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SubjectRe: [patch v2] mremap.2: Add description of old_size == 0 functionality
On Wed 20-09-17 09:25:42, Michael Kerrisk wrote:
[...]
> BUGS
> Before Linux 4.14, if old_size was zero and the mapping referred
> to by old_address was a private mapping (mmap(2) MAP_PRIVATE),
> mremap() created a new private mapping unrelated to the original
> mapping. This behavior was unintended and probably unexpected in
> user-space applications (since the intention of mremap() is to
> create a new mapping based on the original mapping). Since Linux
> 4.14, mremap() fails with the error EINVAL in this scenario.
>
> Does that seem okay?

sorry to be late but yes this wording makes perfect sense to me.
--
Michal Hocko
SUSE Labs

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