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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=zm1uzmyUH/ec78UqO7SuMlzRHKM3BG4k+fqmwwznAmg=; b=BAfKM4rqbHZVWpNwMQW/NyTDT4/eaw0cRpnHFVX+IejlkjGlPQVnJS++8GBxI1rfM3 O5KECwD3TpG6MBPpnjMK8uWwWqIe2/CJ/gVpt/9kP4MNKf7T5BlXjmOZYgg8t+e7hzyo 1d3Kvb/vdy7Z+FoTnhSNvRCSzvOCXYMEPtztq+NUOFnRMBWI8BMpKk2TIhuLqb4mQ04N SA7kMTojvukBdoKa8fo4KR54IF7ft+ZQUuy8ffiZmPqK3YPamaQ/daEesRpzNTt3Nms/ 0jpoyeJdnN0hbAYDm4V53QKXxASNjIhFFsSFVigzFAJA6AcnXoNDj3XyxZrV1E5UjrOe 2Wyw== X-Gm-Message-State: AOAM532h3QharNeLuHmFr+TMYfhjTK03/gaQThluWLjKu0AP+omMD5QN 17wn/hbrsvLtU54YVtsHUaGTIJDa43Kw0bBuONM= X-Google-Smtp-Source: ABdhPJxS1cYLvTIq9AbU/WliPWkh+GMQ6EsM5q7afR6k6pEppCcn0hGMMeepAaLb0PMYcn/yVr6LGbihlfCH0HkjlAs= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a5b:486:: with SMTP id n6mr9292236ybp.229.1602260068556; Fri, 09 Oct 2020 09:14:28 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:33 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-25-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 24/29] arm64: disable recordmcount with DYNAMIC_FTRACE_WITH_REGS From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201009_171431_453124_AB1256CB X-CRM114-Status: GOOD ( 11.99 ) 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, 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 DYNAMIC_FTRACE_WITH_REGS uses -fpatchable-function-entry, which makes running recordmcount unnecessary as there are no mcount calls in object files, and __mcount_loc doesn't need to be generated. While there's normally no harm in running recordmcount even when it's not strictly needed, this won't work with LTO as we have LLVM bitcode instead of ELF objects. This change selects FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY, which disables recordmcount when patchable function entries are used instead. Signed-off-by: Sami Tolvanen --- arch/arm64/Kconfig | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6d232837cbee..ad522b021f35 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -155,6 +155,8 @@ config ARM64 select HAVE_DYNAMIC_FTRACE select HAVE_DYNAMIC_FTRACE_WITH_REGS \ if $(cc-option,-fpatchable-function-entry=2) + select FTRACE_MCOUNT_USE_PATCHABLE_FUNCTION_ENTRY \ + if DYNAMIC_FTRACE_WITH_REGS select HAVE_EFFICIENT_UNALIGNED_ACCESS select HAVE_FAST_GUP select HAVE_FTRACE_MCOUNT_RECORD -- 2.28.0.1011.ga647a8990f-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel