Re: linux-next: Tree for Nov 7
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From: Michal Hocko <mhocko@kernel.org>
Date: 2017-11-13 15:49:45
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linux-arm-kernel, linux-mips, linux-next, linux-sh, lkml, sparclinux
On Mon 13-11-17 16:16:41, Michal Hocko wrote:
On Mon 13-11-17 13:00:57, Michal Hocko wrote: [...]quoted
Yes, I have mentioned that in the previous email but the amount of code would be even larger. Basically every arch which reimplements arch_get_unmapped_area would have to special case new MAP_FIXED flag to do vma lookup.It turned out that this might be much more easier than I thought after all. It seems we can really handle that in the common code. This would mean that we are exposing a new functionality to the userspace though. Myabe this would be useful on its own though. Just a quick draft (not even compile tested) whether this makes sense in general. I would be worried about unexpected behavior when somebody set other bit without a good reason and we might fail with ENOMEM for such a call now.
Hmm, the bigger problem would be the backward compatibility actually. We would get silent corruptions which is exactly what the flag is trying fix. mmap flags handling really sucks. So I guess we would have to make the flag internal only :/ -- Michal Hocko SUSE Labs