linux-kernel - Re: [PATCH] compat_audit: allow it to work without asm/unistd32.h

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Date:	Mon, 24 Mar 2014 12:21:11 -0400
From:	Eric Paris <eparis@...hat.com>
To:	Chris Metcalf <cmetcalf@...era.com>
Cc:	linux-kernel@...r.kernel.org,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: Re: [PATCH] compat_audit: allow it to work without asm/unistd32.h

I don't know tilegx, but I have replaced 223b24d807610 with
4b58841149dcaa5.  I believe adding AUDIT_ARCH_COMPAT_GENERIC was
akashi-san's  fix for this problem on mips.  Is this a better fix?

Thanks
-Eric

On Thu, 2014-03-20 at 11:31 -0400, Chris Metcalf wrote:
> For architectures that use the asm-generic syscall table for both
> 32- and 64-bit, there should be no need to provide a separate
> <asm/unistd32.h>; just using <linux/unistd.h> is sufficient.
> Conditionalize use of <asm/unistd32.h> on the one platform that
> currently requires it (arm64).  If another platform ends up needing
> it we can create a suitable config flag at that point.
> 
> This change fixes the tilegx build failure seen in linux-next.
> 
> Signed-off-by: Chris Metcalf <cmetcalf@...era.com>
> ---
> By the way - I also note that commit 223b24d807610 that introduced
> this also put an "#ifdef COMPAT_xxx" in a UAPI header.  This seems
> like a pretty clear signal that the added code should be in
> linux/include/audit.h, not linux/uapi/include/audit.h.  But here
> I'm just focussing on getting tilegx to continue to build...
> 
>  lib/compat_audit.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/compat_audit.c b/lib/compat_audit.c
> index 873f75b640ab..e89a84b3fbe8 100644
> --- a/lib/compat_audit.c
> +++ b/lib/compat_audit.c
> @@ -1,6 +1,11 @@
>  #include <linux/init.h>
>  #include <linux/types.h>
> -#include <asm/unistd32.h>
> +#ifdef COMPAT_ARM64
> +/* 64-bit syscalls are generic, but 32-bit are not. */
> +# include <asm/unistd32.h>
> +#else
> +# include <linux/unistd.h>
> +#endif
>  
>  unsigned compat_dir_class[] = {
>  #include <asm-generic/audit_dir_write.h>


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