From: ebiederm@xmission.com (Eric W. Biederman)
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Tejun Heo <tj@kernel.org>, hacklu <embedway.linux@gmail.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 4/4] x86 boot: Tell ld the kernel doesn't want 2MB file offset alignment.
Date: Sun, 08 Jul 2012 23:56:17 -0700 [thread overview]
Message-ID: <871ukl5soe.fsf_-_@xmission.com> (raw)
In-Reply-To: <87fw915sv4.fsf_-_@xmission.com> (Eric W. Biederman's message of "Sun, 08 Jul 2012 23:52:15 -0700")
By default ld uses 2MB pages and aligns our 3 program segments in the
file on 2MB boundaries, creating unnecessarily large uncompressed
vmlinux files.
Solve this by passing -z max-page-size 4096 to ld.
In my test x86_64 SMP test configuration with CONFIG_DEBUG_RODATA
enabled, this reduces the size of vmlinux by roughly 5MB from 15141772
bytes to 10210188 bytes.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
arch/x86/Makefile | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 1f25214..b5b31c3 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -120,7 +120,7 @@ avx_instr := $(call as-instr,vxorps %ymm0$(comma)%ymm1$(comma)%ymm2,-DCONFIG_AS_
KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr) $(avx_instr)
-LDFLAGS := -m elf_$(UTS_MACHINE)
+LDFLAGS := -m elf_$(UTS_MACHINE) -z max-page-size=4096
# Speed up the build
KBUILD_CFLAGS += -pipe
--
1.7.5.4
next prev parent reply other threads:[~2012-07-09 6:56 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-17 5:56 why the decompressed procedure move kernel from address 0x100000(1M) to 0x1000000(16M) +x hacklu
2012-06-02 23:48 ` Eric W. Biederman
2012-06-03 3:10 ` H. Peter Anvin
2012-06-03 8:41 ` Eric W. Biederman
2012-06-03 13:01 ` H. Peter Anvin
2012-06-03 20:30 ` [PATCH 1/2] x86, boot: Don't overlap the compressed and non-compressed image Eric W. Biederman
2012-06-03 20:32 ` [PATCH 2/2] x86, boot: Optimize the elf header handling Eric W. Biederman
2012-07-01 14:56 ` [tip:x86/boot] " tip-bot for Eric W. Biederman
2012-07-01 15:04 ` [PATCH 2/2] " H. Peter Anvin
2012-07-01 15:34 ` H. Peter Anvin
2012-07-01 16:08 ` Eric W. Biederman
2012-07-01 16:11 ` H. Peter Anvin
2012-07-01 16:26 ` Eric W. Biederman
2012-07-01 16:44 ` H. Peter Anvin
2012-07-01 17:09 ` Eric W. Biederman
2012-07-01 17:15 ` H. Peter Anvin
2012-07-01 18:25 ` Eric W. Biederman
2012-07-01 18:37 ` H. Peter Anvin
2012-07-01 19:20 ` Eric W. Biederman
2012-07-01 19:23 ` H. Peter Anvin
2012-07-01 20:40 ` Eric W. Biederman
2012-07-01 20:52 ` H. Peter Anvin
2012-07-09 6:50 ` Eric W. Biederman
2012-07-09 6:52 ` [PATCH 1/4] x86 boot: Jump to the entry point address in the elf header Eric W. Biederman
2012-07-09 6:53 ` [PATCH 2/4] x86 boot: Optimize the elf header handling Eric W. Biederman
2012-07-09 6:55 ` [PATCH 3/4] x86 boot: When building vmlinux.bin properly precompute the memory image Eric W. Biederman
2012-07-09 6:56 ` Eric W. Biederman [this message]
2012-07-09 6:59 ` [PATCH 1/4] x86 boot: Jump to the entry point address in the elf header Eric W. Biederman
2012-07-02 16:56 ` [PATCH 2/2] x86, boot: Optimize the elf header handling Tejun Heo
2012-07-09 7:03 ` Eric W. Biederman
2012-07-01 2:23 ` [PATCH 1/2] x86, boot: Don't overlap the compressed and non-compressed image Eric W. Biederman
2012-07-01 2:32 ` H. Peter Anvin
2012-07-01 5:22 ` Eric W. Biederman
2012-07-01 14:55 ` [tip:x86/boot] x86, boot: Don' t " tip-bot for Eric W. Biederman
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