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Date: Tue, 29 Jul 2008 00:53:31 +0200
From: Andrea Righi <righi.andrea@...il.com>
To: Jeremy Fitzhardinge <jeremy@...p.org>
CC: Andrew Morton <akpm@...ux-foundation.org>,
kosaki.motohiro@...fujitsu.com, torvalds@...ux-foundation.org,
linux-mm@...ck.org, linux-arch@...r.kernel.org,
linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/1] mm: unify pmd_free() and __pmd_free_tlb() implementation
Jeremy Fitzhardinge wrote:
> Andrew Morton wrote:
>> I can second that. See
>> http://userweb.kernel.org/~akpm/mmotm/broken-out/include-asm-generic-pgtable-nopmdh-macros-are-noxious-reason-435.patch
>>
>> Ingo cruelly ignored it. Probably he's used to ignoring the comit
>> storm which I send in his direction - I'll need to resend it sometime.
>>
>> I'd consider that patch to be partial - we should demacroize the
>> surrounding similar functions too. But that will require a bit more
>> testing.
>
> Its immediate neighbours should be easy enough (pmd_alloc_one,
> __pmd_free_tlb), but any of the ones involving pmd_t risk #include hell
> (though the earlier references to pud_t in inline functions suggest it
> will work). And pmd_addr_end is just ugly.
>
> J
>
ok, let's start with the easiest: pmd_free() and __pmd_free_tlb().
Following another attempt to unify the implementations using inline
functions. It seems to build fine on x86 (pae / non-pae) and on x86_64.
This is an RFC patch right now, not for inclusion (just asking if it
could be a reasonable approach or not). And in any case this would need
more testing.
Signed-off-by: Andrea Righi <righi.andrea@...il.com>
---
arch/sparc/include/asm/pgalloc_64.h | 1 +
include/asm-alpha/pgalloc.h | 1 +
include/asm-arm/pgalloc.h | 1 -
include/asm-frv/pgalloc.h | 2 --
include/asm-generic/pgtable-nopmd.h | 19 +++++++++++++++++--
include/asm-ia64/pgalloc.h | 1 +
include/asm-m32r/pgalloc.h | 2 --
include/asm-m68k/motorola_pgalloc.h | 3 ++-
include/asm-m68k/sun3_pgalloc.h | 7 -------
include/asm-mips/pgalloc.h | 12 +-----------
include/asm-parisc/pgalloc.h | 2 +-
include/asm-powerpc/pgalloc-32.h | 2 --
include/asm-powerpc/pgalloc-64.h | 1 +
include/asm-s390/pgalloc.h | 1 -
include/asm-sh/pgalloc.h | 8 --------
include/asm-um/pgalloc.h | 1 +
include/asm-x86/pgalloc.h | 2 ++
17 files changed, 28 insertions(+), 38 deletions(-)
diff --git a/arch/sparc/include/asm/pgalloc_64.h b/arch/sparc/include/asm/pgalloc_64.h
index 5bdfa2c..17cf9f5 100644
--- a/arch/sparc/include/asm/pgalloc_64.h
+++ b/arch/sparc/include/asm/pgalloc_64.h
@@ -35,6 +35,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
quicklist_free(0, NULL, pmd);
}
+#define pmd_free pmd_free
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
diff --git a/include/asm-alpha/pgalloc.h b/include/asm-alpha/pgalloc.h
index fd09015..ba68ca2 100644
--- a/include/asm-alpha/pgalloc.h
+++ b/include/asm-alpha/pgalloc.h
@@ -49,6 +49,7 @@ pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
free_page((unsigned long)pmd);
}
+#define pmd_free pmd_free
extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
diff --git a/include/asm-arm/pgalloc.h b/include/asm-arm/pgalloc.h
index 163b030..c1da401 100644
--- a/include/asm-arm/pgalloc.h
+++ b/include/asm-arm/pgalloc.h
@@ -27,7 +27,6 @@
* Since we have only two-level page tables, these are trivial
*/
#define pmd_alloc_one(mm,addr) ({ BUG(); ((pmd_t *)2); })
-#define pmd_free(mm, pmd) do { } while (0)
#define pgd_populate(mm,pmd,pte) BUG()
extern pgd_t *get_pgd_slow(struct mm_struct *mm);
diff --git a/include/asm-frv/pgalloc.h b/include/asm-frv/pgalloc.h
index 971e6ad..790b9ff 100644
--- a/include/asm-frv/pgalloc.h
+++ b/include/asm-frv/pgalloc.h
@@ -61,8 +61,6 @@ do { \
* (In the PAE case we free the pmds as part of the pgd.)
*/
#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *) 2); })
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb,x) do { } while (0)
#endif /* CONFIG_MMU */
diff --git a/include/asm-generic/pgtable-nopmd.h b/include/asm-generic/pgtable-nopmd.h
index 087325e..7bf330e 100644
--- a/include/asm-generic/pgtable-nopmd.h
+++ b/include/asm-generic/pgtable-nopmd.h
@@ -5,6 +5,9 @@
#include <asm-generic/pgtable-nopud.h>
+struct mm_struct;
+struct mmu_gather;
+
#define __PAGETABLE_PMD_FOLDED
/*
@@ -54,8 +57,20 @@ static inline pmd_t * pmd_offset(pud_t * pud, unsigned long address)
* inside the pud, so has no extra memory associated with it.
*/
#define pmd_alloc_one(mm, address) NULL
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb, x) do { } while (0)
+
+#ifndef pmd_free
+static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
+{
+}
+#define pmd_free pmd_free
+#endif
+
+#ifndef __pmd_free_tlb
+static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
+{
+}
+#define __pmd_free_tlb __pmd_free_tlb
+#endif
#undef pmd_addr_end
#define pmd_addr_end(addr, end) (end)
diff --git a/include/asm-ia64/pgalloc.h b/include/asm-ia64/pgalloc.h
index b9ac1a6..6c9575c 100644
--- a/include/asm-ia64/pgalloc.h
+++ b/include/asm-ia64/pgalloc.h
@@ -66,6 +66,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
quicklist_free(0, NULL, pmd);
}
+#define pmd_free pmd_free
#define __pmd_free_tlb(tlb, pmd) pmd_free((tlb)->mm, pmd)
diff --git a/include/asm-m32r/pgalloc.h b/include/asm-m32r/pgalloc.h
index f11a2b9..f7ecc72 100644
--- a/include/asm-m32r/pgalloc.h
+++ b/include/asm-m32r/pgalloc.h
@@ -67,8 +67,6 @@ static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
*/
#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb, x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
#define check_pgt_cache() do { } while (0)
diff --git a/include/asm-m68k/motorola_pgalloc.h b/include/asm-m68k/motorola_pgalloc.h
index d08bf62..1dc96c7 100644
--- a/include/asm-m68k/motorola_pgalloc.h
+++ b/include/asm-m68k/motorola_pgalloc.h
@@ -72,12 +72,13 @@ static inline int pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
return free_pointer_table(pmd);
}
+#define pmd_free pmd_free
static inline int __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd)
{
return free_pointer_table(pmd);
}
-
+#define __pmd_free_tlb __pmd_free_tlb
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
diff --git a/include/asm-m68k/sun3_pgalloc.h b/include/asm-m68k/sun3_pgalloc.h
index d4c83f1..795e3c0 100644
--- a/include/asm-m68k/sun3_pgalloc.h
+++ b/include/asm-m68k/sun3_pgalloc.h
@@ -75,13 +75,6 @@ static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t page
}
#define pmd_pgtable(pmd) pmd_page(pmd)
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb, x) do { } while (0)
-
static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
free_page((unsigned long) pgd);
diff --git a/include/asm-mips/pgalloc.h b/include/asm-mips/pgalloc.h
index 1275831..79a4182 100644
--- a/include/asm-mips/pgalloc.h
+++ b/include/asm-mips/pgalloc.h
@@ -104,17 +104,6 @@ do { \
tlb_remove_page((tlb), pte); \
} while (0)
-#ifdef CONFIG_32BIT
-
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb, x) do { } while (0)
-
-#endif
-
#ifdef CONFIG_64BIT
static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
@@ -131,6 +120,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
free_pages((unsigned long)pmd, PMD_ORDER);
}
+#define pmd_free pmd_free
#define __pmd_free_tlb(tlb, x) pmd_free((tlb)->mm, x)
diff --git a/include/asm-parisc/pgalloc.h b/include/asm-parisc/pgalloc.h
index fc987a1..632b2c5 100644
--- a/include/asm-parisc/pgalloc.h
+++ b/include/asm-parisc/pgalloc.h
@@ -80,6 +80,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
#endif
free_pages((unsigned long)pmd, PMD_ORDER);
}
+#define pmd_free pmd_free
#else
@@ -91,7 +92,6 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
*/
#define pmd_alloc_one(mm, addr) ({ BUG(); ((pmd_t *)2); })
-#define pmd_free(mm, x) do { } while (0)
#define pgd_populate(mm, pmd, pte) BUG()
#endif
diff --git a/include/asm-powerpc/pgalloc-32.h b/include/asm-powerpc/pgalloc-32.h
index 58c0714..dc6dca5 100644
--- a/include/asm-powerpc/pgalloc-32.h
+++ b/include/asm-powerpc/pgalloc-32.h
@@ -13,8 +13,6 @@ extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
* the pgd will always be present..
*/
/* #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) */
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb,x) do { } while (0)
/* #define pgd_populate(mm, pmd, pte) BUG() */
#ifndef CONFIG_BOOKE
diff --git a/include/asm-powerpc/pgalloc-64.h b/include/asm-powerpc/pgalloc-64.h
index 812a1d8..0b63bc4 100644
--- a/include/asm-powerpc/pgalloc-64.h
+++ b/include/asm-powerpc/pgalloc-64.h
@@ -87,6 +87,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
}
+#define pmd_free pmd_free
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
unsigned long address)
diff --git a/include/asm-s390/pgalloc.h b/include/asm-s390/pgalloc.h
index f5b2bf3..67b4758 100644
--- a/include/asm-s390/pgalloc.h
+++ b/include/asm-s390/pgalloc.h
@@ -61,7 +61,6 @@ static inline unsigned long pgd_entry_type(struct mm_struct *mm)
#define pud_free(mm, x) do { } while (0)
#define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); })
-#define pmd_free(mm, x) do { } while (0)
#define pgd_populate(mm, pgd, pud) BUG()
#define pgd_populate_kernel(mm, pgd, pud) BUG()
diff --git a/include/asm-sh/pgalloc.h b/include/asm-sh/pgalloc.h
index 84dd2db..f9d9ccb 100644
--- a/include/asm-sh/pgalloc.h
+++ b/include/asm-sh/pgalloc.h
@@ -79,14 +79,6 @@ do { \
tlb_remove_page((tlb), (pte)); \
} while (0)
-/*
- * allocating and freeing a pmd is trivial: the 1-entry pmd is
- * inside the pgd, so has no extra memory associated with it.
- */
-
-#define pmd_free(mm, x) do { } while (0)
-#define __pmd_free_tlb(tlb,x) do { } while (0)
-
static inline void check_pgt_cache(void)
{
quicklist_trim(QUICK_PGD, NULL, 25, 16);
diff --git a/include/asm-um/pgalloc.h b/include/asm-um/pgalloc.h
index 9062a6e..264120b 100644
--- a/include/asm-um/pgalloc.h
+++ b/include/asm-um/pgalloc.h
@@ -52,6 +52,7 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
free_page((unsigned long)pmd);
}
+#define pmd_free pmd_free
#define __pmd_free_tlb(tlb,x) tlb_remove_page((tlb),virt_to_page(x))
#endif
diff --git a/include/asm-x86/pgalloc.h b/include/asm-x86/pgalloc.h
index d63ea43..3c46c59 100644
--- a/include/asm-x86/pgalloc.h
+++ b/include/asm-x86/pgalloc.h
@@ -76,8 +76,10 @@ static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
free_page((unsigned long)pmd);
}
+#define pmd_free pmd_free
extern void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd);
+#define __pmd_free_tlb __pmd_free_tlb
#ifdef CONFIG_X86_PAE
extern void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd);
--
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