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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=TqIl0XsuMws2W7SAyTGgPlMUxJpmV31lTKH8j5/4FZ8=; b=k02cfDKyz+ZL2MObn/ey7DNaGZCIsPMwdCjYY210RRGRUIiY56keM4rDsZT2hZXVs0 +9wO+MhQW4mr368P0D/cpA0jrqqUKIFd7RkBuH/L1hc6vcsFG3qYk2P1yBPmwNGwPRoH G9hBovzqg1ZxLyt0Dua0/5xMc/TOShDXJbx+nC+88Y/VZ6ncYxdGtdLRmYgQEZJql9KN DSHoTfFqr7CtnHK6TkQdiX1bAXpA8XhhqkZ+6o+UjFophhhx9jOAB/g6o7PG9FYvWJO6 GcgICniPWIftDltn6WsvJ1DsUHaPjjLy9hKCGKse2mNEgzFzaP47Rz6rq3PxbBWJB9gt t3NA== X-Gm-Message-State: AOAM530X+f3+ikUAo05U9U85JhWSH35siLX5lBIoup0GiJ55WK6n8JOL TFvQOc8s2PoOciRO2q5K4AbWxCrensRLjXfWHxI= X-Google-Smtp-Source: ABdhPJzM+bDDdhQ1yuvEohGu3NxsCeWWPsxJypy/LfG2x1PLzd9dzX2AyM5yRCrQ0RzzRR4VA988AWIJ4v9Gjkgti5E= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:ad4:58e7:: with SMTP id di7mr18639207qvb.36.1600460139023; Fri, 18 Sep 2020 13:15:39 -0700 (PDT) Date: Fri, 18 Sep 2020 13:14:31 -0700 In-Reply-To: <20200918201436.2932360-1-samitolvanen@google.com> Message-Id: <20200918201436.2932360-26-samitolvanen@google.com> Mime-Version: 1.0 References: <20200918201436.2932360-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog Subject: [PATCH v3 25/30] arm64: vdso: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200918_161545_439777_1B4DDF8D X-CRM114-Status: GOOD ( 11.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, Steven Rostedt , clang-built-linux@googlegroups.com, Sami Tolvanen , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no point in using link-time optimization for the small about of C code. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/kernel/vdso/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index e836e300440f..aa47070a3ccf 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -30,7 +30,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \ + $(CC_FLAGS_LTO) KASAN_SANITIZE := n UBSAN_SANITIZE := n OBJECT_FILES_NON_STANDARD := y -- 2.28.0.681.g6f77f65b4e-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel