Re: [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