[PATCH v3 1/3] mm/vmalloc: don't set area->caller twice

[PATCH v3 1/3] mm/vmalloc: don't set area->caller twice

[Wanpeng Li]

Changelog:
 *v1 -> v2: rebase against mmotm tree

The caller address has already been set in set_vmalloc_vm(), there's no need
to set it again in __vmalloc_area_node.

Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 mm/vmalloc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 1074543..d78d117 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1566,7 +1566,6 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
 		pages = kmalloc_node(array_size, nested_gfp, node);
 	}
 	area->pages = pages;
-	area->caller = caller;
 	if (!area->pages) {
 		remove_vm_area(area->addr);
 		kfree(area);
-- 
1.8.1.2

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[PATCH v3 2/3] mm/vmalloc: revert "mm/vmalloc.c: emit the failure message before return"

[Wanpeng Li]

Changelog:
 *v2 -> v3: revert commit 46c001a2 directly

Don't warning twice in __vmalloc_area_node and __vmalloc_node_range if
__vmalloc_area_node allocation failure. This patch revert commit 46c001a2
(mm/vmalloc.c: emit the failure message before return).

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 mm/vmalloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d78d117..e3ec8b4 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1635,7 +1635,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align,
 
 	addr = __vmalloc_area_node(area, gfp_mask, prot, node, caller);
 	if (!addr)
-		goto fail;
+		return NULL;
 
 	/*
 	 * In this function, newly allocated vm_struct has VM_UNINITIALIZED
-- 
1.8.1.2

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[PATCH v3 3/3] mm/vmalloc: revert "mm/vmalloc.c: check VM_UNINITIALIZED flag in s_show instead of show_numa_info"

[Wanpeng Li]

Changelog:
 *v2 -> v3: revert commit d157a558 directly

The VM_UNINITIALIZED/VM_UNLIST flag introduced by commit 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 move the check just before show_numa_info in order that
some messages still can be dumped via /proc/vmallocinfo. This patch revert 
commit d157a558 (mm/vmalloc.c: check VM_UNINITIALIZED flag in s_show instead 
of show_numa_info);

Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
---
 mm/vmalloc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index e3ec8b4..5368b17 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2562,6 +2562,11 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
 		if (!counters)
 			return;
 
+		/* Pair with smp_wmb() in clear_vm_uninitialized_flag() */
+		smp_rmb();
+		if (v->flags & VM_UNINITIALIZED)
+			return;
+
 		memset(counters, 0, nr_node_ids * sizeof(unsigned int));
 
 		for (nr = 0; nr < v->nr_pages; nr++)
@@ -2590,11 +2595,6 @@ static int s_show(struct seq_file *m, void *p)
 
 	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);
 
-- 
1.8.1.2

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