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Wed, 09 Apr 2025 04:43:38 -0700 (PDT) Precedence: bulk X-Mailing-List: linux-bcachefs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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 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.