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[83.153.85.71]) by smtp.gmail.com with ESMTPSA id k130sm24234780wmg.6.2016.01.20.01.05.55 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 20 Jan 2016 01:05:56 -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 3/4] s390: enable text relative kallsyms for 64-bit targets Date: Wed, 20 Jan 2016 10:05:37 +0100 Message-Id: <1453280738-18721-4-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, reducing the memory footprint of the kernel .rodata section by about 250 KB for a defconfig build. Signed-off-by: Ard Biesheuvel --- BEFORE: -- 2.5.0 ======= $ size vmlinux text data bss dec hex filename 12329586 3107008 14727792 30164386 1cc45a2 vmlinux $ readelf -S .tmp_kallsyms2.o There are 9 section headers, starting at offset 0x125b50: Section Headers: [Nr] Name Type Address Offset Size EntSize Flags Link Info Align ... [ 4] .rodata PROGBITS 0000000000000000 00000040 0000000000125ad0 0000000000000000 A 0 0 8 [ 5] .rela.rodata RELA 0000000000000000 00125f28 000000000015ead8 0000000000000018 7 4 8 [ 6] .shstrtab STRTAB 0000000000000000 00125b10 0000000000000039 0000000000000000 0 0 1 ... $ ls -l arch/s390/boot/bzImage -rwxrwxr-x 1 ard ard 5234224 Jan 20 08:22 arch/s390/boot/bzImage AFTER: ====== $ size vmlinux text data bss dec hex filename 12088114 3102912 14727792 29918818 1c88662 vmlinux $ readelf -S .tmp_kallsyms2.o There are 8 section headers, starting at offset 0xeb428: Section Headers: [Nr] Name Type Address Offset ... [ 4] .rodata PROGBITS 0000000000000000 00000040 00000000000eb3b0 0000000000000000 A 0 0 8 [ 5] .shstrtab STRTAB 0000000000000000 000eb3f0 0000000000000034 0000000000000000 0 0 1 ... $ ls -l arch/s390/boot/bzImage -rwxrwxr-x 1 ard ard 5224256 Jan 20 08:23 arch/s390/boot/bzImage --- arch/s390/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index dbeeb3a049f2..588160fd1db0 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -149,6 +149,7 @@ config S390 select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING + select KALLSYMS_TEXT_RELATIVE if 64BIT select MODULES_USE_ELF_RELA select NO_BOOTMEM select OLD_SIGACTION