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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=i0HfMD/wRChzzw+H0j5SIQI+XYlsyfomuEvjB0A2b7U=; b=Y73t2uoAIYlI+0GF8nA0owpOjuUH6uejWehXDuo9TRDmiz0s1dv8MzkCFsizq5qUnP ARFI81DJfOXsnfFs8TVy1FTv6IPF52jYLFUW3vXKUAo6vkOTgwhqBMRV4oM6Fis6/t8c b/CBmSzl83YL9iL3v2vF0QSCF8BN6NLwJsva+RYxaQoDRV6UQ5VyAEGvjUOX+OBCRX8w fENs97QAeisAfGxGwwHCOI7pmDTN72/JMXKH+InGGYFDIpTE59u6Ecmcau/k/hw04U1H mLWnB+e+xm/kLPxyY79WcVnM8PsKBach1+7uxwm2XKirHNoc5zGzZVT6TAry111jMqAx OV9w== X-Gm-Message-State: AOAM530sRKZF1RqZBP685LCbnywl2c7EUN+9R6KwVpbfvNZmTJ/ILpFP Ib1/6YQ7JTkVdWwr09GUS22GqDoL4LHJV1EJRmE= X-Google-Smtp-Source: ABdhPJyWpX0TYRebf3Rkf2Yh1c8ADAskEKEgvpC4cZTbopj2J6pmYFQCkigTg2srbz/p2P1Qt1W0jVbIt5KqdOEhaLA= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a25:cc89:: with SMTP id l131mr12649555ybf.154.1602549152704; Mon, 12 Oct 2020 17:32:32 -0700 (PDT) Date: Mon, 12 Oct 2020 17:31:51 -0700 In-Reply-To: <20201013003203.4168817-1-samitolvanen@google.com> Message-Id: <20201013003203.4168817-14-samitolvanen@google.com> Mime-Version: 1.0 References: <20201013003203.4168817-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v6 13/25] kbuild: lto: merge module sections From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201013_013240_419943_D23BF01A X-CRM114-Status: GOOD ( 11.93 ) 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, Will Deacon , 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 LLD always splits sections with LTO, which increases module sizes. This change adds linker script rules to merge the split sections in the final module. Suggested-by: Nick Desaulniers Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- scripts/module.lds.S | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/scripts/module.lds.S b/scripts/module.lds.S index 69b9b71a6a47..037120173a22 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -25,5 +25,33 @@ SECTIONS { __jump_table 0 : ALIGN(8) { KEEP(*(__jump_table)) } } +#ifdef CONFIG_LTO_CLANG +/* + * With CONFIG_LTO_CLANG, LLD always enables -fdata-sections and + * -ffunction-sections, which increases the size of the final module. + * Merge the split sections in the final binary. + */ +SECTIONS { + __patchable_function_entries : { *(__patchable_function_entries) } + + .bss : { + *(.bss .bss.[0-9a-zA-Z_]*) + *(.bss..L*) + } + + .data : { + *(.data .data.[0-9a-zA-Z_]*) + *(.data..L*) + } + + .rodata : { + *(.rodata .rodata.[0-9a-zA-Z_]*) + *(.rodata..L*) + } + + .text : { *(.text .text.[0-9a-zA-Z_]*) } +} +#endif + /* bring in arch-specific sections */ #include -- 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