Re: [RFC v2] Documentation about unaligned memory access

From: Johannes Berg
Date: Mon Dec 03 2007 - 05:36:20 EST



> void myfunc(u8 *data, u32 value)
> {
> [...]
> value = cpu_to_le32(value);
> put_unaligned(value, data);

> u32 value = get_unaligned(data);

Actually, this is wrong. put_unaligned and get_unaligned use the type of
the "data" pointer, e.g. on powerpc get_unaligned does just "*data".

Hence, here you'll want to use

put_unaligned(value, (u32 *)data);

and

u32 value = get_unaligned((u32 *)data);

or you end up with a single-byte store/load.

johannes

Attachment: signature.asc
Description: This is a digitally signed message part