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| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-01-30 13:32:50 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:32:50 +0100 |
| commit | 4c4915627f94a81a834a7a65dee83acdfb45788c (patch) | |
| tree | 1b0aff455fb7379fe4a8528828ddecfa20bca491 | |
| parent | 0c2bd5a5e3b9469c6ab2b96c403980f192db0bf7 (diff) | |
| download | blackbird-op-linux-4c4915627f94a81a834a7a65dee83acdfb45788c.tar.gz blackbird-op-linux-4c4915627f94a81a834a7a65dee83acdfb45788c.zip | |
x86: make arch/x86/kernel/acpi/wakeup_32.S use a separate
While examining vmlinux namelist on i386 (nm -v vmlinux) I noticed :
c01021d0 t es7000_rename_gsi
c010221a T es7000_start_cpu
<Big Hole>
c0103000 T thread_saved_pc
and
c0113218 T acpi_restore_state_mem
c0113219 T acpi_save_state_mem
<Big Hole>
c0114000 t wakeup_code
This is because arch/x86/kernel/acpi/wakeup_32.S forces a .text alignment
of 4096 bytes. (I have no idea if it is really needed, since
arch/x86/kernel/acpi/wakeup_64.S uses a 16 bytes alignment *only*)
So arch/x86/kernel/built-in.o also has this alignment
arch/x86/kernel/built-in.o: file format elf32-i386
Sections:
Idx Name Size VMA LMA File off Algn
0 .text 00018c94 00000000 00000000 00001000 2**12
CONTENTS, ALLOC, LOAD, RELOC, READONLY, CODE
But as arch/x86/kernel/acpi/wakeup_32.o is not the first object linked
into arch/x86/kernel/built-in.o, linker had to build several holes to meet
alignement requirements, because of .o nestings in the kbuild process.
This can be solved by using a special section, .text.page_aligned, so that
no holes are needed.
# size vmlinux.before vmlinux.after
text data bss dec hex filename
4619942 422838 458752 5501532 53f25c vmlinux.before
4610534 422838 458752 5492124 53cd9c vmlinux.after
This saves 9408 bytes
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | arch/x86/kernel/acpi/wakeup_32.S | 2 | ||||
| -rw-r--r-- | arch/x86/kernel/vmlinux_32.lds.S | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/acpi/wakeup_32.S b/arch/x86/kernel/acpi/wakeup_32.S index 1e931aaf2ef6..f53e3277f8e5 100644 --- a/arch/x86/kernel/acpi/wakeup_32.S +++ b/arch/x86/kernel/acpi/wakeup_32.S @@ -1,4 +1,4 @@ -.text + .section .text.page_aligned #include <linux/linkage.h> #include <asm/segment.h> #include <asm/page.h> diff --git a/arch/x86/kernel/vmlinux_32.lds.S b/arch/x86/kernel/vmlinux_32.lds.S index ec072588ff01..f1148ac8abe3 100644 --- a/arch/x86/kernel/vmlinux_32.lds.S +++ b/arch/x86/kernel/vmlinux_32.lds.S @@ -38,6 +38,8 @@ SECTIONS /* read-only */ .text : AT(ADDR(.text) - LOAD_OFFSET) { + . = ALIGN(4096); /* not really needed, already page aligned */ + *(.text.page_aligned) TEXT_TEXT SCHED_TEXT LOCK_TEXT |
