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([2620:10d:c090:500::5:6b34]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29498d27433sm164768845ad.58.2025.10.29.17.44.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Oct 2025 17:44:09 -0700 (PDT) Message-ID: <50ddff79d33d6e2d57e104f610273d647530ddbc.camel@gmail.com> Subject: Re: [PATCH bpf-next v1 0/8] bpf: magic kernel functions From: Eduard Zingerman To: Ihor Solodrai , bpf@vger.kernel.org, andrii@kernel.org, ast@kernel.org Cc: dwarves@vger.kernel.org, alan.maguire@oracle.com, acme@kernel.org, tj@kernel.org, kernel-team@meta.com Date: Wed, 29 Oct 2025 17:44:07 -0700 In-Reply-To: <20251029190113.3323406-1-ihor.solodrai@linux.dev> References: <20251029190113.3323406-1-ihor.solodrai@linux.dev> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-10-29 at 12:01 -0700, Ihor Solodrai wrote: Do we break compatibility with old pahole versions after this patch-set? Old paholes won't synthesize the _impl kfuncs, so: - binary compatibility between new-kernel/old-pahole + old-bpf will be broken, as there would be no _impl kfuncs; - new-kernel/old-pahole + new-bpf won't work either, as kernel will be unable to find non-_impl function names for existing kfuncs. [...]