netdev - Re: [REGRESSION][PATCH V4 3/3] bpf jit: Let the powerpc jit handle negative offsets

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Date:	Mon, 30 Apr 2012 14:11:28 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	David Miller <davem@...emloft.net>
Cc:	kaffeemonster@...glemail.com, eric.dumazet@...il.com,
	matt@...abs.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [REGRESSION][PATCH V4 3/3] bpf jit: Let the powerpc jit handle
 negative offsets

On Mon, 2012-04-30 at 12:43 +1000, Benjamin Herrenschmidt wrote:

> > Matt's having a look at powerpc
> 
> Ok, he hasn't so I'll dig a bit.
> 
> No obvious wrongness (but I'm not very familiar with bpf), though I do
> have a comment: sk_negative_common() and bpf_slow_path_common() should
> be made one and single macro which takes the fallback function as an
> argument.

Ok, with the compile fix below it seems to work for me:

(Feel free to fold that into the original patch)

diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h
index af1ab5e..5c3cf2d 100644
--- a/arch/powerpc/net/bpf_jit.h
+++ b/arch/powerpc/net/bpf_jit.h
@@ -48,7 +48,13 @@
 /*
  * Assembly helpers from arch/powerpc/net/bpf_jit.S:
  */
-extern u8 sk_load_word[], sk_load_half[], sk_load_byte[], sk_load_byte_msh[];
+#define DECLARE_LOAD_FUNC(func)	\
+	extern u8 func[], func##_negative_offset[], func##_positive_offset[]
+
+DECLARE_LOAD_FUNC(sk_load_word);
+DECLARE_LOAD_FUNC(sk_load_half);
+DECLARE_LOAD_FUNC(sk_load_byte);
+DECLARE_LOAD_FUNC(sk_load_byte_msh);
 
 #define FUNCTION_DESCR_SIZE	24
 
Cheers,
Ben.


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