linux-kernel - [PATCH v2 1/4] kernfs: kvmalloc xattr value instead of kmalloc

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Date:   Thu,  5 Mar 2020 13:16:29 -0800
From:   Daniel Xu <dxu@...uu.xyz>
To:     cgroups@...r.kernel.org, tj@...nel.org, lizefan@...wei.com,
        hannes@...xchg.org
Cc:     Daniel Xu <dxu@...uu.xyz>, shakeelb@...gle.com,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        kernel-team@...com
Subject: [PATCH v2 1/4] kernfs: kvmalloc xattr value instead of kmalloc

It's not really necessary to have contiguous physical memory for xattr
values. We no longer need to worry about higher order allocations
failing with kvmalloc, especially because the xattr size limit is at
64K.

Signed-off-by: Daniel Xu <dxu@...uu.xyz>
---
 fs/xattr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/xattr.c b/fs/xattr.c
index 90dd78f0eb27..0d3c9b4d1914 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -817,7 +817,7 @@ struct simple_xattr *simple_xattr_alloc(const void *value, size_t size)
 	if (len < sizeof(*new_xattr))
 		return NULL;
 
-	new_xattr = kmalloc(len, GFP_KERNEL);
+	new_xattr = kvmalloc(len, GFP_KERNEL);
 	if (!new_xattr)
 		return NULL;
 
@@ -882,7 +882,7 @@ int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
 
 		new_xattr->name = kstrdup(name, GFP_KERNEL);
 		if (!new_xattr->name) {
-			kfree(new_xattr);
+			kvfree(new_xattr);
 			return -ENOMEM;
 		}
 	}
@@ -912,7 +912,7 @@ int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
 	spin_unlock(&xattrs->lock);
 	if (xattr) {
 		kfree(xattr->name);
-		kfree(xattr);
+		kvfree(xattr);
 	}
 	return err;
 
-- 
2.21.1