Re: [Qemu-trivial] [Qemu-devel] [PATCH] net: Include iov.h in checksum.h

[Alexander Graf]

> Am 07.02.2014 um 08:05 schrieb Michael Tokarev <address@hidden>:
> 
> 06.02.2014 19:30, Alexander Graf wrote:
>> The checksum calculation header exports a function that refers to struct
>> iov which is defined in iov.h. Include the header so that the compiler
>> knows what this struct is about.
> 
> Alternatively (and I sometimes prefer it this way), one can just
> declare `struct iovec;' instead of including whole header, because
> we don't actually use any definitions from there, and users of
> checksum.h wont be including extra dependencies which they don't
> use...  Like this:

Either way works for me :)

Alex

> 
> --- cut ---
> Subject: net: declare struct iovec in checksum.h to fix compiler warning
> From: Michael Tokarev <address@hidden>
> 
> The checksum calculation header exports a function that refers to
> struct iov defined in iov.h.  Without including the former, build
> fails like this:
> 
>  In file included from hw/net/fsl_etsec/rings.c:24:0:
>  include/net/checksum.h:51:31: error: ‘struct iovec’ declared inside 
> parameter list [-Werror]
>  include/net/checksum.h:51:31: error: its scope is only this definition or 
> declaration, which is probably not what you want [-Werror]
> 
> Mention struct iovec there.
> 
> Signed-off-by: Michael Tokarev <address@hidden>
> 
> diff --git a/include/net/checksum.h b/include/net/checksum.h
> index 80203fb..2d7a363 100644
> --- a/include/net/checksum.h
> +++ b/include/net/checksum.h
> @@ -19,6 +19,7 @@
> #define QEMU_NET_CHECKSUM_H
> 
> #include <stdint.h>
> +struct iovec;
> 
> uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq);
> uint16_t net_checksum_finish(uint32_t sum);
> --- cut ---
> BTW, this is a -trivial matherial ;)
> 
> /mjt