* [PATCH] mm/sparse.c: Wrong allocation for mem_section
@ 2017-12-22 8:48 Baoquan He
2017-12-23 9:54 ` Kirill A. Shutemov
0 siblings, 1 reply; 2+ messages in thread
From: Baoquan He @ 2017-12-22 8:48 UTC (permalink / raw)
To: linux-kernel
Cc: Baoquan He, Ingo Molnar, Andrew Morton, Andy Lutomirski,
Peter Zijlstra, Thomas Gleixner, Atsushi Kumagai, linux-mm
In commit
83e3c48729 "mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y"
mem_section is allocated at runtime to save memory. While it allocates
the first dimension of array with sizeof(struct mem_section). It costs
extra memory, should be sizeof(struct mem_section*).
Fix it.
Signed-off-by: Baoquan He <bhe@redhat.com>
Tested-by: Dave Young <dyoung@redhat.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Atsushi Kumagai <ats-kumagai@wm.jp.nec.com>
Cc: linux-mm@kvack.org
---
mm/sparse.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/sparse.c b/mm/sparse.c
index 7a5dacaa06e3..2609aba121e8 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -211,7 +211,7 @@ void __init memory_present(int nid, unsigned long start, unsigned long end)
if (unlikely(!mem_section)) {
unsigned long size, align;
- size = sizeof(struct mem_section) * NR_SECTION_ROOTS;
+ size = sizeof(struct mem_section*) * NR_SECTION_ROOTS;
align = 1 << (INTERNODE_CACHE_SHIFT);
mem_section = memblock_virt_alloc(size, align);
}
--
2.5.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] mm/sparse.c: Wrong allocation for mem_section
2017-12-22 8:48 [PATCH] mm/sparse.c: Wrong allocation for mem_section Baoquan He
@ 2017-12-23 9:54 ` Kirill A. Shutemov
0 siblings, 0 replies; 2+ messages in thread
From: Kirill A. Shutemov @ 2017-12-23 9:54 UTC (permalink / raw)
To: Baoquan He
Cc: linux-kernel, Ingo Molnar, Andrew Morton, Andy Lutomirski,
Peter Zijlstra, Thomas Gleixner, Atsushi Kumagai, linux-mm
On Fri, Dec 22, 2017 at 04:48:18PM +0800, Baoquan He wrote:
> In commit
>
> 83e3c48729 "mm/sparsemem: Allocate mem_section at runtime for CONFIG_SPARSEMEM_EXTREME=y"
>
> mem_section is allocated at runtime to save memory. While it allocates
> the first dimension of array with sizeof(struct mem_section). It costs
> extra memory, should be sizeof(struct mem_section*).
>
> Fix it.
>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Tested-by: Dave Young <dyoung@redhat.com>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Atsushi Kumagai <ats-kumagai@wm.jp.nec.com>
> Cc: linux-mm@kvack.org
Ughh. Sorry.
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Please queue it to stable.
--
Kirill A. Shutemov
^ permalink raw reply [flat|nested] 2+ messages in thread
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