Messages in this thread | | | From | Michael Buesch <> | Subject | Re: [RFC] [PATCH] Fix b43 driver build for arm | Date | Sat, 23 Feb 2008 06:51:09 +0100 |
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On Saturday 23 February 2008, Gordon Farquharson wrote: > On Fri, Feb 22, 2008 at 7:07 AM, Michael Buesch <mb@bu3sch.de> wrote: > > On Friday 22 February 2008 05:24:32 Gordon Farquharson wrote: > > > On Wed, Feb 20, 2008 at 12:37 PM, Sam Ravnborg <sam@ravnborg.org> wrote: > > > > > > > Option 1) is the worst of the three as that can cost > > > > of many hours bug-hunting. > > > > Option 3) may seem optimal but I do not like to add more > > > > complexity to this part of the build. And really I do not > > > > know a reliable way to detech when we do cross builds anyway. > > > > > > > > Leaving us with option 2) that is simple, strighforward and harmless. > > > > > > Are you willing to sign off on and commit the patch? > > > > Only with a big fat comment added that the alignment is only needed > > because of a broken sanity check in file2alias.c. > > How about this? > > --- > > Align the members of the SSB device structure to a 32 bit boundary so > that the b43 driver can be built for arm using a cross compiler. This > change is required so that the test in scripts/mod/file2alias.c that > checks that the size of the device ID type against the size of the > section in the object file succeeds (see > http://lkml.org/lkml/2008/2/18/481 for discussion). > > Signed-off-by: Gordon Farquharson <gordonfarquharson@gmail.com> > > --- > > diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h > index 139d49d..93083ad 100644 > --- a/include/linux/mod_devicetable.h > +++ b/include/linux/mod_devicetable.h > @@ -351,7 +351,9 @@ struct sdio_device_id { > struct ssb_device_id { > __u16 vendor; > __u16 coreid; > - __u8 revision; > + /* Explicit padding to support cross-compilation. */
A big fat comment is something like that:
/* Explicit padding to support a broken sanity check in file2alias.c. * The check will compare the size of the structure in the kernel * object file to the userspace the kernel is compiled on. * This breaks on cross-compilation. This padding is a workaround * for this. */
> + __u8 revision > + __attribute__((aligned(sizeof(__u32)))); > }; > #define SSB_DEVICE(_vendor, _coreid, _revision) \ > { .vendor = _vendor, .coreid = _coreid, .revision = _revision, } >
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