netdev - CONFIG_XPS depends on L1_CACHE_BYTES being greater than sizeof(struct xps

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Message-ID: <5629404B.8090805@gmx.de>
Date:	Thu, 22 Oct 2015 22:00:11 +0200
From:	Helge Deller <deller@....de>
To:	Tom Herbert <therbert@...gle.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Cc:	linux-parisc List <linux-parisc@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	John David Anglin <dave.anglin@...l.net>
Subject: CONFIG_XPS depends on L1_CACHE_BYTES being greater than sizeof(struct
 xps_map)

Hi Tom & David,

I've queued-up a patch for the parisc architecture which reduces L1_CACHE_BYTES from 32 to 16:
  https://patchwork.kernel.org/patch/7399291/

But this change will break the kernel build like this:

In file included from net/core/dev.c:92:0:
net/core/dev.c: In function ‘expand_xps_map’:
include/linux/netdevice.h:721:27: warning: overflow in implicit constant conversion [-Woverflow]
   #define XPS_MIN_MAP_ALLOC ((L1_CACHE_BYTES - sizeof(struct xps_map)) \
net/core/dev.c:1972:18: note: in expansion of macro ‘XPS_MIN_MAP_ALLOC’
   int alloc_len = XPS_MIN_MAP_ALLOC;

Do you see an easy way to fix this ?

Thanks,
Helge 
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