http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45819
--- Comment #2 from Atsushi Nemoto <anemo at mba dot ocn.ne.jp> 2010-09-28
16:26:17 UTC ---
(In reply to comment #1)
> (why use packed if the int is always aligned?)
The original problem was found with this structure in linux ehci_def.h:
struct ehci_caps {
u32 hc_capbase;
u32 hcs_params; /* HCSPARAMS - offset 0x4 */
u32 hcc_params; /* HCCPARAMS - offset 0x8 */
u8 portroute [8]; /* nibbles for routing - offset 0xC */
} __attribute__ ((packed));
In this case maybe the "packed" is not needed, but there will be other cases
which require "packed" attribute on struct for memory-mapped I/O.
