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authorDavid S. Miller <davem@davemloft.net>2020-10-06 03:33:26 +0300
committerDavid S. Miller <davem@davemloft.net>2020-10-06 04:40:01 +0300
commit8b0308fe319b8002753ea66f8f940fb393792ddd (patch)
tree4c5a80346308db8cac9ff0951bb10e892c2387ad /include/linux/net.h
parentf4f9dcc3f4c5f576ee195bdf0fd1682da7a3a73a (diff)
parent7575fdda569b2a2e8be32c1a64ecb05d6f96a500 (diff)
downloadlinux-8b0308fe319b8002753ea66f8f940fb393792ddd.tar.xz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Rejecting non-native endian BTF overlapped with the addition of support for it. The rest were more simple overlapping changes, except the renesas ravb binding update, which had to follow a file move as well as a YAML conversion. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/net.h')
-rw-r--r--include/linux/net.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/net.h b/include/linux/net.h
index 7657c6432a69..0dcd51feef02 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -21,6 +21,7 @@
#include <linux/rcupdate.h>
#include <linux/once.h>
#include <linux/fs.h>
+#include <linux/mm.h>
#include <linux/sockptr.h>
#include <uapi/linux/net.h>
@@ -289,6 +290,21 @@ do { \
#define net_get_random_once_wait(buf, nbytes) \
get_random_once_wait((buf), (nbytes))
+/*
+ * E.g. XFS meta- & log-data is in slab pages, or bcache meta
+ * data pages, or other high order pages allocated by
+ * __get_free_pages() without __GFP_COMP, which have a page_count
+ * of 0 and/or have PageSlab() set. We cannot use send_page for
+ * those, as that does get_page(); put_page(); and would cause
+ * either a VM_BUG directly, or __page_cache_release a page that
+ * would actually still be referenced by someone, leading to some
+ * obscure delayed Oops somewhere else.
+ */
+static inline bool sendpage_ok(struct page *page)
+{
+ return !PageSlab(page) && page_count(page) >= 1;
+}
+
int kernel_sendmsg(struct socket *sock, struct msghdr *msg, struct kvec *vec,
size_t num, size_t len);
int kernel_sendmsg_locked(struct sock *sk, struct msghdr *msg,