linux-kernel - Re: [6/6] ppc: ebpf/jit: Implement JIT compiler for extended BPF

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Message-Id: <20160621065847.GD8886@naverao1-tp.localdomain>
Date:	Tue, 21 Jun 2016 12:28:47 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Michael Ellerman <mpe@...erman.id.au>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	netdev@...r.kernel.org, Matt Evans <matt@...abs.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Alexei Starovoitov <ast@...com>,
	Denis Kirjanov <kda@...ux-powerpc.org>,
	Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [6/6] ppc: ebpf/jit: Implement JIT compiler for extended BPF

On 2016/06/21 09:38AM, Michael Ellerman wrote:
> On Sun, 2016-06-19 at 23:06 +0530, Naveen N. Rao wrote:
> > On 2016/06/17 10:53PM, Michael Ellerman wrote:
> > > On Tue, 2016-07-06 at 13:32:23 UTC, "Naveen N. Rao" wrote:
> > > > diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
> > > > new file mode 100644
> > > > index 0000000..954ff53
> > > > --- /dev/null
> > > > +++ b/arch/powerpc/net/bpf_jit_comp64.c
> > > > @@ -0,0 +1,956 @@
> > > ...
> 
> > > > +
> > > > +static void bpf_jit_fill_ill_insns(void *area, unsigned int size)
> > > > +{
> > > > +	int *p = area;
> > > > +
> > > > +	/* Fill whole space with trap instructions */
> > > > +	while (p < (int *)((char *)area + size))
> > > > +		*p++ = BREAKPOINT_INSTRUCTION;
> > > > +}
> > > 
> > > This breaks the build for some configs, presumably you're missing a header:
> > > 
> > >   arch/powerpc/net/bpf_jit_comp64.c:30:10: error: 'BREAKPOINT_INSTRUCTION' undeclared (first use in this function)
> > > 
> > > http://kisskb.ellerman.id.au/kisskb/buildresult/12720611/
> > 
> > Oops. Yes, I should have caught that. I need to add:
> > 
> > #include <asm/kprobes.h>
> > 
> > in bpf_jit_comp64.c
> > 
> > Can you please check if it resolves the build error?
> 
> Can you? :D

:)
Sorry, I should have explained myself better. I did actually try your 
config and I was able to reproduce the build error. After the above 
#include, that error went away, but I saw some vdso related errors. I 
thought I was doing something wrong and needed a different setup for 
that particular kernel config, which is why I requested your help in the 
matter. I just didn't do a good job of putting across that message...

Note to self: randconfig builds *and* more time drafting emails :)

Do you want me to respin the patches?


Thanks,
Naveen