linux-kernel - Re: [PATCH v5 4/4] arm64: is_compat_task is defined both in asm/compat.h and linux/compat.h

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Date:	Sun, 16 Mar 2014 15:48:00 -0400
From:	Richard Guy Briggs <rgb@...hat.com>
To:	AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:	will.deacon@....com, viro@...iv.linux.org.uk, eparis@...hat.com,
	catalin.marinas@....com, dsaxena@...aro.org, arndb@...db.de,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-audit@...hat.com
Subject: Re: [PATCH v5 4/4] arm64: is_compat_task is defined both in
 asm/compat.h and linux/compat.h

On 14/03/15, AKASHI Takahiro wrote:
> Some kernel files may include both linux/compat.h and asm/compat.h directly
> or indirectly. Since both header files contain is_compat_task() under
> !CONFIG_COMPAT, compiling them with !CONFIG_COMPAT will eventually fail.
> Such files include kernel/auditsc.c, kernel/seccomp.c and init/do_mountfs.c
> (do_mountfs.c may read asm/compat.h via asm/ftrace.h once ftrace is
> implemented).
> 
> So this patch proactively
> 1) removes is_compat_task() under !CONFIG_COMPAT from asm/compat.h
> 2) replaces asm/compat.h to linux/compat.h in kernel/*.c,
>    but asm/compat.h is still necessary in ptrace.c and process.c because
>    they use is_compat_thread().
> 
> Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>

Acked-by: Richard Guy Briggs <rgb@...hat.com>

> ---
>  arch/arm64/include/asm/compat.h   | 5 -----
>  arch/arm64/kernel/hw_breakpoint.c | 2 +-
>  arch/arm64/kernel/process.c       | 1 +
>  arch/arm64/kernel/ptrace.c        | 1 +
>  arch/arm64/kernel/signal.c        | 2 +-
>  5 files changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/compat.h b/arch/arm64/include/asm/compat.h
> index fda2704..3b334f9 100644
> --- a/arch/arm64/include/asm/compat.h
> +++ b/arch/arm64/include/asm/compat.h
> @@ -305,11 +305,6 @@ static inline int is_compat_thread(struct thread_info *thread)
>  
>  #else /* !CONFIG_COMPAT */
>  
> -static inline int is_compat_task(void)
> -{
> -	return 0;
> -}
> -
>  static inline int is_compat_thread(struct thread_info *thread)
>  {
>  	return 0;
> diff --git a/arch/arm64/kernel/hw_breakpoint.c b/arch/arm64/kernel/hw_breakpoint.c
> index f17f581..a45e2db 100644
> --- a/arch/arm64/kernel/hw_breakpoint.c
> +++ b/arch/arm64/kernel/hw_breakpoint.c
> @@ -20,6 +20,7 @@
>  
>  #define pr_fmt(fmt) "hw-breakpoint: " fmt
>  
> +#include <linux/compat.h>
>  #include <linux/cpu_pm.h>
>  #include <linux/errno.h>
>  #include <linux/hw_breakpoint.h>
> @@ -27,7 +28,6 @@
>  #include <linux/ptrace.h>
>  #include <linux/smp.h>
>  
> -#include <asm/compat.h>
>  #include <asm/current.h>
>  #include <asm/debug-monitors.h>
>  #include <asm/hw_breakpoint.h>
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index 1c0a9be..fc8a387 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -20,6 +20,7 @@
>  
>  #include <stdarg.h>
>  
> +#include <linux/compat.h>
>  #include <linux/export.h>
>  #include <linux/sched.h>
>  #include <linux/kernel.h>
> diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
> index f606276..c47a3ed 100644
> --- a/arch/arm64/kernel/ptrace.c
> +++ b/arch/arm64/kernel/ptrace.c
> @@ -19,6 +19,7 @@
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <linux/compat.h>
>  #include <linux/kernel.h>
>  #include <linux/sched.h>
>  #include <linux/mm.h>
> diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
> index 890a591..4a09989 100644
> --- a/arch/arm64/kernel/signal.c
> +++ b/arch/arm64/kernel/signal.c
> @@ -17,6 +17,7 @@
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <linux/compat.h>
>  #include <linux/errno.h>
>  #include <linux/signal.h>
>  #include <linux/personality.h>
> @@ -25,7 +26,6 @@
>  #include <linux/tracehook.h>
>  #include <linux/ratelimit.h>
>  
> -#include <asm/compat.h>
>  #include <asm/debug-monitors.h>
>  #include <asm/elf.h>
>  #include <asm/cacheflush.h>
> -- 
> 1.8.3.2
> 

- RGB

--
Richard Guy Briggs <rbriggs@...hat.com>
Senior Software Engineer, Kernel Security, AMER ENG Base Operating Systems, Red Hat
Remote, Ottawa, Canada
Voice: +1.647.777.2635, Internal: (81) 32635, Alt: +1.613.693.0684x3545
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