From patchwork Wed Jan 20 09:05:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 60010 Delivered-To: patch@linaro.org Received: by 10.112.130.2 with SMTP id oa2csp3054936lbb; Wed, 20 Jan 2016 01:07:08 -0800 (PST) X-Received: by 10.98.72.132 with SMTP id q4mr50185467pfi.53.1453280828858; Wed, 20 Jan 2016 01:07:08 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id z88si53996198pfi.50.2016.01.20.01.07.08; Wed, 20 Jan 2016 01:07:08 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dkim=pass header.i=@linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934111AbcATJHD (ORCPT + 29 others); Wed, 20 Jan 2016 04:07:03 -0500 Received: from mail-wm0-f41.google.com ([74.125.82.41]:38650 "EHLO mail-wm0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758250AbcATJF4 (ORCPT ); Wed, 20 Jan 2016 04:05:56 -0500 Received: by mail-wm0-f41.google.com with SMTP id b14so17936939wmb.1 for ; Wed, 20 Jan 2016 01:05:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=J87a6KfXDIwzfy32lH1V4B4ud/ZmxRvWOTA+S5D7cP4=; b=KB1rIlmFAPzW9/j6za3IyOwf5RxPUojwxMzhw3JZEUCsrdj7gP7L7tHZUAH6PZoYGb oD+at3eJsHwgdSHNBavn85PmzvVtShHa+sDSvuEHk/ylCSTDJ7eQkuSg6llRwaUIE2jK it+0Y5QwPsnlV3aMUpmGsLCz3P4MfQIC8KlXE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=J87a6KfXDIwzfy32lH1V4B4ud/ZmxRvWOTA+S5D7cP4=; b=bzgA6xGffcOID2sBFu8e4MHEY9DLXbcXs79rwf+Yqd33IopnSXkuzbrX2vicxXqP1X 4MSZV/0IjCwixvO9ZalSkVl3W4v2nmly5dfJpgswDcfEboJh6Quxvqk/+RzjbCIuGQ9w cerA2deM4ZairTkzY9KerWZklNk80VSe4jrKd/Auni1M2JC60zFCqVxIIXpD/x9jZlxi qCOPgrQooTn7qO0hGDb7vNug/X7rOvqQFLMq0GKnX/btkPTEhaO1ienSiDmed+EpeWV1 uhpFIwS5OmOPLo40cSfZdqlAiYOWT/9ceIwRy4BLQiTXflOqh+oz1OAPXucb7rTMbyqy Nt3Q== X-Gm-Message-State: AG10YORsq+9rtgGEH17HpbZWXwcxm6L4H7y1xZV10JzrtCnkeNPHA9aIpJGrYqHUTzzG9tlk X-Received: by 10.28.4.145 with SMTP id 139mr2830557wme.56.1453280754975; Wed, 20 Jan 2016 01:05:54 -0800 (PST) Received: from localhost.localdomain (cag06-7-83-153-85-71.fbx.proxad.net. [83.153.85.71]) by smtp.gmail.com with ESMTPSA id k130sm24234780wmg.6.2016.01.20.01.05.53 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 20 Jan 2016 01:05:54 -0800 (PST) From: Ard Biesheuvel To: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, keescook@chromium.org, akpm@linux-foundation.org, mingo@kernel.org, hpa@zytor.com, heiko.carstens@de.ibm.com, benh@kernel.crashing.org, mpe@ellerman.id.au, mmarek@suse.cz, rusty@rustcorp.com.au Cc: Ard Biesheuvel Subject: [PATCH 2/4] powerpc: enable text relative kallsyms for ppc64 Date: Wed, 20 Jan 2016 10:05:36 +0100 Message-Id: <1453280738-18721-3-git-send-email-ard.biesheuvel@linaro.org> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1453280738-18721-1-git-send-email-ard.biesheuvel@linaro.org> References: <1453280738-18721-1-git-send-email-ard.biesheuvel@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This enables the newly introduced text-relative kallsyms support when building 64-bit targets. This cuts the size of the kallsyms address table in half, and drastically reduces the size of the PIE dynamic relocation section when building with CONFIG_RELOCATABLE=y (by about 3 MB for ppc64_defconfig) Signed-off-by: Ard Biesheuvel --- Results for ppc64_defconfig: BEFORE: -- 2.5.0 ======= $ size vmlinux text data bss dec hex filename 19827996 2008456 849612 22686064 15a2970 vmlinux $ readelf -S .tmp_kallsyms2.o There are 9 section headers, starting at offset 0x4513f8: Section Headers: [Nr] Name Type Address Offset Size EntSize Flags Link Info Align ... [ 4] .rodata PROGBITS 0000000000000000 00000100 00000000001fcf00 0000000000000000 A 0 0 256 [ 5] .rela.rodata RELA 0000000000000000 001fd1d8 0000000000254220 0000000000000018 I 7 4 8 [ 6] .shstrtab STRTAB 0000000000000000 001fd000 0000000000000039 0000000000000000 0 0 1 ... $ ls -l arch/powerpc/boot/zImage -rwxrwxr-x 2 ard ard 7533160 Jan 20 08:43 arch/powerpc/boot/zImage AFTER: ====== $ size vmlinux text data bss dec hex filename 16979516 2009992 849612 19839120 12eb890 vmlinux $ readelf -S .tmp_kallsyms2.o There are 8 section headers, starting at offset 0x199bb0: Section Headers: [Nr] Name Type Address Offset Size EntSize Flags Link Info Align ... [ 4] .rodata PROGBITS 0000000000000000 00000100 0000000000199900 0000000000000000 A 0 0 256 [ 5] .shstrtab STRTAB 0000000000000000 00199a00 0000000000000034 0000000000000000 0 0 1 ... $ ls -l arch/powerpc/boot/zImage -rwxrwxr-x 2 ard ard 6985672 Jan 20 08:45 arch/powerpc/boot/zImage --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 94f6c5089e0c..d1c26749632b 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -158,6 +158,7 @@ config PPC select ARCH_HAS_DMA_SET_COHERENT_MASK select ARCH_HAS_DEVMEM_IS_ALLOWED select HAVE_ARCH_SECCOMP_FILTER + select KALLSYMS_TEXT_RELATIVE if PPC64 config GENERIC_CSUM def_bool CPU_LITTLE_ENDIAN