Andrew Morton wrote:
On Thu, 22 Mar 2012 21:28:11 +0000
Al Viro<viro@xxxxxxxxxxxxxxxxxx> 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.
So what does __nocast do?
Actually it forbid any non-forced casts, but its implementation in sparse seems buggy:
__nocast generates some strange false positives. For example it sometimes forgot about
type attributes in function arguments, I saw this for vm_flags argument in ksm_madvise().
I can reproduce this bug, if somebody interested.
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