linux-kernel - Re: [PATCH v06 08/36] uapi asm-generic/shmbuf.h: include fixes

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Message-ID: <20170808224253.GB10552@altlinux.org>
Date:   Wed, 9 Aug 2017 01:42:53 +0300
From:   "Dmitry V. Levin" <ldv@...linux.org>
To:     Mikko Rapeli <mikko.rapeli@....fi>
Cc:     linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        "H . J . Lu" <hjl.tools@...il.com>,
        "H . Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH v06 08/36] uapi asm-generic/shmbuf.h: include fixes

On Sun, Aug 06, 2017 at 06:43:59PM +0200, Mikko Rapeli wrote:
> Include linux/types.h and asm/msgbuf.h and use __kernel_size_t instead
> of size_t.
> 
> Fixes userspace compilation errors like:
> 
> error: field ‘shm_perm’ has incomplete type
> struct ipc64_perm shm_perm; /* operation perms */
> error: unknown type name ‘size_t’
> error: unknown type name ‘__kernel_time_t’
> 
> Signed-off-by: Mikko Rapeli <mikko.rapeli@....fi>
> Acked-by: Arnd Bergmann <arnd@...db.de>
> Cc: H.J. Lu <hjl.tools@...il.com>
> Cc: H. Peter Anvin <hpa@...or.com>
> ---
>  include/uapi/asm-generic/shmbuf.h | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/include/uapi/asm-generic/shmbuf.h b/include/uapi/asm-generic/shmbuf.h
> index 7e9fb2f0853b..ae867ad1e5e4 100644
> --- a/include/uapi/asm-generic/shmbuf.h
> +++ b/include/uapi/asm-generic/shmbuf.h
> @@ -1,7 +1,9 @@
>  #ifndef __ASM_GENERIC_SHMBUF_H
>  #define __ASM_GENERIC_SHMBUF_H
>  
> +#include <linux/types.h>
>  #include <asm/bitsperlong.h>
> +#include <asm/msgbuf.h>
>  
>  /*
>   * The shmid64_ds structure for x86 architecture.
> @@ -24,7 +26,7 @@
>  
>  struct shmid64_ds {
>  	struct ipc64_perm	shm_perm;	/* operation perms */
> -	size_t			shm_segsz;	/* size of segment (bytes) */
> +	__kernel_size_t		shm_segsz;	/* size of segment (bytes) */
>  	__kernel_time_t		shm_atime;	/* last attach time */
>  #if __BITS_PER_LONG != 64
>  	unsigned long		__unused1;

Surprisingly enough, this replacement of size_t with __kernel_size_t
is not just correct, it's a fix for a more subtle bug on x32, see
http://lkml.kernel.org/r/20170302004607.GE27132@altlinux.org

I recommend splitting the change into "include" fix and "size_t" fix
like I did some time ago, see
http://lkml.kernel.org/r/20170302002253.GC27132@altlinux.org


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