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From: Roland Dreier <roland@topspin.com>
To: linux-kernel@vger.kernel.org
Subject: What types are the parameters of memcpy_toio?
Date: 16 May 2004 21:03:29 -0700	[thread overview]
Message-ID: <52lljrwvhq.fsf@topspin.com> (raw)

This may be a silly question, but what are the types of the parameters
of memcpy_toio and memcpy_fromio?  I was under the impression that IO
addresses are "cookies" and not pointers, and hence should be kept as
unsigned long.

However, <asm-x86_64/io.h> declares them as

void *memcpy_fromio(void*,const void*,unsigned); 
void *memcpy_toio(void*,const void*,unsigned); 

which means my code (which uses unsigned long) gets warnings like

warning: passing arg 1 of `memcpy_toio' makes pointer from integer without a cast

Other architectures seem to expect the IO address to be unsigned long
and explicitly cast it to a pointer.

Thanks,
  Roland

             reply	other threads:[~2004-05-17  4:03 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2004-05-17  4:03 Roland Dreier [this message]
2004-05-17 18:28 ` memcpy_to/fromio cleanups for x86_64 Roland Dreier

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