[PATCH 04/13] Add a vmalloc_node_user function

[PATCH 04/13] Add a vmalloc_node_user function

[Bernd Schubert]

This is to have a numa aware vmalloc function for memory exposed to
userspace. Fuse uring will allocate queue memory using this
new function.

Signed-off-by: Bernd Schubert <bschubert@ddn.com>
cc: Andrew Morton <akpm@linux-foundation.org>
cc: Uladzislau Rezki <urezki@gmail.com>
cc: Christoph Hellwig <hch@infradead.org>
cc: linux-mm@kvack.org
cc: Miklos Szeredi <miklos@szeredi.hu>
cc: linux-fsdevel@vger.kernel.org
cc: Amir Goldstein <amir73il@gmail.com>
cc: fuse-devel@lists.sourceforge.net
---
 include/linux/vmalloc.h |  1 +
 mm/nommu.c              |  6 ++++++
 mm/vmalloc.c            | 41 +++++++++++++++++++++++++++++++++++++----
 3 files changed, 44 insertions(+), 4 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 096d48aa3437..e4e6f8f220b9 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -142,6 +142,7 @@ static inline unsigned long vmalloc_nr_pages(void) { return 0; }
 extern void *vmalloc(unsigned long size) __alloc_size(1);
 extern void *vzalloc(unsigned long size) __alloc_size(1);
 extern void *vmalloc_user(unsigned long size) __alloc_size(1);
+extern void *vmalloc_node_user(unsigned long size, int node) __alloc_size(1);
 extern void *vmalloc_node(unsigned long size, int node) __alloc_size(1);
 extern void *vzalloc_node(unsigned long size, int node) __alloc_size(1);
 extern void *vmalloc_32(unsigned long size) __alloc_size(1);
diff --git a/mm/nommu.c b/mm/nommu.c
index 5b83938ecb67..a7710c90447a 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -186,6 +186,12 @@ void *vmalloc_user(unsigned long size)
 }
 EXPORT_SYMBOL(vmalloc_user);
 
+void *vmalloc_node_user(unsigned long size, int node)
+{
+	return __vmalloc_user_flags(size, GFP_KERNEL | __GFP_ZERO);
+}
+EXPORT_SYMBOL(vmalloc_node_user);
+
 struct page *vmalloc_to_page(const void *addr)
 {
 	return virt_to_page(addr);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index ca71de7c9d77..9ad98e6c5e59 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -3367,6 +3367,25 @@ void *vzalloc(unsigned long size)
 }
 EXPORT_SYMBOL(vzalloc);
 
+/**
+ * _vmalloc_node_user - allocate zeroed virtually contiguous memory for userspace
+ * on the given numa node
+ * @size: allocation size
+ * @node: numa node
+ *
+ * The resulting memory area is zeroed so it can be mapped to userspace
+ * without leaking data.
+ *
+ * Return: pointer to the allocated memory or %NULL on error
+ */
+static void *_vmalloc_node_user(unsigned long size, int node)
+{
+	return __vmalloc_node_range(size, SHMLBA,  VMALLOC_START, VMALLOC_END,
+				    GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL,
+				    VM_USERMAP, node,
+				    __builtin_return_address(0));
+}
+
 /**
  * vmalloc_user - allocate zeroed virtually contiguous memory for userspace
  * @size: allocation size
@@ -3378,13 +3397,27 @@ EXPORT_SYMBOL(vzalloc);
  */
 void *vmalloc_user(unsigned long size)
 {
-	return __vmalloc_node_range(size, SHMLBA,  VMALLOC_START, VMALLOC_END,
-				    GFP_KERNEL | __GFP_ZERO, PAGE_KERNEL,
-				    VM_USERMAP, NUMA_NO_NODE,
-				    __builtin_return_address(0));
+	return _vmalloc_node_user(size, NUMA_NO_NODE);
 }
 EXPORT_SYMBOL(vmalloc_user);
 
+/**
+ * vmalloc_user - allocate zeroed virtually contiguous memory for userspace on
+ *                a numa node
+ * @size: allocation size
+ * @node: numa node
+ *
+ * The resulting memory area is zeroed so it can be mapped to userspace
+ * without leaking data.
+ *
+ * Return: pointer to the allocated memory or %NULL on error
+ */
+void *vmalloc_node_user(unsigned long size, int node)
+{
+	return _vmalloc_node_user(size, node);
+}
+EXPORT_SYMBOL(vmalloc_node_user);
+
 /**
  * vmalloc_node - allocate memory on a specific node
  * @size:	  allocation size
-- 
2.37.2

Re: [PATCH 04/13] Add a vmalloc_node_user function

[Andrew Morton]

On Tue, 21 Mar 2023 02:10:38 +0100 Bernd Schubert <bschubert@ddn.com> wrote:

> This is to have a numa aware vmalloc function for memory exposed to
> userspace. Fuse uring will allocate queue memory using this
> new function.
> 

Acked-by: Andrew Morton <akpm@linux-foundation.org>