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Peter Anvin" To: Uros Bizjak , 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 , Linus Torvalds , Andy Lutomirski , Brian Gerst , Peter Zijlstra Subject: =?US-ASCII?Q?Re=3A_=5BPATCH_v4_6/6=5D_percpu/x86=3A_Enable_str?= =?US-ASCII?Q?ict_percpu_checks_via_named_AS_qualifiers?= User-Agent: K-9 Mail for Android In-Reply-To: References: <20250127160709.80604-1-ubizjak@gmail.com> <20250127160709.80604-7-ubizjak@gmail.com> <66e54eb9-58b3-4559-af32-66a77fe1ea01@kernel.org> Message-ID: <77B3F3ED-102D-4759-98F1-622629EBF9AF@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 78261A000B X-Stat-Signature: jorhgt8tw8814nqmd7348aioz8fe4ahi X-Rspam-User: X-HE-Tag: 1744211397-214516 X-HE-Meta: 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 l9lac+35 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 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 April 9, 2025 4:43:27 AM PDT, Uros Bizjak wrote: >On Wed, Apr 9, 2025 at 1:07=E2=80=AFPM Jiri Slaby wrote: >> >> On 27=2E 01=2E 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=2E This approach enables various compiler check >> > for cross-namespace variable assignments=2E >> >> So this causes modpost to fail to version some symbols: >> >> > WARNING: modpost: EXPORT symbol "xen_vcpu_id" [vmlinux] version gener= ation failed, symbol will not be versioned=2E >> > Is "xen_vcpu_id" prototyped in ? >> > WARNING: modpost: EXPORT symbol "irq_stat" [vmlinux] version generati= on failed, symbol will not be versioned=2E >> > Is "irq_stat" prototyped in ? >> > WARNING: modpost: EXPORT symbol "fred_rsp0" [vmlinux] version generat= ion failed, symbol will not be versioned=2E >> > Is "fred_rsp0" prototyped in ? >> > WARNING: modpost: EXPORT symbol "cpu_dr7" [vmlinux] version generatio= n failed, symbol will not be versioned=2E >> > Is "cpu_dr7" prototyped in ? >> > WARNING: modpost: EXPORT symbol "cpu_tss_rw" [vmlinux] version genera= tion failed, symbol will not be versioned=2E >> > Is "cpu_tss_rw" prototyped in ? >> > WARNING: modpost: EXPORT symbol "__tss_limit_invalid" [vmlinux] versi= on generation failed, symbol will not be versioned=2E >> > Is "__tss_limit_invalid" prototyped in ? >> > WARNING: modpost: EXPORT symbol "irq_fpu_usable" [vmlinux] version ge= neration failed, symbol will not be versioned=2E >> > Is "irq_fpu_usable" prototyped in ? >> > WARNING: modpost: EXPORT symbol "cpu_info" [vmlinux] version generati= on failed, symbol will not be versioned=2E >> > Is "cpu_info" prototyped in ? >> > WARNING: modpost: EXPORT symbol "gdt_page" [vmlinux] version generati= on failed, symbol will not be versioned=2E >> > Is "gdt_page" prototyped in ? >> > =2E=2E=2E >> >> That happens both with 6=2E15-rc1 and today's -next=2E Ideas? > >https://lore=2Ekernel=2Eorg/lkml/20250404102535=2E705090-1-ubizjak@gmail= =2Ecom/ > >Uros=2E > A lot of those seem to be things that definitely shouldn't be expected=2E= =2E=2E