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From: Karl Mehltretter <kmehltretter@gmail.com>
To: Hari Bathini <hbathini@linux.ibm.com>,
	 "Christophe Leroy (CS GROUP)" <chleroy@kernel.org>,
	Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Naveen N Rao <naveen@kernel.org>,
	 Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>,
	 Abhishek Dubey <adubey@linux.ibm.com>,
	Dan Carpenter <error27@gmail.com>,
	 Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	 Andrii Nakryiko <andrii@kernel.org>,
	bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	 linux-kernel@vger.kernel.org, kernel test robot <lkp@intel.com>
Subject: Re: [PATCH] powerpc32/bpf: return false from bpf_jit_supports_fsession() on ppc32
Date: Sat, 14 Nov 2026 10:27:32 +0100	[thread overview]
Message-ID: <avgpYvt_Gf_1obem@gmail.com> (raw)
In-Reply-To: <20261003184226.76740-1-kmehltretter@gmail.com>

On Sat, Oct 03, 2026 at 08:42:26PM +0100, Karl Mehltretter wrote:
> bpf_jit_supports_fsession() returns bool. Commit 92258b5bf1ec
> ("powerpc32/bpf: Add fsession support") made it return -EOPNOTSUPP on
> ppc32 until fsession is validated there. The negative value converts to
> true, so the verifier does not reject fsession programs on ppc32. Such a
> program loads, and only attaching it fails because
> __arch_prepare_bpf_trampoline() returns -EOPNOTSUPP on ppc32.
> 
> Return false instead. The load then fails with "JIT does not support
> fsession". Tested with a ppc32 kernel on QEMU g3beige.
> 
> Fixes: 92258b5bf1ec ("powerpc32/bpf: Add fsession support")
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <error27@gmail.com>
> Closes: https://lore.kernel.org/r/202608010958.cYfBCQAC-lkp@intel.com/

A friendly ping on this ppc32 BPF fsession fix. Patchwork on netdevbpf
marks it awaiting-upstream for the powerpc tree. Is anything else needed
from my side?

Thanks,
Karl

      reply	other threads:[~2026-11-14  9:27 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-03 18:42 [PATCH] powerpc32/bpf: return false from bpf_jit_supports_fsession() on ppc32 Karl Mehltretter
2026-11-14  9:27 ` Karl Mehltretter [this message]

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