Re: [PATCH 00/16] mm: prepare for converting vm->vm_flags to 64-bit
From: KOSAKI Motohiro
Date: Wed Mar 28 2012 - 13:29:04 EST
On 3/22/2012 5:28 PM, Al Viro wrote:
> On Thu, Mar 22, 2012 at 02:26:47PM -0700, Andrew Morton wrote:
>> It would be nice to find some way of triggering compiler warnings or
>> sparse warnings if someone mixes a 32-bit type with a vm_flags_t. Any
>> thoughts on this?
>> (Maybe that's what __nocast does, but Documentation/sparse.txt doesn't
>> describe it)
> Use __bitwise for that - check how gfp_t is handled.
If now we activate __bitwise, really plenty driver start create lots warnings.
Does it make sense?
In fact, x86-32 keep 32bit vma_t forever. thus all x86 specific driver don't
need any change. Moreover many ancient drivers has no maintainer and I can't
expect such driver will be fixed even though a warning occur.
So, I think __nocast weakness is better than strict __bitwise annotation for
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/