On Fri, Aug 31, 2018 at 10:11:24AM +0200, Luc Van Oostenryck wrote:
On Thu, Aug 30, 2018 at 01:41:16PM +0200, Andrey Konovalov wrote:
This patch adds __force annotations for __user pointers casts detected by sparse with the -Wcast-from-as flag enabled (added in [1]).
[1] https://github.com/lucvoo/sparse-dev/commit/5f960cb10f56ec2017c128ef9d16060e...
Hi,
It would be nice to have some explanation for why these added __force are useful.
It would be even more useful if that series would either deal with the noise for real ("that's what we intend here, that's what we intend there, here's a primitive for such-and-such kind of cases, here we actually ought to pass __user pointer instead of unsigned long", etc.) or left it unmasked.
As it is, __force says only one thing: "I know the code is doing the right thing here". That belongs in primitives, and I do *not* mean the #define cast_to_ulong(x) ((__force unsigned long)(x)) kind.
Folks, if you don't want to deal with that - leave the warnings be. They do carry more information than "someone has slapped __force in that place".
Al, very annoyed by that kind of information-hiding crap...