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Date: Sun, 13 May 2007 20:27:35 -0300
From: Arnaldo Carvalho de Melo <acme@...hat.com>
To: Muli Ben-Yehuda <muli@...ibm.com>
CC: David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: compile breakage due to [SK_BUFF]: Convert skb->end to sk_buff_data_t
Muli Ben-Yehuda wrote:
> On Fri, Apr 27, 2007 at 05:03:44PM +0000, Linux Kernel Mailing List wrote:
>
>
>> Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4305b541357ddbd205aa145dc378926b7cb12283
>> Commit: 4305b541357ddbd205aa145dc378926b7cb12283
>> Parent: 27a884dc3cb63b93c2b3b643f5b31eed5f8a4d26
>> Author: Arnaldo Carvalho de Melo <acme@...hat.com>
>> AuthorDate: Thu Apr 19 20:43:29 2007 -0700
>> Committer: David S. Miller <davem@...set.davemloft.net>
>> CommitDate: Wed Apr 25 22:26:29 2007 -0700
>>
>> [SK_BUFF]: Convert skb->end to sk_buff_data_t
>>
>> Now to convert the last one, skb->data, that will allow many simplifications
>> and removal of some of the offset helpers.
>>
>> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
>> Signed-off-by: David S. Miller <davem@...emloft.net>
>>
>
> This patch and the previous one breaks the compilation on one of my
> machines. Specifically, this bit:
>
>
>> @@ -632,12 +644,13 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
>> /* Copy only real data... and, alas, header. This should be
>> * optimized for the cases when header is void. */
>> memcpy(data + nhead, skb->head,
>> - skb->tail
>> -#ifndef NET_SKBUFF_DATA_USES_OFFSET
>> - - skb->head
>> +#ifdef NET_SKBUFF_DATA_USES_OFFSET
>> + skb->tail);
>> +#else
>> + skb->tail - skb->head);
>> #endif
>> - );
>> - memcpy(data + size, skb->end, sizeof(struct skb_shared_info));
>> + memcpy(data + size, skb_end_pointer(skb),
>> + sizeof(struct skb_shared_info));
>>
>> for (i = 0; i < skb_shinfo(skb)->nr_frags; i++)
>> get_page(skb_shinfo(skb)->frags[i].page);
>>
>
> Causes this compile error:
>
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c:648:1: directives may not be used inside a macro argument
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c:647:39: unterminated argument list invoking macro "memcpy"
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c: In function `pskb_expand_head':
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c:651: `memcpy' undeclared (first use in this function)
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c:651: (Each undeclared identifier is reported only once
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c:651: for each function it appears in.)
> /home/muli/kernel/trident/trident.git/net/core/skbuff.c:651: syntax error before "skb"
>
> muli@...n:~/kernel/trident/trident.git$ gcc -v
> Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux
> Thread model: posix
> gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-53)
>
> It happens because memcpy ends up being a macro, and this gcc dislikes
> having a preprocessor directive inside a macro argument. I don't know
> if if it's valid in general, but Documentation/Changes does say we
> still support gcc 3.2...
>
Well, the fix is easy, can you provide a patch?
- Arnaldo
-
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