Message ID | 20231012161237.114733-5-ubizjak@gmail.com |
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State | New |
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Peter Anvin" <hpa@zytor.com>, Peter Zijlstra <peterz@infradead.org> Subject: [PATCH 4/4] x86/percpu: Introduce %rip-relative addressing to PER_CPU_VAR macro Date: Thu, 12 Oct 2023 18:10:39 +0200 Message-ID: <20231012161237.114733-5-ubizjak@gmail.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231012161237.114733-1-ubizjak@gmail.com> References: <20231012161237.114733-1-ubizjak@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: <linux-kernel.vger.kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Thu, 12 Oct 2023 09:13:15 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1779566846809665793 X-GMAIL-MSGID: 1779566846809665793 |
Series |
Introduce %rip-relative addressing to PER_CPU_VAR macro
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Commit Message
Uros Bizjak
Oct. 12, 2023, 4:10 p.m. UTC
Introduce x86_64 %rip-relative addressing to PER_CPU_VAR macro.
Instruction with %rip-relative address operand is one byte shorter than
its absolute address counterpart and is also compatible with position
independent executable (-fpie) build.
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
---
arch/x86/include/asm/percpu.h | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h index 34734d730463..9a5f1896c5ef 100644 --- a/arch/x86/include/asm/percpu.h +++ b/arch/x86/include/asm/percpu.h @@ -4,16 +4,18 @@ #ifdef CONFIG_X86_64 #define __percpu_seg gs +#define __percpu_rel (%rip) #else #define __percpu_seg fs +#define __percpu_rel #endif #ifdef __ASSEMBLY__ #ifdef CONFIG_SMP -#define PER_CPU_VAR(var) %__percpu_seg:var +#define PER_CPU_VAR(var) %__percpu_seg:(var)##__percpu_rel #else /* ! SMP */ -#define PER_CPU_VAR(var) var +#define PER_CPU_VAR(var) (var)##__percpu_rel #endif /* SMP */ #ifdef CONFIG_X86_64_SMP