Re: [PATCH] Fix OOPS in mmap_region() when merging adjacent VM_LOCKED file segments

Linus Torvalds
2009-02-02T22:14:43Z

On Mon, 2 Feb 2009, Mel Gorman wrote:
>
> Lets say someone does the following
>
> 1. mmap(PROT_READ, MAP_PRIVATE) on a hugetlbfs file
> VM_ACCOUNT is not set for hugetlbfs
> VM_NORESERVE is not set because MAP_NORESERVE was not there

But isn't this exactly the thing that we have that odd "accountable" flag
for, and we do the whole

if (!accountable)
vm_flags |= VM_NORESERVE;

in mmap_region() for?

So VM_NORESERVE _will_ be set.

Linus