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AJvYcCXdBnl8VG6WNMdIgXZeJXTi3swchbc/ucyHYhHnK57KzmTH3emuPppilKh5c4698Vj5H0yKXe8KaQ==@kvack.org X-Gm-Message-State: AOJu0YyOhQCzAejkN+pok7yQz7vc5bqCevQxFWDRDztvXODFBXZVKBZX q18rZfFmksZB7YjKv2v1VgBqTAmXg5MeqyW3s4WlX3NNrknTuWYU6/dxuGZuVNvqPtJJBjo30S7 ZU7+/H46xDe9lv8zIE3Mhz70IIrk= X-Gm-Gg: ASbGnctubAHGKYC1cSR/yw9RouDFSuZHT3BzAnBmoOTjr1a1Ftb1Bpe4kn2rWZvwbdV lDnvoPfyNsxNjb9mxnlmmQ7zs1kWcC43rB+pevKqs07OwKettdvceWpmOjSDnQg1UKb9YAxTG5X TmgQ9nEIOghaBSJMF1K82EPg== X-Google-Smtp-Source: AGHT+IHLILaO4FHiXQ6HEiLldUu+4jbxiwgECUQrUvKhKnrG8lAE04WZLWRoT4ZI6kZE9adL8Z8pGuxkMOFYudtSW8E= X-Received: by 2002:a05:651c:556:b0:30b:ef98:4653 with SMTP id 38308e7fff4ca-30f438c8db8mr7664881fa.36.1744199018584; Wed, 09 Apr 2025 04:43:38 -0700 (PDT) MIME-Version: 1.0 References: <20250127160709.80604-1-ubizjak@gmail.com> <20250127160709.80604-7-ubizjak@gmail.com> <66e54eb9-58b3-4559-af32-66a77fe1ea01@kernel.org> In-Reply-To: <66e54eb9-58b3-4559-af32-66a77fe1ea01@kernel.org> From: Uros Bizjak Date: Wed, 9 Apr 2025 13:43:27 +0200 X-Gm-Features: ATxdqUGmbJ5OXHqfwIkM9Wrb_lrcpIIkF68sC66bDwJWw_DGX50EuQ2sGGGHMMs Message-ID: Subject: Re: [PATCH v4 6/6] percpu/x86: Enable strict percpu checks via named AS qualifiers To: Jiri Slaby Cc: x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-bcachefs@vger.kernel.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, Nadav Amit , Dennis Zhou , Tejun Heo , Christoph Lameter , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Linus Torvalds , Andy Lutomirski , Brian Gerst , Peter Zijlstra Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Stat-Signature: conu9oqei8zan415fgcqgixztzy7cy4g X-Rspam-User: X-Rspamd-Queue-Id: B99801C0009 X-Rspamd-Server: rspam08 X-HE-Tag: 1744199020-967419 X-HE-Meta: U2FsdGVkX1+IfUEA56D2o5uhqbHCwqLOBjLkytWbZ+HZiBEwFoLUsZ9jtcHLLWxcjaXLaVqI4UVDht/7QAKlUNgIqRs1lDXtwfsLs9bqVnaLeLB/WbT89q+VqzXUKzWO8SsSi6IlZsxyEQhxcpn0tVifwd9aW/bIoLCqmXr8dHbXnP4+OMV9zbs00YzrVVPKx8FXQM4OhUpHdCbqHi5mVZG8ZNvEYCSx7xnJFIgKC6KCTtT5FcxnFuBSeiWs5WUreMMafiVa18IWdJXdyAVpUpbJEVUjnHTybShPDAfQhcyC+Qh+k3NFi+gu33BINlx75uqzIn/A/HZunSLHqItkRvLOHl5NYD1oBGpbVxer3G5Ws7rT2LydZkmoxa44rgiUhGeGSaTaET1fbJQQ5/eauIrbFEOdyv4u/gPZYCTS76AN9em7m3UwhuttOH8RgQuS7Cfb4XGgHd48H5kixZjEgmLlJEIeL7Oq2ZWo475gfheI36a7MYuf3flX3vilOyFGxTqU3cpljGeL0qQkXviJmWTvDpVlNd0rOEH2nTT4gC1fut9Lo7IwNn/I29pc7XUWq90Oo3i9TcMgNWp8DmA8QwdtFbDJAsBGDzPaHNn8G3IhpgX7czhw8jMQjGybHK+Z+rnwucHOCFxhprbrKwD2+uXfHYHGRuJjQWkdpea0DDkfyImnxo7zSizDeD6+u5p3U/ggqLZpU0ftWSNDEIfc0EFqrdi1OdLx5exlPgN+qhaCToy8F8AkM9rn8gPpfm/L0f3bt7kCnrvdfml58OZXQoKr3RoD+m93vPDHVlClhKxQNvWXsH78c6IlUOvkMzOTLOr+Asdycqi3vD8JHHrEqHqeki99nenxk+TB7X6nOt8BbFqeRCeTMYYE+UliLKnfEcjNt9hfPOWHCYIg2mDda8NwNcdxvoGGdkj898O24wW+izSIN3kCGI25Hg8KwJTJ2xsoGj/6I3IZg1HL9RD eb1t6S8K x7qjmlhfchvzMX4DeXPDd8hUbG2G3eiN98o1HP0iD03w5Dgl/JWRq2o4OE1xrgLovNzOHDj8eWyBIIQRMq/XycYpkCJt8aCW08ucwv6FBatzcOFD9l7fw7PRUikc9u55ia3tnrrzqbvaipy81GLgdZBp6yrEwPaoARdmt6jYkZbgQSg/r0se3Rz0DaRBCVmLM9dKi0sHesplv4d/eCpujEQH9m8s+Ntmamvo2KPtfHEBr9QKA8XSdeKspOy6InaztZeK0ro8MmLaKV9VIKQJM8+OWSEzLiD/67KDc4fRAAwG0ZKQHVs36+APkWgFs1UrtqEbV3TNYtq2G1LRPJl+xoEVj9aPtQ2Pw6ywlbClMwYvQhu6t4PZnK0KA9npq+heGRWNB/Ffs2Ttpj/+zObEQa7/+352T43RHjnxR1i0sBIkFHelFtwRT1vgc0Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Apr 9, 2025 at 1:07=E2=80=AFPM Jiri Slaby wr= ote: > > On 27. 01. 25, 17:05, Uros Bizjak wrote: > > This patch declares percpu variables in __seg_gs/__seg_fs named AS > > and keeps them named AS qualified until they are dereferenced with > > percpu accessor. This approach enables various compiler check > > for cross-namespace variable assignments. > > So this causes modpost to fail to version some symbols: > > > WARNING: modpost: EXPORT symbol "xen_vcpu_id" [vmlinux] version generat= ion failed, symbol will not be versioned. > > Is "xen_vcpu_id" prototyped in ? > > WARNING: modpost: EXPORT symbol "irq_stat" [vmlinux] version generation= failed, symbol will not be versioned. > > Is "irq_stat" prototyped in ? > > WARNING: modpost: EXPORT symbol "fred_rsp0" [vmlinux] version generatio= n failed, symbol will not be versioned. > > Is "fred_rsp0" prototyped in ? > > WARNING: modpost: EXPORT symbol "cpu_dr7" [vmlinux] version generation = failed, symbol will not be versioned. > > Is "cpu_dr7" prototyped in ? > > WARNING: modpost: EXPORT symbol "cpu_tss_rw" [vmlinux] version generati= on failed, symbol will not be versioned. > > Is "cpu_tss_rw" prototyped in ? > > WARNING: modpost: EXPORT symbol "__tss_limit_invalid" [vmlinux] version= generation failed, symbol will not be versioned. > > Is "__tss_limit_invalid" prototyped in ? > > WARNING: modpost: EXPORT symbol "irq_fpu_usable" [vmlinux] version gene= ration failed, symbol will not be versioned. > > Is "irq_fpu_usable" prototyped in ? > > WARNING: modpost: EXPORT symbol "cpu_info" [vmlinux] version generation= failed, symbol will not be versioned. > > Is "cpu_info" prototyped in ? > > WARNING: modpost: EXPORT symbol "gdt_page" [vmlinux] version generation= failed, symbol will not be versioned. > > Is "gdt_page" prototyped in ? > > ... > > That happens both with 6.15-rc1 and today's -next. Ideas? https://lore.kernel.org/lkml/20250404102535.705090-1-ubizjak@gmail.com/ Uros.