Messages in this thread | | | Date | Sat, 16 Dec 2017 12:52:27 +0100 | From | Michal Hocko <> | Subject | Re: [PATCH resend] mm/page_alloc: fix comment is __get_free_pages |
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On Fri 15-12-17 12:57:35, Andrew Morton wrote: > On Fri, 15 Dec 2017 10:36:18 +0100 Michal Hocko <mhocko@kernel.org> wrote: > > > > > > > > > So do we care and I will resend the patch in that case or I just drop > > > > this from my patch queue? > > > > > > Well.. I still think that silently accepting bad input would be bad > > > practice. If we can just delete the assertion and have such a caller > > > reliably blow up later on then that's good enough. > > > > The point is that if the caller checks for the failed allocation then > > the result is a memory leak. > > That's if page_address(highmem page) returns NULL. I'm not sure what > it returns, really - so many different implementations across so many > different architectures.
I am not sure I follow. We only do care for HIGHMEM, right? And that one returns NULL unless the high mem page is not kmaped.
> Oh well, it would have been nice to remove that VM_BUG_ON(). Why not > just leave the code as it is now?
BUGing on a bogus usage is not popular anymore. Also checking for something nobody actually does is a bit pointless. I will not insist though.
-- Michal Hocko SUSE Labs
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