2021-04-13 08:41:30

by Axel Rasmussen

Subject: [PATCH v2 1/9] userfaultfd/hugetlbfs: avoid including userfaultfd_k.h in hugetlb.h

Minimizing header file inclusion is desirable. In this case, we can do
so just by forward declaring the enumeration our signature relies upon.

Reviewed-by: Peter Xu <[email protected]>
Signed-off-by: Axel Rasmussen <[email protected]>
---
include/linux/hugetlb.h | 4 +++-
mm/hugetlb.c | 1 +
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 09f1fd12a6fa..3f47650ab79b 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -11,7 +11,6 @@
#include <linux/kref.h>
#include <linux/pgtable.h>
#include <linux/gfp.h>
-#include <linux/userfaultfd_k.h>

struct ctl_table;
struct user_struct;
@@ -135,6 +134,8 @@ void hugetlb_show_meminfo(void);
unsigned long hugetlb_total_pages(void);
vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long address, unsigned int flags);
+
+enum mcopy_atomic_mode;
#ifdef CONFIG_USERFAULTFD
int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
struct vm_area_struct *dst_vma,
@@ -143,6 +144,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
enum mcopy_atomic_mode mode,
struct page **pagep);
#endif /* CONFIG_USERFAULTFD */
+
bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
struct vm_area_struct *vma,
vm_flags_t vm_flags);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 54d81d5947ed..b1652e747318 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -40,6 +40,7 @@
#include <linux/hugetlb_cgroup.h>
#include <linux/node.h>
#include <linux/page_owner.h>
+#include <linux/userfaultfd_k.h>
#include "internal.h"

int hugetlb_max_hstate __read_mostly;
--
2.31.1.295.g9ea45b61b8-goog

2021-04-14 13:55:29

by Hugh Dickins

Subject: Re: [PATCH v2 1/9] userfaultfd/hugetlbfs: avoid including userfaultfd_k.h in hugetlb.h

On Mon, 12 Apr 2021, Axel Rasmussen wrote:

> Minimizing header file inclusion is desirable. In this case, we can do
> so just by forward declaring the enumeration our signature relies upon.
>
> Reviewed-by: Peter Xu <[email protected]>
> Signed-off-by: Axel Rasmussen <[email protected]>
> ---
> include/linux/hugetlb.h | 4 +++-
> mm/hugetlb.c | 1 +
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 09f1fd12a6fa..3f47650ab79b 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -11,7 +11,6 @@
> #include <linux/kref.h>
> #include <linux/pgtable.h>
> #include <linux/gfp.h>
> -#include <linux/userfaultfd_k.h>
>
> struct ctl_table;
> struct user_struct;
> @@ -135,6 +134,8 @@ void hugetlb_show_meminfo(void);
> unsigned long hugetlb_total_pages(void);
> vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
> unsigned long address, unsigned int flags);
> +
> +enum mcopy_atomic_mode;

Wrongly placed: the CONFIG_USERFAULTFD=y CONFIG_HUGETLB_PAGE=n build
fails. Better place it up above with struct ctl_table etc.

> #ifdef CONFIG_USERFAULTFD
> int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
> struct vm_area_struct *dst_vma,
> @@ -143,6 +144,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm, pte_t *dst_pte,
> enum mcopy_atomic_mode mode,
> struct page **pagep);
> #endif /* CONFIG_USERFAULTFD */
> +
> bool hugetlb_reserve_pages(struct inode *inode, long from, long to,
> struct vm_area_struct *vma,
> vm_flags_t vm_flags);
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 54d81d5947ed..b1652e747318 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -40,6 +40,7 @@
> #include <linux/hugetlb_cgroup.h>
> #include <linux/node.h>
> #include <linux/page_owner.h>
> +#include <linux/userfaultfd_k.h>
> #include "internal.h"
>
> int hugetlb_max_hstate __read_mostly;
> --
> 2.31.1.295.g9ea45b61b8-goog
>
>