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[BYTEORDER]: Document alignment and byteorder macros 

This patch comments the fact that although passing le64_to_cpup et
al. is within the intended use of the byteorder macros, using
get_unaligned is the recommended way to go.

Signed-off-by: Ed L. Cashin <ecashin@coraid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ed L. Cashin 2005-09-19 19:57:36 -07:00 committed by David S. Miller
parent ff171d8f66
commit e0487992ce
1 changed files with 4 additions and 0 deletions
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4
include/linux/byteorder/generic.h
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@ -5,6 +5,10 @@
* linux/byteorder_generic.h
* Generic Byte-reordering support
*
* The "... p" macros, like le64_to_cpup, can be used with pointers
* to unaligned data, but there will be a performance penalty on
* some architectures. Use get_unaligned for unaligned data.
*
* Francois-Rene Rideau <fare@tunes.org> 19970707
* gathered all the good ideas from all asm-foo/byteorder.h into one file,
* cleaned them up.