From f63a372e33e3dc51db6cc4dce13bfbd5db6817bf Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 9 May 2017 12:05:01 +0200 Subject: [PATCH] net/xen-netback: disable on 64KB page granularity 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 Signed-off-by: Ben Hutchings --- drivers/net/Kconfig | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig index 3fdfe317a6c54..b7e2fb72578da 100644 --- a/drivers/net/Kconfig +++ b/drivers/net/Kconfig @@ -331,6 +331,9 @@ config XEN_NETDEV_FRONTEND config XEN_NETDEV_BACKEND tristate "Xen backend network device" depends on XEN_BACKEND + depends on !(PAGE_SIZE_64KB || ARM64_64K_PAGES || \ + IA64_PAGE_SIZE_64KB || MICROBLAZE_64K_PAGES || \ + PARISC_PAGE_SIZE_64KB || PPC_64K_PAGES) help This driver allows the kernel to act as a Xen network driver domain which exports paravirtual network devices to other