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From:   "Huang, Ying" <ying.huang@intel.com>
To:     Peter Xu <peterx@redhat.com>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Minchan Kim <minchan@kernel.org>,
        David Hildenbrand <david@redhat.com>,
        Nadav Amit <nadav.amit@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Hugh Dickins <hughd@google.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Andi Kleen <andi.kleen@intel.com>,
        "Kirill A . Shutemov" <kirill@shutemov.name>
Subject: Re: [PATCH v3 1/7] mm/x86: Use SWP_TYPE_BITS in 3-level swap macros
References: <20220809220100.20033-1-peterx@redhat.com>
        <20220809220100.20033-2-peterx@redhat.com>
Date:   Wed, 10 Aug 2022 09:13:44 +0800
In-Reply-To: <20220809220100.20033-2-peterx@redhat.com> (Peter Xu's message of
        "Tue, 9 Aug 2022 18:00:54 -0400")
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Peter Xu <peterx@redhat.com> writes:

> Replace all the magic "5" with the macro.
>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> Signed-off-by: Peter Xu <peterx@redhat.com>

Reviewed-by: "Huang, Ying" <ying.huang@intel.com>

Best Regards,
Huang, Ying

> ---
>  arch/x86/include/asm/pgtable-3level.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h
> index e896ebef8c24..28421a887209 100644
> --- a/arch/x86/include/asm/pgtable-3level.h
> +++ b/arch/x86/include/asm/pgtable-3level.h
> @@ -256,10 +256,10 @@ static inline pud_t native_pudp_get_and_clear(pud_t *pudp)
>  /* We always extract/encode the offset by shifting it all the way up, and then down again */
>  #define SWP_OFFSET_SHIFT	(SWP_OFFSET_FIRST_BIT + SWP_TYPE_BITS)
>  
> -#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5)
> -#define __swp_type(x)			(((x).val) & 0x1f)
> -#define __swp_offset(x)			((x).val >> 5)
> -#define __swp_entry(type, offset)	((swp_entry_t){(type) | (offset) << 5})
> +#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
> +#define __swp_type(x)			(((x).val) & ((1UL << SWP_TYPE_BITS) - 1))
> +#define __swp_offset(x)			((x).val >> SWP_TYPE_BITS)
> +#define __swp_entry(type, offset)	((swp_entry_t){(type) | (offset) << SWP_TYPE_BITS})
>  
>  /*
>   * Normally, __swp_entry() converts from arch-independent swp_entry_t to