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Date: Thu, 21 May 2015 12:31:31 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
kirill.shutemov@...ux.intel.com, aarcange@...hat.com,
schwidefsky@...ibm.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH V5 2/3] powerpc/mm: Use generic version of pmdp_clear_flush
Andrew Morton <akpm@...ux-foundation.org> writes:
> On Fri, 15 May 2015 21:12:29 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
>
>> Also move the pmd_trans_huge check to generic code.
>>
>> ...
>>
>> --- a/include/asm-generic/pgtable.h
>> +++ b/include/asm-generic/pgtable.h
>> @@ -196,7 +196,12 @@ static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
>> unsigned long address,
>> pmd_t *pmdp)
>> {
>> - return pmdp_clear_flush(vma, address, pmdp);
>> + pmd_t pmd;
>> + VM_BUG_ON(address & ~HPAGE_PMD_MASK);
>> + VM_BUG_ON(pmd_trans_huge(*pmdp));
>> + pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
>> + flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
>> + return pmd;
>> }
>
> x86_64 allmodconfig:
>
> In file included from ./arch/x86/include/asm/pgtable.h:878,
> from include/linux/mm.h:53,
> from include/linux/suspend.h:8,
> from arch/x86/kernel/asm-offsets.c:12:
> include/asm-generic/pgtable.h: In function 'pmdp_collapse_flush':
> include/asm-generic/pgtable.h:199: error: 'HPAGE_PMD_MASK' undeclared (first use in this function)
> include/asm-generic/pgtable.h:199: error: (Each undeclared identifier is reported only once
> include/asm-generic/pgtable.h:199: error: for each function it appears in.)
> include/asm-generic/pgtable.h:202: error: implicit declaration of function 'flush_tlb_range'
> include/asm-generic/pgtable.h:202: error: 'HPAGE_PMD_SIZE' undeclared (first use in this function)
>
Sorry for the build break. I was mostly focusing on the ppc64 build with
different platforms and was hoping that will include all thp/enable
disable configs. Unfortunately, we needed a config that is thp enabled and
use generic pgtable.h. Will make sure that I test build and boot test on
x86 before sending patch next time.
>
> Including linux/huge_mm.h doesn't work. A suitable fix would be to
> move this into a .c file.
that helped.
commit 3ef98ff8092789f7b58f3662297a80eff8d757ea
Author: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Date: Mon May 11 15:53:21 2015 +0530
powerpc/mm: Use generic version of pmdp_clear_flush
Also move the pmd_trans_huge check to generic code.
Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h
index 129c67ebc81a..55f06a381dd7 100644
--- a/arch/powerpc/include/asm/pgtable-ppc64.h
+++ b/arch/powerpc/include/asm/pgtable-ppc64.h
@@ -557,10 +557,6 @@ extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
extern pmd_t pmdp_get_and_clear(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp);
-#define __HAVE_ARCH_PMDP_CLEAR_FLUSH
-extern pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
- pmd_t *pmdp);
-
#define __HAVE_ARCH_PMDP_SET_WRPROTECT
static inline void pmdp_set_wrprotect(struct mm_struct *mm, unsigned long addr,
pmd_t *pmdp)
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 9171c1a37290..d37b9d1a1813 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -554,17 +554,6 @@ unsigned long pmd_hugepage_update(struct mm_struct *mm, unsigned long addr,
return old;
}
-pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
- pmd_t *pmdp)
-{
- pmd_t pmd;
-
- VM_BUG_ON(address & ~HPAGE_PMD_MASK);
- VM_BUG_ON(!pmd_trans_huge(*pmdp));
- pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
- return pmd;
-}
-
pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index fc642399b489..17627f73a032 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1548,6 +1548,14 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
}
}
+static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
+ unsigned long address,
+ pmd_t *pmdp)
+{
+ return pmdp_get_and_clear(vma->vm_mm, address, pmdp);
+}
+#define pmdp_collapse_flush pmdp_collapse_flush
+
#define pfn_pmd(pfn, pgprot) mk_pmd_phys(__pa((pfn) << PAGE_SHIFT), (pgprot))
#define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 2c3ca89e9aee..3b5a89ab4103 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -191,13 +191,8 @@ extern void pmdp_splitting_flush(struct vm_area_struct *vma,
#ifndef pmdp_collapse_flush
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
-static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
- unsigned long address,
- pmd_t *pmdp)
-{
- return pmdp_clear_flush(vma, address, pmdp);
-}
-#define pmdp_collapse_flush pmdp_collapse_flush
+extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp);
#else
static inline pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
unsigned long address,
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index c25f94b33811..7f2314f9e16f 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -126,6 +126,7 @@ pmd_t pmdp_clear_flush(struct vm_area_struct *vma, unsigned long address,
{
pmd_t pmd;
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ VM_BUG_ON(!pmd_trans_huge(*pmdp));
pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
return pmd;
@@ -198,3 +199,18 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
+
+#ifndef pmdp_collapse_flush
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
+ pmd_t *pmdp)
+{
+ pmd_t pmd;
+ VM_BUG_ON(address & ~HPAGE_PMD_MASK);
+ VM_BUG_ON(pmd_trans_huge(*pmdp));
+ pmd = pmdp_get_and_clear(vma->vm_mm, address, pmdp);
+ flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
+ return pmd;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+#endif
--
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