[Xen-ia64-devel] [PATCH 06/27] ia64/xen: define NET_SKB_NET to 18 if xen.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On native ia64 NET_SKB_NET isn't necessary to define.
However on xen it needs to be slightly larger. (More specifically
it's xen-netfront.c requirement.)
It causes annoying kernel unalgned access message and
network layer troubles.
Resolve it by increasing NET_SKB_NET from the default value 16 to 18.

Cc: Kouya SHIMURA <kouya@xxxxxxxxxxxxxx>
Cc: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>
Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 arch/ia64/kernel/asm-offsets.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/arch/ia64/kernel/asm-offsets.c b/arch/ia64/kernel/asm-offsets.c
index 6bd3fc5..6a8d95e 100644
--- a/arch/ia64/kernel/asm-offsets.c
+++ b/arch/ia64/kernel/asm-offsets.c
@@ -292,6 +292,17 @@ void foo(void)
 #ifdef CONFIG_XEN
        BLANK();
 
+       {
+               union __net_skb_pad
+               {
+                       /* default NET_SKB_PAD (= 16) + NET_IP_ALIGN (= 2) */
+                       char xen_pad[16 + 2];
+               };
+               COMMENT("On xen NET_SKB_PAD needs to be");
+               COMMENT(" default NET_SKB_PAD (= 16) + NET_IP_ALIGN (= 2)");
+               DEFINE(NET_SKB_PAD, sizeof(union __net_skb_pad));
+       }
+
 #define DEFINE_MAPPED_REG_OFS(sym, field) \
        DEFINE(sym, (XMAPPEDREGS_OFS + offsetof(struct mapped_regs, field)))
 
-- 
1.5.3


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