 /include/linux/thread_info.h
parent53d74d056a4e306a72b8883d325b5d853c0618e6 (diff)
downloadlinux-dc3d2a679cd8631b8a570fc8ca5f4712d7d25698.tar.xz
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>
Diffstat (limited to 'include/linux/thread_info.h')
-rw-r--r--include/linux/thread_info.h6
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