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    SubjectRe: [RFC PATCH v2 3/3] mm: make generic pXd_addr_end() macros inline functions
    Hi,

    Some style comments below.

    On Mon, Sep 07, 2020 at 08:00:58PM +0200, Gerald Schaefer wrote:
    > From: Alexander Gordeev <agordeev@linux.ibm.com>
    >
    > Since pXd_addr_end() macros take pXd page-table entry as a
    > parameter it makes sense to check the entry type on compile.
    > Even though most archs do not make use of page-table entries
    > in pXd_addr_end() calls, checking the type in traversal code
    > paths could help to avoid subtle bugs.
    >
    > Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
    > Signed-off-by: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
    > ---
    > include/linux/pgtable.h | 36 ++++++++++++++++++++----------------
    > 1 file changed, 20 insertions(+), 16 deletions(-)
    >
    > diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
    > index 67ebc22cf83d..d9e7d16c2263 100644
    > --- a/include/linux/pgtable.h
    > +++ b/include/linux/pgtable.h
    > @@ -656,31 +656,35 @@ static inline int arch_unmap_one(struct mm_struct *mm,
    > */
    >
    > #ifndef pgd_addr_end
    > -#define pgd_addr_end(pgd, addr, end) \
    > -({ unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK; \
    > - (__boundary - 1 < (end) - 1)? __boundary: (end); \
    > -})
    > +#define pgd_addr_end pgd_addr_end
    > +static inline unsigned long pgd_addr_end(pgd_t pgd, unsigned long addr, unsigned long end)
    > +{ unsigned long __boundary = (addr + PGDIR_SIZE) & PGDIR_MASK;

    The code should be on a separate line from the curly brace.
    Besides, since this is not a macro anymore, I think it would be nicer to
    use 'boundary' without underscores.
    This applies to the changes below as well.

    > + return (__boundary - 1 < end - 1) ? __boundary : end;
    > +}
    > #endif
    >
    > #ifndef p4d_addr_end
    > -#define p4d_addr_end(p4d, addr, end) \
    > -({ unsigned long __boundary = ((addr) + P4D_SIZE) & P4D_MASK; \
    > - (__boundary - 1 < (end) - 1)? __boundary: (end); \
    > -})
    > +#define p4d_addr_end p4d_addr_end
    > +static inline unsigned long p4d_addr_end(p4d_t p4d, unsigned long addr, unsigned long end)
    > +{ unsigned long __boundary = (addr + P4D_SIZE) & P4D_MASK;
    > + return (__boundary - 1 < end - 1) ? __boundary : end;
    > +}
    > #endif
    >
    > #ifndef pud_addr_end
    > -#define pud_addr_end(pud, addr, end) \
    > -({ unsigned long __boundary = ((addr) + PUD_SIZE) & PUD_MASK; \
    > - (__boundary - 1 < (end) - 1)? __boundary: (end); \
    > -})
    > +#define pud_addr_end pud_addr_end
    > +static inline unsigned long pud_addr_end(pud_t pud, unsigned long addr, unsigned long end)
    > +{ unsigned long __boundary = (addr + PUD_SIZE) & PUD_MASK;
    > + return (__boundary - 1 < end - 1) ? __boundary : end;
    > +}
    > #endif
    >
    > #ifndef pmd_addr_end
    > -#define pmd_addr_end(pmd, addr, end) \
    > -({ unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK; \
    > - (__boundary - 1 < (end) - 1)? __boundary: (end); \
    > -})
    > +#define pmd_addr_end pmd_addr_end
    > +static inline unsigned long pmd_addr_end(pmd_t pmd, unsigned long addr, unsigned long end)
    > +{ unsigned long __boundary = (addr + PMD_SIZE) & PMD_MASK;
    > + return (__boundary - 1 < end - 1) ? __boundary : end;
    > +}
    > #endif
    >
    > /*
    > --
    > 2.17.1
    >

    --
    Sincerely yours,
    Mike.

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