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

From: Stephen Rothwell <[email-masked]>
Date: Mon, 24 Jun 2019 21:06:59 +1000

Hi all,

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

-- 
Cheers,
Stephen Rothwell