Messages in this thread | | | Date | Sat, 28 Jul 2007 03:39:51 +0200 | From | Adrian Bunk <> | Subject | scripts/mod/file2alias.c cross compile problem |
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On Fri, Jul 27, 2007 at 04:21:47PM -0700, Luck, Tony wrote: > > So it seems on ia64 with gcc 3.3.6 there's some 8 byte alignment of the > > array members? > > > > Sam and the ia64 maintainers Cc'ed - they might know better what's going > > on here. > > This ia64 maintainer is baffled ... but I don't see the problem here (perhaps > because my build machine has gcc 3.4.6).
I found what causes this problem, and it only occurs during cross compilation.
The struct is:
#define ACPI_ID_LEN 9
struct acpi_device_id { __u8 id[ACPI_ID_LEN]; kernel_ulong_t driver_data; };
When compiling for ia64, this results in:
struct acpi_device_id { __u8 id[9]; uint64_t driver_data; };
sizeof(struct acpi_device_id) for ia64 is due to different padding after id[] 20 bytes on i386 but 24 bytes on ia64.
scripts/mod/file2alias.c is compiled with HOSTCC and ensures that kernel_ulong_t is correct (in this case uint64_t for ia64), but it can't cope with different padding on different architectures.
> -Tony
cu Adrian
--
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