Re: [PATCHv2] mm/gup: Cache dev_pagemap while pinning pages

[Keith Busch]

On Fri, Oct 12, 2018 at 09:58:18AM -0700, Dan Williams wrote:
> On Fri, Oct 12, 2018 at 4:00 AM Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
> [..]
> > > Does this have defined behavior? I would feel better with " = { 0 }"
> > > to be explicit.
> >
> > Well, it's not allowed by the standart, but GCC allows this.
> > You can see a warning with -pedantic.
> >
> > We use empty-list initializers a lot in the kernel:
> > $ git grep 'struct .*= {};' | wc -l
> > 997
> >
> > It should be fine.
> 
> Ah, ok. I would still say we should be consistent between the init
> syntax for 'ctx' in follow_page() and __get_user_pages(), and why not
> go with '= { 0 }', one less unnecessary gcc'ism.

No problem, I'll make that happen and copy your reviews/acks into the
next patch.