[3.16-stable,13/14] net/xen-netback: disable on 64KB page granularity

Message ID 20170509100502.1358298-14-arnd@arndb.de
State New
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  • [3.16-stable,01/14] staging: r8192ee: prorperly format warning message
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Commit Message

Arnd Bergmann May 9, 2017, 10:05 a.m.
Building the linux-3.16 stable branch, I ran into this warning that
shows a serious problem in the xen-netback driver:

drivers/net/xen-netback/netback.c: In function 'xenvif_dealloc_kthread':
drivers/net/xen-netback/netback.c:2002:1: error: the frame size of 16384 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

The bug was fixed in linux-4.4, but for any older stable kernel we
either need to backport that fix, or not use the driver when the page
size is set to 64KB. As the proper fix is way bigger than the usual limit
for stable backport patches, this adds a Kconfig dependency.

Fixes: d0089e8a0e4c ("net/xen-netback: Make it running on 64KB page granularity")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

 drivers/net/Kconfig | 3 +++
 1 file changed, 3 insertions(+)



diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 3fdfe317a6c5..b7e2fb72578d 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -331,6 +331,9 @@  config XEN_NETDEV_FRONTEND
 	tristate "Xen backend network device"
 	depends on XEN_BACKEND
+	depends on !(PAGE_SIZE_64KB || ARM64_64K_PAGES || \
+		     IA64_PAGE_SIZE_64KB || MICROBLAZE_64K_PAGES || \
 	  This driver allows the kernel to act as a Xen network driver
 	  domain which exports paravirtual network devices to other