Re: [RFC PATCH v2 3/3] mm: make generic pXd_addr_end() macros inline functions
From: Mike Rapoport <rppt@kernel.org>
Date: 2020-09-07 20:16:09
Also in:
linux-arch, linux-arm-kernel, linux-mm, linux-s390, linux-um, lkml, sparclinux
Hi, Some style comments below. On Mon, Sep 07, 2020 at 08:00:58PM +0200, Gerald Schaefer wrote:
quoted hunk ↗ jump to hunk
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.