From: Martin KaFai Lau <kafai@fb.com>
Date: Mon, 20 Oct 2014 20:42:43 +0000 (-0700)
Subject: ipv6: Remove BACKTRACK macro
X-Git-Tag: omap-for-v3.20/drop-legacy-3517~122^2~356^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a3c00e46efdb4009369971c97203ea67f7630fe4;p=pandora-kernel.git

ipv6: Remove BACKTRACK macro

It is the prep work to reduce the number of calls to fib6_lookup().

The BACKTRACK macro could be hard-to-read and error-prone due to
its side effects (mainly goto).

This patch is to:
1. Replace BACKTRACK macro with a function (fib6_backtrack) with the following
   return values:
   * If it is backtrack-able, returns next fn for retry.
   * If it reaches the root, returns NULL.
2. The caller needs to decide if a backtrack is needed (by testing
   rt == net->ipv6.ip6_null_entry).
3. Rename the goto labels in ip6_pol_route() to make the next few
   patches easier to read.

Cc: David Miller <davem@davemloft.net>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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