Re: [PATCH] powerpc: restore current_thread_info()

From: Al Viro
Date: Tue May 07 2019 - 19:00:21 EST

On Tue, May 07, 2019 at 03:51:21PM -0700, Yury Norov wrote:
> Commit ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK")
> removes the function current_thread_info(). It's wrong because the
> function is used in non-arch code and is part of API.

In include/linux/thread_info.h:

* 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)