linux-kernel - Re: [PATCH 08/29] selftests/mm: Use PM_* macros in vm

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Date:   Fri, 7 Apr 2023 12:28:33 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Leonardo Bras Soares Passos <lsoaresp@...hat.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH 08/29] selftests/mm: Use PM_* macros in vm_utils.h

On Thu, Mar 30, 2023 at 12:07:08PM -0400, Peter Xu wrote:
> We've got the macros in uffd-stress.c, move it over and use it in
> vm_util.h.
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>

Reviewed-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
>  tools/testing/selftests/mm/userfaultfd.c |  8 --------
>  tools/testing/selftests/mm/vm_util.c     | 16 ++++------------
>  tools/testing/selftests/mm/vm_util.h     |  8 ++++++++
>  3 files changed, 12 insertions(+), 20 deletions(-)
> 
> diff --git a/tools/testing/selftests/mm/userfaultfd.c b/tools/testing/selftests/mm/userfaultfd.c
> index 4cc80a0e8955..7e841f7e2884 100644
> --- a/tools/testing/selftests/mm/userfaultfd.c
> +++ b/tools/testing/selftests/mm/userfaultfd.c
> @@ -1389,14 +1389,6 @@ static int userfaultfd_minor_test(void)
>  	return stats.missing_faults != 0 || stats.minor_faults != nr_pages;
>  }
> 
> -#define BIT_ULL(nr)                   (1ULL << (nr))
> -#define PM_SOFT_DIRTY                 BIT_ULL(55)
> -#define PM_MMAP_EXCLUSIVE             BIT_ULL(56)
> -#define PM_UFFD_WP                    BIT_ULL(57)
> -#define PM_FILE                       BIT_ULL(61)
> -#define PM_SWAP                       BIT_ULL(62)
> -#define PM_PRESENT                    BIT_ULL(63)
> -
>  static int pagemap_open(void)
>  {
>  	int fd = open("/proc/self/pagemap", O_RDONLY);
> diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c
> index 12dc654b5be3..8e9da621764a 100644
> --- a/tools/testing/selftests/mm/vm_util.c
> +++ b/tools/testing/selftests/mm/vm_util.c
> @@ -25,25 +25,17 @@ uint64_t pagemap_get_entry(int fd, char *start)
> 
>  bool pagemap_is_softdirty(int fd, char *start)
>  {
> -	uint64_t entry = pagemap_get_entry(fd, start);
> -
> -	// Check if dirty bit (55th bit) is set
> -	return entry & 0x0080000000000000ull;
> +	return pagemap_get_entry(fd, start) & PM_SOFT_DIRTY;
>  }
> 
>  bool pagemap_is_swapped(int fd, char *start)
>  {
> -	uint64_t entry = pagemap_get_entry(fd, start);
> -
> -	return entry & 0x4000000000000000ull;
> +	return pagemap_get_entry(fd, start) & PM_SWAP;
>  }
> 
>  bool pagemap_is_populated(int fd, char *start)
>  {
> -	uint64_t entry = pagemap_get_entry(fd, start);
> -
> -	/* Present or swapped. */
> -	return entry & 0xc000000000000000ull;
> +	return pagemap_get_entry(fd, start) & (PM_PRESENT | PM_SWAP);
>  }
> 
>  unsigned long pagemap_get_pfn(int fd, char *start)
> @@ -51,7 +43,7 @@ unsigned long pagemap_get_pfn(int fd, char *start)
>  	uint64_t entry = pagemap_get_entry(fd, start);
> 
>  	/* If present (63th bit), PFN is at bit 0 -- 54. */
> -	if (entry & 0x8000000000000000ull)
> +	if (entry & PM_PRESENT)
>  		return entry & 0x007fffffffffffffull;
>  	return -1ul;
>  }
> diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h
> index d7163fff8fb7..d9fadddb5c69 100644
> --- a/tools/testing/selftests/mm/vm_util.h
> +++ b/tools/testing/selftests/mm/vm_util.h
> @@ -6,6 +6,14 @@
>  #include <string.h> /* ffsl() */
>  #include <unistd.h> /* _SC_PAGESIZE */
> 
> +#define BIT_ULL(nr)                   (1ULL << (nr))
> +#define PM_SOFT_DIRTY                 BIT_ULL(55)
> +#define PM_MMAP_EXCLUSIVE             BIT_ULL(56)
> +#define PM_UFFD_WP                    BIT_ULL(57)
> +#define PM_FILE                       BIT_ULL(61)
> +#define PM_SWAP                       BIT_ULL(62)
> +#define PM_PRESENT                    BIT_ULL(63)
> +
>  extern unsigned int __page_size;
>  extern unsigned int __page_shift;
> 
> -- 
> 2.39.1
> 

-- 
Sincerely yours,
Mike.