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Peter Anvin" , Linus Torvalds , Peter Zijlstra , Thomas Gleixner , Borislav Petkov , Josh Poimboeuf Subject: [RFC PATCH 2/4] x86/percpu: Detect compiler support for named address spaces Date: Sun, 1 Oct 2023 15:14:34 +0200 Message-ID: <20231001131620.112484-3-ubizjak@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231001131620.112484-1-ubizjak@gmail.com> References: <20231001131620.112484-1-ubizjak@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-0.6 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on pete.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (pete.vger.email [0.0.0.0]); Sun, 01 Oct 2023 06:17:07 -0700 (PDT) Detect compiler support for named address spaces by trying to compile a small testcase that includes __seg_gs and __seg_gs keywords. Reflect successful compilation in CC_HAS_NAMED_AS and set USE_X86_SEG_SUPPORT to signal when segment qualifiers should be used. Cc: Andy Lutomirski Cc: Ingo Molnar Cc: Nadav Amit Cc: Brian Gerst Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Borislav Petkov Cc: Josh Poimboeuf Signed-off-by: Uros Bizjak --- arch/x86/Kconfig | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 66bfabae8814..f66fa5bf1f78 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -2388,6 +2388,13 @@ source "kernel/livepatch/Kconfig" endmenu +config CC_HAS_NAMED_AS + def_bool $(success,echo 'int __seg_fs fs; int __seg_gs gs;' | $(CC) -x c - -c -o /dev/null) + +config USE_X86_SEG_SUPPORT + def_bool y + depends on CC_HAS_NAMED_AS && SMP + config CC_HAS_SLS def_bool $(cc-option,-mharden-sls=all) -- 2.41.0