On Thu, Jan 10, 2019 at 08:29:00PM +0530, Souptick Joarder wrote: > convert to use vm_fault_t type as return type for > fault handler. > > kbuild reported warning during testing of > *mm-create-the-new-vm_fault_t-type.patch* available in below link - > https://patchwork.kernel.org/patch/10752741/ > > [auto build test WARNING on linus/master] > [also build test WARNING on v5.0-rc1 next-20190109] > [if your patch is applied to the wrong git tree, please drop us a note > to help improve the system] > > kernel/memremap.c:46:34: warning: incorrect type in return expression > (different base types) > kernel/memremap.c:46:34: expected restricted vm_fault_t > kernel/memremap.c:46:34: got int > > This patch has fixed the warnings and also hmm_devmem_fault() is > converted to return vm_fault_t to avoid further warnings. > > Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx> Reviewed-by: Jérôme Glisse <jglisse@xxxxxxxxxx> > --- > include/linux/hmm.h | 4 ++-- > mm/hmm.c | 2 +- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/include/linux/hmm.h b/include/linux/hmm.h > index 66f9ebb..ad50b7b 100644 > --- a/include/linux/hmm.h > +++ b/include/linux/hmm.h > @@ -468,7 +468,7 @@ struct hmm_devmem_ops { > * Note that mmap semaphore is held in read mode at least when this > * callback occurs, hence the vma is valid upon callback entry. > */ > - int (*fault)(struct hmm_devmem *devmem, > + vm_fault_t (*fault)(struct hmm_devmem *devmem, > struct vm_area_struct *vma, > unsigned long addr, > const struct page *page, > @@ -511,7 +511,7 @@ struct hmm_devmem_ops { > * chunk, as an optimization. It must, however, prioritize the faulting address > * over all the others. > */ > -typedef int (*dev_page_fault_t)(struct vm_area_struct *vma, > +typedef vm_fault_t (*dev_page_fault_t)(struct vm_area_struct *vma, > unsigned long addr, > const struct page *page, > unsigned int flags, > diff --git a/mm/hmm.c b/mm/hmm.c > index a04e4b8..fe1cd87 100644 > --- a/mm/hmm.c > +++ b/mm/hmm.c > @@ -990,7 +990,7 @@ static void hmm_devmem_ref_kill(struct percpu_ref *ref) > percpu_ref_kill(ref); > } > > -static int hmm_devmem_fault(struct vm_area_struct *vma, > +static vm_fault_t hmm_devmem_fault(struct vm_area_struct *vma, > unsigned long addr, > const struct page *page, > unsigned int flags, > -- > 1.9.1 >
