* [PATCH] parisc: fix pmd accounting with 3-level page tables
@ 2015-03-13 10:30 ` Kirill A. Shutemov
0 siblings, 0 replies; 4+ messages in thread
From: Kirill A. Shutemov @ 2015-03-13 10:30 UTC (permalink / raw)
To: Andrew Morton
Cc: linux-mm, linux-kernel, linux-parisc, Kirill A. Shutemov,
John David Anglin, Aaro Koskinen, Graham Gower,
Domenico Andreoli
There's hack in pgd_alloc() on parisc to initialize one pmd, which is
not accounted. It leads to underflow on exit.
Let's adjust nr_pmds on pgd_alloc() to get accounting correct.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: John David Anglin <dave.anglin@bell.net>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Graham Gower <graham.gower@gmail.com>
Cc: Domenico Andreoli <cavokz@gmail.com>
---
arch/parisc/include/asm/pgalloc.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index 55ad8be9b7f3..068b2fb9a47c 100644
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -38,6 +38,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
/* The first pmd entry also is marked with _PAGE_GATEWAY as
* a signal that this pmd may not be freed */
__pgd_val_set(*pgd, PxD_FLAG_ATTACHED);
+ mm_inc_nr_pmds(mm);
#endif
}
return actual_pgd;
--
2.1.4
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] parisc: fix pmd accounting with 3-level page tables
@ 2015-03-13 10:30 ` Kirill A. Shutemov
0 siblings, 0 replies; 4+ messages in thread
From: Kirill A. Shutemov @ 2015-03-13 10:30 UTC (permalink / raw)
To: Andrew Morton
Cc: linux-mm, linux-kernel, linux-parisc, Kirill A. Shutemov,
John David Anglin, Aaro Koskinen, Graham Gower,
Domenico Andreoli
There's hack in pgd_alloc() on parisc to initialize one pmd, which is
not accounted. It leads to underflow on exit.
Let's adjust nr_pmds on pgd_alloc() to get accounting correct.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: John David Anglin <dave.anglin@bell.net>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Graham Gower <graham.gower@gmail.com>
Cc: Domenico Andreoli <cavokz@gmail.com>
---
arch/parisc/include/asm/pgalloc.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
index 55ad8be9b7f3..068b2fb9a47c 100644
--- a/arch/parisc/include/asm/pgalloc.h
+++ b/arch/parisc/include/asm/pgalloc.h
@@ -38,6 +38,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
/* The first pmd entry also is marked with _PAGE_GATEWAY as
* a signal that this pmd may not be freed */
__pgd_val_set(*pgd, PxD_FLAG_ATTACHED);
+ mm_inc_nr_pmds(mm);
#endif
}
return actual_pgd;
--
2.1.4
--
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^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] parisc: fix pmd accounting with 3-level page tables
2015-03-13 10:30 ` Kirill A. Shutemov
@ 2015-03-13 21:50 ` Graham Gower
-1 siblings, 0 replies; 4+ messages in thread
From: Graham Gower @ 2015-03-13 21:50 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Andrew Morton, linux-mm, linux-kernel, linux-parisc,
John David Anglin, Aaro Koskinen, Domenico Andreoli
This fixes the problem on my C8000.
Tested-by: graham.gower@gmail.com
On 13 March 2015 at 21:00, Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
> There's hack in pgd_alloc() on parisc to initialize one pmd, which is
> not accounted. It leads to underflow on exit.
>
> Let's adjust nr_pmds on pgd_alloc() to get accounting correct.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: John David Anglin <dave.anglin@bell.net>
> Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
> Cc: Graham Gower <graham.gower@gmail.com>
> Cc: Domenico Andreoli <cavokz@gmail.com>
> ---
> arch/parisc/include/asm/pgalloc.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
> index 55ad8be9b7f3..068b2fb9a47c 100644
> --- a/arch/parisc/include/asm/pgalloc.h
> +++ b/arch/parisc/include/asm/pgalloc.h
> @@ -38,6 +38,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
> /* The first pmd entry also is marked with _PAGE_GATEWAY as
> * a signal that this pmd may not be freed */
> __pgd_val_set(*pgd, PxD_FLAG_ATTACHED);
> + mm_inc_nr_pmds(mm);
> #endif
> }
> return actual_pgd;
> --
> 2.1.4
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] parisc: fix pmd accounting with 3-level page tables
@ 2015-03-13 21:50 ` Graham Gower
0 siblings, 0 replies; 4+ messages in thread
From: Graham Gower @ 2015-03-13 21:50 UTC (permalink / raw)
To: Kirill A. Shutemov
Cc: Andrew Morton, linux-mm, linux-kernel, linux-parisc,
John David Anglin, Aaro Koskinen, Domenico Andreoli
This fixes the problem on my C8000.
Tested-by: graham.gower@gmail.com
On 13 March 2015 at 21:00, Kirill A. Shutemov
<kirill.shutemov@linux.intel.com> wrote:
> There's hack in pgd_alloc() on parisc to initialize one pmd, which is
> not accounted. It leads to underflow on exit.
>
> Let's adjust nr_pmds on pgd_alloc() to get accounting correct.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: John David Anglin <dave.anglin@bell.net>
> Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
> Cc: Graham Gower <graham.gower@gmail.com>
> Cc: Domenico Andreoli <cavokz@gmail.com>
> ---
> arch/parisc/include/asm/pgalloc.h | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/parisc/include/asm/pgalloc.h b/arch/parisc/include/asm/pgalloc.h
> index 55ad8be9b7f3..068b2fb9a47c 100644
> --- a/arch/parisc/include/asm/pgalloc.h
> +++ b/arch/parisc/include/asm/pgalloc.h
> @@ -38,6 +38,7 @@ static inline pgd_t *pgd_alloc(struct mm_struct *mm)
> /* The first pmd entry also is marked with _PAGE_GATEWAY as
> * a signal that this pmd may not be freed */
> __pgd_val_set(*pgd, PxD_FLAG_ATTACHED);
> + mm_inc_nr_pmds(mm);
> #endif
> }
> return actual_pgd;
> --
> 2.1.4
>
--
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^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2015-03-13 21:50 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2015-03-13 10:30 [PATCH] parisc: fix pmd accounting with 3-level page tables Kirill A. Shutemov
2015-03-13 10:30 ` Kirill A. Shutemov
2015-03-13 21:50 ` Graham Gower
2015-03-13 21:50 ` Graham Gower
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