Messages in this thread | | | Date | Wed, 26 Jun 2019 08:57:51 +0200 | From | Michal Hocko <> | Subject | Re: [PATCH v2 1/3] mm: Trigger bug on if a section is not found in __section_nr |
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On Wed 26-06-19 16:27:30, Alastair D'Silva wrote: > On Wed, 2019-06-26 at 08:21 +0200, Michal Hocko wrote: > > On Wed 26-06-19 16:11:21, Alastair D'Silva wrote: > > > From: Alastair D'Silva <alastair@d-silva.org> > > > > > > If a memory section comes in where the physical address is greater > > > than > > > that which is managed by the kernel, this function would not > > > trigger the > > > bug and instead return a bogus section number. > > > > > > This patch tracks whether the section was actually found, and > > > triggers the > > > bug if not. > > > > Why do we want/need that? In other words the changelog should contina > > WHY and WHAT. This one contains only the later one. > > > > Thanks, I'll update the comment. > > During driver development, I tried adding peristent memory at a memory > address that exceeded the maximum permissable address for the platform. > > This caused __section_nr to silently return bogus section numbers, > rather than complaining.
OK, I see, but is an additional code worth it for the non-development case? I mean why should we be testing for something that shouldn't happen normally? Is it too easy to get things wrong or what is the underlying reason to change it now?
-- Michal Hocko SUSE Labs
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