Subject: Re: linux-next: manual merge of the akpm-current tree with the drm tree

From: Stephen Rothwell <[email-masked]>
Date: Tue, 9 Jul 2019 10:06:45 +1000

Hi all,

On Mon, 24 Jun 2019 21:06:59 +1000 Stephen Rothwell <[email-masked]> wrote:
>
> On Mon, 24 Jun 2019 20:49:08 +1000 Stephen Rothwell <[email-masked]> wrote:
> >
> > Today's linux-next merge of the akpm-current tree got a conflict in:
> > 
> >   mm/memory.c
> > 
> > between commit:
> > 
> >   29875a52915e ("mm: Add an apply_to_pfn_range interface")
> > 
> > from the drm tree and commit:
> > 
> >   e972cea08fb3 ("mm/pgtable: drop pgtable_t variable from pte_fn_t functions")
> > 
> > from the akpm-current tree.
> > 
> > I fixed it up (see below my signature, then added the following merge
> > resolution patch as well) and can carry the fix as necessary. This
> > is now fixed as far as linux-next is concerned, but any non trivial
> > conflicts should be mentioned to your upstream maintainer when your tree
> > is submitted for merging.  You may also want to consider cooperating
> > with the maintainer of the conflicting tree to minimise any particularly
> > complex conflicts.
> > 
> > From: Stephen Rothwell <[email-masked]>
> > Date: Mon, 24 Jun 2019 20:40:46 +1000
> > Subject: [PATCH] merge fixup for "mm: Add an apply_to_pfn_range interface"
> > 
> > Signed-off-by: Stephen Rothwell <[email-masked]>
> > ---
> >  include/linux/mm.h    | 2 +-
> >  mm/as_dirty_helpers.c | 8 ++------
> >  2 files changed, 3 insertions(+), 7 deletions(-)
> > 
> > diff --git a/include/linux/mm.h b/include/linux/mm.h
> > index 87d53de3dee4..4404e18443ef 100644
> > --- a/include/linux/mm.h
> > +++ b/include/linux/mm.h
> > @@ -2673,7 +2673,7 @@ extern int apply_to_page_range(struct mm_struct *mm, unsigned long address,
> >  			       unsigned long size, pte_fn_t fn, void *data);
> >  
> >  struct pfn_range_apply;
> > -typedef int (*pter_fn_t)(pte_t *pte, pgtable_t token, unsigned long addr,
> > +typedef int (*pter_fn_t)(pte_t *pte, unsigned long addr,
> >  			 struct pfn_range_apply *closure);
> >  struct pfn_range_apply {
> >  	struct mm_struct *mm;
> > diff --git a/mm/as_dirty_helpers.c b/mm/as_dirty_helpers.c
> > index f600e31534fb..7c863626c2a4 100644
> > --- a/mm/as_dirty_helpers.c
> > +++ b/mm/as_dirty_helpers.c
> > @@ -26,7 +26,6 @@ struct apply_as {
> >  /**
> >   * apply_pt_wrprotect - Leaf pte callback to write-protect a pte
> >   * @pte: Pointer to the pte
> > - * @token: Page table token, see apply_to_pfn_range()
> >   * @addr: The virtual page address
> >   * @closure: Pointer to a struct pfn_range_apply embedded in a
> >   * struct apply_as
> > @@ -36,8 +35,7 @@ struct apply_as {
> >   *
> >   * Return: Always zero.
> >   */
> > -static int apply_pt_wrprotect(pte_t *pte, pgtable_t token,
> > -			      unsigned long addr,
> > +static int apply_pt_wrprotect(pte_t *pte, unsigned long addr,
> >  			      struct pfn_range_apply *closure)
> >  {
> >  	struct apply_as *aas = container_of(closure, typeof(*aas), base);
> > @@ -78,7 +76,6 @@ struct apply_as_clean {
> >  /**
> >   * apply_pt_clean - Leaf pte callback to clean a pte
> >   * @pte: Pointer to the pte
> > - * @token: Page table token, see apply_to_pfn_range()
> >   * @addr: The virtual page address
> >   * @closure: Pointer to a struct pfn_range_apply embedded in a
> >   * struct apply_as_clean
> > @@ -91,8 +88,7 @@ struct apply_as_clean {
> >   *
> >   * Return: Always zero.
> >   */
> > -static int apply_pt_clean(pte_t *pte, pgtable_t token,
> > -			  unsigned long addr,
> > +static int apply_pt_clean(pte_t *pte, unsigned long addr,
> >  			  struct pfn_range_apply *closure)
> >  {
> >  	struct apply_as *aas = container_of(closure, typeof(*aas), base);
> > -- 
> > 2.20.1
> > 
> > -- 
> > Cheers,
> > Stephen Rothwell
> > 
> > diff --cc mm/memory.c
> > index 462aa47f8878,f8a75528658a..e7e37fcbd687
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@@ -2037,12 -2036,11 +2035,11 @@@ static int apply_to_pte_range(struct pf
> >   {
> >   	pte_t *pte;
> >   	int err;
> > - 	pgtable_t token;
> >   	spinlock_t *uninitialized_var(ptl);
> >   
> >  -	pte = (mm == &init_mm) ?
> >  +	pte = (closure->mm == &init_mm) ?
> >   		pte_alloc_kernel(pmd, addr) :
> >  -		pte_alloc_map_lock(mm, pmd, addr, &ptl);
> >  +		pte_alloc_map_lock(closure->mm, pmd, addr, &ptl);
> >   	if (!pte)
> >   		return -ENOMEM;
> >   
> > @@@ -2050,10 -2048,8 +2047,8 @@@
> >   
> >   	arch_enter_lazy_mmu_mode();
> >   
> > - 	token = pmd_pgtable(*pmd);
> > - 
> >   	do {
> > - 		err = closure->ptefn(pte++, token, addr, closure);
> >  -		err = fn(pte++, addr, data);
> > ++		err = closure->ptefn(pte++, addr, closure);
> >   		if (err)
> >   			break;
> >   	} while (addr += PAGE_SIZE, addr != end);  
> 
> I also needed this:
> 
> From: Stephen Rothwell <[email-masked]>
> Date: Mon, 24 Jun 2019 21:04:14 +1000
> Subject: [PATCH] another fixup for "mm: Add an apply_to_pfn_range interface"
> 
> Signed-off-by: Stephen Rothwell <[email-masked]>
> ---
>  mm/memory.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/memory.c b/mm/memory.c
> index e7e37fcbd687..81d71fbfca5a 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -2189,14 +2189,13 @@ struct page_range_apply {
>   * Callback wrapper to enable use of apply_to_pfn_range for
>   * the apply_to_page_range interface
>   */
> -static int apply_to_page_range_wrapper(pte_t *pte, pgtable_t token,
> -				       unsigned long addr,
> +static int apply_to_page_range_wrapper(pte_t *pte, unsigned long addr,
>  				       struct pfn_range_apply *pter)
>  {
>  	struct page_range_apply *pra =
>  		container_of(pter, typeof(*pra), pter);
>  
> -	return pra->fn(pte, token, addr, pra->data);
> +	return pra->fn(pte, addr, pra->data);
>  }
>  
>  /*
> -- 
> 2.20.1

I am still getting this conflict (the commit ids may have changed).
Just a reminder in case you think Linus may need to know.

-- 
Cheers,
Stephen Rothwell