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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 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_BLOCKED,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net 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 (howler.vger.email [0.0.0.0]); Sun, 01 Oct 2023 06:16:57 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1778570745936284677 X-GMAIL-MSGID: 1778570745936284677 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)