Subject: + mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info.patch added to -mm tree
To: liwanp@xxxxxxxxxxxxxxxxxx,mitsuo.hayasaka.hu@xxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 17 Sep 2013 13:11:58 -0700
The patch titled
Subject: mm/vmalloc: move VM_UNINITIALIZED to just before show_numa_info
has been added to the -mm tree. Its filename is
mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info.patch
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------------------------------------------------------
From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Subject: mm/vmalloc: move VM_UNINITIALIZED to just before show_numa_info
The VM_UNINITIALIZED/VM_UNLIST flag introduced by f5252e00 ("mm: avoid
null pointer access in vm_struct via /proc/vmallocinfo") is used to avoid
accessing the pages field with unallocated page when show_numa_info() is
called.
This patch moves the check to just before show_numa_info in order that
some messages still can be dumped via /proc/vmallocinfo.
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Cc: Mitsuo Hayasaka <mitsuo.hayasaka.hu@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/vmalloc.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff -puN mm/vmalloc.c~mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info mm/vmalloc.c
--- a/mm/vmalloc.c~mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info
+++ a/mm/vmalloc.c
@@ -2591,11 +2591,6 @@ static int s_show(struct seq_file *m, vo
v = va->vm;
- /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
- smp_rmb();
- if (v->flags & VM_UNINITIALIZED)
- return 0;
-
seq_printf(m, "0x%pK-0x%pK %7ld",
v->addr, v->addr + v->size, v->size);
@@ -2623,6 +2618,11 @@ static int s_show(struct seq_file *m, vo
if (v->flags & VM_VPAGES)
seq_printf(m, " vpages");
+ /* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
+ smp_rmb();
+ if (v->flags & VM_UNINITIALIZED)
+ return;
+
show_numa_info(m, v);
seq_putc(m, '\n');
return 0;
_
Patches currently in -mm which might be from liwanp@xxxxxxxxxxxxxxxxxx are
origin.patch
revert-mm-memory-hotplug-fix-lowmem-count-overflow-when-offline-pages.patch
ksm-remove-redundant-__gfp_zero-from-kcalloc.patch
mm-vmalloc-dont-set-area-caller-twice.patch
mm-vmalloc-dont-warn-about-vmalloc-allocation-failure-twice.patch
mm-vmalloc-dont-warn-about-vmalloc-allocation-failure-twice-fix.patch
mm-vmalloc-move-vm_uninitialized-to-just-before-show_numa_info.patch
mm-drop-actor-argument-of-do_generic_file_read.patch
mm-drop-actor-argument-of-do_generic_file_read-fix.patch
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