lkml.org 
[lkml]   [2020]   [Aug]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] overflow: Add __must_check attribute to check_*() helpers
From
Date
On 13/08/2020 13.23, Matthew Wilcox wrote:
> On Wed, Aug 12, 2020 at 02:51:52PM -0700, Kees Cook wrote:
>> +/*
>> + * Allows to effectively us apply __must_check to a macro so we can have
>> + * both the type-agnostic benefits of the macros while also being able to
>> + * enforce that the return value is, in fact, checked.
>> + */
>> +static inline bool __must_check __must_check_bool(bool condition)
>> +{
>> + return unlikely(condition);
>> +}
>
> I'm fine with the concept, but this is a weirdly-generically-named
> function that has a very specific unlikely() in it. So I'd call
> this __must_check_overflow() and then it's obvious that overflow is
> unlikely(), whereas it's not obvious that __must_check_bool() is going
> to be unlikely().

Incidentally, __must_check_overflow was what was actually Suggested-by
me - though I didn't think too hard about that name, I certainly agree
with your reasoning.

I still don't know if (un)likely annotations actually matter when used
this way, but at least the same pattern is used in kernel/sched/, so
probably.

Rasmus

\
 
 \ /
  Last update: 2020-08-13 13:34    [W:0.069 / U:1.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site