tree e3d41786d5e4390eaae2b1def522ca9f65a47dff
parent 305428acf02490dfaf68d2052d03fe2d74cad241
author Ronnie Sahlberg <lsahlber@redhat.com> 1511237287 +1100
committer Steve French <smfrench@gmail.com> 1516844945 -0600

cifs: avoid a kmalloc in smb2_send_recv/SendReceive2 for the common case

In both functions, use an array of 8 (arbitrary but should be big enough
for all current uses) iov and avoid having to kmalloc the array
for the common case.

If 8 is too small, then fall back to the original behaviour and use
kmalloc/kfree.

This should not change any behaviour but should save us a tiny amount of
cpu cycles.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>