Re: [PATCH] hugetlbfs: Take read_lock on i_mmap for PMD sharing

[Davidlohr Bueso]

On Thu, 07 Nov 2019, Mike Kravetz wrote:

> Note that huge_pmd_share now increments the page count with the semaphore
> held just in read mode.  It is OK to do increments in parallel without
> synchronization.  However, we don't want anyone else changing the count
> while that check in huge_pmd_unshare is happening.  Hence, the need for
> taking the semaphore in write mode.

This would be a nice addition to the changelog methinks.

Thanks,
Davidlohr