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

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Le 07/09/2020 à 20:00, Gerald Schaefer a écrit :
From: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>

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@xxxxxxxxxxxxx>
Signed-off-by: Gerald Schaefer <gerald.schaefer@xxxxxxxxxxxxx>
---
  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

I think that #define is pointless, usually there is no such #define for the default case.

+static inline unsigned long pgd_addr_end(pgd_t pgd, unsigned long addr, unsigned long end)
+{	unsigned long __boundary = (addr + PGDIR_SIZE) & PGDIR_MASK;
+	return (__boundary - 1 < end - 1) ? __boundary : end;
+}

Please use the standard layout, ie entry { and exit } alone on their line, and space between local vars declaration and the rest.

Also remove the leading __ in front of var names as it's not needed once it is not macros anymore.

f_name()
{
	some_local_var;

	do_something();
}

  #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
/*






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