[lkml]   [2010]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC][PATCH] introduce ptr_diff()
Namhyung Kim <> writes:

> When I compiled allyesconfig'ed kernel with C=1, I got 1519 lines of
> following message:
> include/linux/mm.h:599:16: warning: potentially expensive pointer subtraction
> which is around 10% of total warnings. this was caused by page_to_pfn() macro
> so I think it's worth to remove it by calculating pointer subtraction
> manually.

IMHO it would be better to simply disable the warning in sparse instead
of uglying the code just to work around sparse bogosity. It doesnt' seem
to make much sense. A subtraction followed by a shift is not expensive.


-- -- Speaking for myself only.

 \ /
  Last update: 2010-08-19 14:25    [W:0.083 / U:1.544 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site