On Tue, Nov 05, 2019 at 01:23:46PM -0800, John Hubbard wrote:
> On 10/28/19 1:10 PM, Jason Gunthorpe wrote:
> > From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> >
> > Now that we have KERNEL_HEADER_TEST all headers are generally compile
> > tested, so relying on makefile tricks to avoid compiling code that depends
> > on CONFIG_MMU_NOTIFIER is more annoying.
> >
> > Instead follow the usual pattern and provide most of the header with only
> > the functions stubbed out when CONFIG_MMU_NOTIFIER is disabled. This
> > ensures code compiles no matter what the config setting is.
> >
> > While here, struct mmu_notifier_mm is private to mmu_notifier.c, move it.
>
> and correct a minor spelling error in a comment. Good. :)
>
> >
> > Reviewed-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
> > Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> > include/linux/mmu_notifier.h | 46 +++++++++++++-----------------------
> > mm/mmu_notifier.c | 13 ++++++++++
> > 2 files changed, 30 insertions(+), 29 deletions(-)
> >
>
> Because this is correct as-is, you can add:
>
> Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx>
>
Thanks
> diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
> index 2b7485919ecf..107f9406a92d 100644
> +++ b/mm/mmu_notifier.c
> @@ -47,6 +47,16 @@ struct mmu_notifier_mm {
> struct hlist_head deferred_list;
> };
>
> +int mm_has_notifiers(struct mm_struct *mm)
> +{
> + return unlikely(mm->mmu_notifier_mm);
> +}
This inline is performance sensitive, it needs to stay inlined..
Jason
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