* [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code
@ 2015-10-09 11:43 Vineet Gupta
2015-10-09 13:04 ` Vineet Gupta
0 siblings, 1 reply; 4+ messages in thread
From: Vineet Gupta @ 2015-10-09 11:43 UTC (permalink / raw)
To: Andrew Morton, Kirill A. Shutemov; +Cc: linux-kernel, linux-mm, Vineet Gupta
- pgtable-generic.c: Fold individual #ifdef for each helper into a top
level #ifdef. Makes code more readable
- Converted the stub helpers for !THP to BUILD_BUG() vs. runtime BUG()
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
Somehow the msg didn't make it to mailing list !
---
include/asm-generic/pgtable.h | 37 ++++++++++++++++++++++++++++++-------
mm/pgtable-generic.c | 24 +++---------------------
2 files changed, 33 insertions(+), 28 deletions(-)
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 29c57b2cb344..3eabbbbfd578 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -30,9 +30,19 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma,
#endif
#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern int pmdp_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp,
pmd_t entry, int dirty);
+#else
+static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp,
+ pmd_t entry, int dirty)
+{
+ BUILD_BUG();
+ return 0;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
@@ -64,12 +74,12 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
return r;
}
-#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#else
static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
unsigned long address,
pmd_t *pmdp)
{
- BUG();
+ BUILD_BUG();
return 0;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
@@ -81,8 +91,21 @@ int ptep_clear_flush_young(struct vm_area_struct *vma,
#endif
#ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
-int pmdp_clear_flush_young(struct vm_area_struct *vma,
- unsigned long address, pmd_t *pmdp);
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp);
+#else
+/*
+ * Despite relevant to THP only, this API is called from generic rmap code
+ * under PageTransHuge(), hence needs a dummy implementation for !THP
+ */
+static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
+ unsigned long address, pmd_t *pmdp)
+{
+ BUILD_BUG();
+ return 0;
+}
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
@@ -175,11 +198,11 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
pmd_t old_pmd = *pmdp;
set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
}
-#else /* CONFIG_TRANSPARENT_HUGEPAGE */
+#else
static inline void pmdp_set_wrprotect(struct mm_struct *mm,
unsigned long address, pmd_t *pmdp)
{
- BUG();
+ BUILD_BUG();
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
@@ -248,7 +271,7 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
#else /* CONFIG_TRANSPARENT_HUGEPAGE */
static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
{
- BUG();
+ BUILD_BUG();
return 0;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
index 48851894e699..c9c59bb75a17 100644
--- a/mm/pgtable-generic.c
+++ b/mm/pgtable-generic.c
@@ -82,12 +82,13 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
}
#endif
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+
#ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
int pmdp_set_access_flags(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp,
pmd_t entry, int dirty)
{
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
int changed = !pmd_same(*pmdp, entry);
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
if (changed) {
@@ -95,10 +96,6 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}
return changed;
-#else /* CONFIG_TRANSPARENT_HUGEPAGE */
- BUG();
- return 0;
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
}
#endif
@@ -107,11 +104,7 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp)
{
int young;
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
VM_BUG_ON(address & ~HPAGE_PMD_MASK);
-#else
- BUG();
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
young = pmdp_test_and_clear_young(vma, address, pmdp);
if (young)
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
@@ -120,7 +113,6 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
#endif
#ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
@@ -131,11 +123,9 @@ pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
return pmd;
}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
@@ -145,11 +135,9 @@ void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
/* tlb flush only to serialize against gup-fast */
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable)
{
@@ -162,11 +150,9 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
pmd_huge_pte(mm, pmdp) = pgtable;
}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/* no "address" argument so destroys page coloring of some arch */
pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
{
@@ -185,11 +171,9 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
}
return pgtable;
}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
#ifndef __HAVE_ARCH_PMDP_INVALIDATE
-#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
pmd_t *pmdp)
{
@@ -197,11 +181,9 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
}
-#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)
{
@@ -217,5 +199,5 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
return pmd;
}
-#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
#endif
+#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
--
1.9.1
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^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code
2015-10-09 11:43 [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code Vineet Gupta
@ 2015-10-09 13:04 ` Vineet Gupta
2015-10-09 13:34 ` Kirill A. Shutemov
0 siblings, 1 reply; 4+ messages in thread
From: Vineet Gupta @ 2015-10-09 13:04 UTC (permalink / raw)
To: Andrew Morton, Kirill A. Shutemov; +Cc: linux-kernel, linux-mm
On Friday 09 October 2015 05:13 PM, Vineet Gupta wrote:
> - pgtable-generic.c: Fold individual #ifdef for each helper into a top
> level #ifdef. Makes code more readable
>
> - Converted the stub helpers for !THP to BUILD_BUG() vs. runtime BUG()
>
> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Sorry for sounding pushy - an Ack here will unblock me from dumping boat load of
patches into linux-next via my tree !
Thx,
-Vineet
> ---
> Somehow the msg didn't make it to mailing list !
> ---
> include/asm-generic/pgtable.h | 37 ++++++++++++++++++++++++++++++-------
> mm/pgtable-generic.c | 24 +++---------------------
> 2 files changed, 33 insertions(+), 28 deletions(-)
>
> diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
> index 29c57b2cb344..3eabbbbfd578 100644
> --- a/include/asm-generic/pgtable.h
> +++ b/include/asm-generic/pgtable.h
> @@ -30,9 +30,19 @@ extern int ptep_set_access_flags(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> extern int pmdp_set_access_flags(struct vm_area_struct *vma,
> unsigned long address, pmd_t *pmdp,
> pmd_t entry, int dirty);
> +#else
> +static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
> + unsigned long address, pmd_t *pmdp,
> + pmd_t entry, int dirty)
> +{
> + BUILD_BUG();
> + return 0;
> +}
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
> @@ -64,12 +74,12 @@ static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
> set_pmd_at(vma->vm_mm, address, pmdp, pmd_mkold(pmd));
> return r;
> }
> -#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> +#else
> static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
> unsigned long address,
> pmd_t *pmdp)
> {
> - BUG();
> + BUILD_BUG();
> return 0;
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> @@ -81,8 +91,21 @@ int ptep_clear_flush_young(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
> -int pmdp_clear_flush_young(struct vm_area_struct *vma,
> - unsigned long address, pmd_t *pmdp);
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
> + unsigned long address, pmd_t *pmdp);
> +#else
> +/*
> + * Despite relevant to THP only, this API is called from generic rmap code
> + * under PageTransHuge(), hence needs a dummy implementation for !THP
> + */
> +static inline int pmdp_clear_flush_young(struct vm_area_struct *vma,
> + unsigned long address, pmd_t *pmdp)
> +{
> + BUILD_BUG();
> + return 0;
> +}
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PTEP_GET_AND_CLEAR
> @@ -175,11 +198,11 @@ static inline void pmdp_set_wrprotect(struct mm_struct *mm,
> pmd_t old_pmd = *pmdp;
> set_pmd_at(mm, address, pmdp, pmd_wrprotect(old_pmd));
> }
> -#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> +#else
> static inline void pmdp_set_wrprotect(struct mm_struct *mm,
> unsigned long address, pmd_t *pmdp)
> {
> - BUG();
> + BUILD_BUG();
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
> @@ -248,7 +271,7 @@ static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
> #else /* CONFIG_TRANSPARENT_HUGEPAGE */
> static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)
> {
> - BUG();
> + BUILD_BUG();
> return 0;
> }
> #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c
> index 48851894e699..c9c59bb75a17 100644
> --- a/mm/pgtable-generic.c
> +++ b/mm/pgtable-generic.c
> @@ -82,12 +82,13 @@ pte_t ptep_clear_flush(struct vm_area_struct *vma, unsigned long address,
> }
> #endif
>
> +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> +
> #ifndef __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
> int pmdp_set_access_flags(struct vm_area_struct *vma,
> unsigned long address, pmd_t *pmdp,
> pmd_t entry, int dirty)
> {
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> int changed = !pmd_same(*pmdp, entry);
> VM_BUG_ON(address & ~HPAGE_PMD_MASK);
> if (changed) {
> @@ -95,10 +96,6 @@ int pmdp_set_access_flags(struct vm_area_struct *vma,
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> }
> return changed;
> -#else /* CONFIG_TRANSPARENT_HUGEPAGE */
> - BUG();
> - return 0;
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> }
> #endif
>
> @@ -107,11 +104,7 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
> unsigned long address, pmd_t *pmdp)
> {
> int young;
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> VM_BUG_ON(address & ~HPAGE_PMD_MASK);
> -#else
> - BUG();
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> young = pmdp_test_and_clear_young(vma, address, pmdp);
> if (young)
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> @@ -120,7 +113,6 @@ int pmdp_clear_flush_young(struct vm_area_struct *vma,
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_HUGE_CLEAR_FLUSH
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -131,11 +123,9 @@ pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma, unsigned long address,
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> return pmd;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_SPLITTING_FLUSH
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -145,11 +135,9 @@ void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
> /* tlb flush only to serialize against gup-fast */
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PGTABLE_DEPOSIT
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
> pgtable_t pgtable)
> {
> @@ -162,11 +150,9 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
> list_add(&pgtable->lru, &pmd_huge_pte(mm, pmdp)->lru);
> pmd_huge_pte(mm, pmdp) = pgtable;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PGTABLE_WITHDRAW
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> /* no "address" argument so destroys page coloring of some arch */
> pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
> {
> @@ -185,11 +171,9 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp)
> }
> return pgtable;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
>
> #ifndef __HAVE_ARCH_PMDP_INVALIDATE
> -#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
> pmd_t *pmdp)
> {
> @@ -197,11 +181,9 @@ void pmdp_invalidate(struct vm_area_struct *vma, unsigned long address,
> set_pmd_at(vma->vm_mm, address, pmdp, pmd_mknotpresent(entry));
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> }
> -#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)
> {
> @@ -217,5 +199,5 @@ pmd_t pmdp_collapse_flush(struct vm_area_struct *vma, unsigned long address,
> flush_tlb_range(vma, address, address + HPAGE_PMD_SIZE);
> return pmd;
> }
> -#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> #endif
> +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
>
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code
2015-10-09 13:04 ` Vineet Gupta
@ 2015-10-09 13:34 ` Kirill A. Shutemov
2015-10-09 13:39 ` Vineet Gupta
0 siblings, 1 reply; 4+ messages in thread
From: Kirill A. Shutemov @ 2015-10-09 13:34 UTC (permalink / raw)
To: Vineet Gupta; +Cc: Andrew Morton, Kirill A. Shutemov, linux-kernel, linux-mm
On Fri, Oct 09, 2015 at 06:34:10PM +0530, Vineet Gupta wrote:
> On Friday 09 October 2015 05:13 PM, Vineet Gupta wrote:
> > - pgtable-generic.c: Fold individual #ifdef for each helper into a top
> > level #ifdef. Makes code more readable
> >
> > - Converted the stub helpers for !THP to BUILD_BUG() vs. runtime BUG()
> >
> > Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
>
> Sorry for sounding pushy - an Ack here will unblock me from dumping boat load of
> patches into linux-next via my tree !
I hope you've tested it with different .configs...
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
--
Kirill A. Shutemov
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code
2015-10-09 13:34 ` Kirill A. Shutemov
@ 2015-10-09 13:39 ` Vineet Gupta
0 siblings, 0 replies; 4+ messages in thread
From: Vineet Gupta @ 2015-10-09 13:39 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Andrew Morton, Kirill A. Shutemov, linux-kernel, linux-mm
On Friday 09 October 2015 07:04 PM, Kirill A. Shutemov wrote:
On Fri, Oct 09, 2015 at 06:34:10PM +0530, Vineet Gupta wrote:
> On Friday 09 October 2015 05:13 PM, Vineet Gupta wrote:
> > - pgtable-generic.c: Fold individual #ifdef for each helper into a top
> > level #ifdef. Makes code more readable
> >
> > - Converted the stub helpers for !THP to BUILD_BUG() vs. runtime BUG()
> >
> > Signed-off-by: Vineet Gupta <vgupta@synopsys.com><mailto:vgupta@synopsys.com>
>
> Sorry for sounding pushy - an Ack here will unblock me from dumping boat load of
> patches into linux-next via my tree !
I hope you've tested it with different .configs...
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com><mailto:kirill.shutemov@linux.intel.com>
Atleast 2 configs with CONFIG_TRANSPARENT_HUGEPAGE on and off - for ARC !
I can test some more if u point me to.
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2015-10-09 11:43 [PATCH v3] mm,thp: reduce ifdef'ery for THP in generic code Vineet Gupta
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