linker script: throw away .discard section

x86 throws away .discard section but no other archs do.  Also,
.discard is not thrown away while linking modules.  Make every arch
and module linking throw it away.  This will be used to define dummy
variables for percpu declarations and definitions.

This patch is based on Ivan Kokshaysky's alpha percpu patch.

[ Impact: always throw away everything in .discard ]

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Bryan Wu <cooloney@kernel.org>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Tejun Heo 2009-06-24 15:13:38 +09:00
parent e74e396204
commit 405d967dc7
26 changed files with 44 additions and 1 deletions

View file

@ -327,7 +327,7 @@ CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
MODFLAGS = -DMODULE MODFLAGS = -DMODULE
CFLAGS_MODULE = $(MODFLAGS) CFLAGS_MODULE = $(MODFLAGS)
AFLAGS_MODULE = $(MODFLAGS) AFLAGS_MODULE = $(MODFLAGS)
LDFLAGS_MODULE = LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
CFLAGS_KERNEL = CFLAGS_KERNEL =
AFLAGS_KERNEL = AFLAGS_KERNEL =
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage CFLAGS_GCOV = -fprofile-arcs -ftest-coverage

View file

@ -139,6 +139,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
.mdebug 0 : { .mdebug 0 : {

View file

@ -82,6 +82,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
*(.ARM.exidx.exit.text) *(.ARM.exidx.exit.text)
*(.ARM.extab.exit.text) *(.ARM.extab.exit.text)
#ifndef CONFIG_MMU #ifndef CONFIG_MMU

View file

@ -131,6 +131,7 @@ SECTIONS
/DISCARD/ : { /DISCARD/ : {
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
DWARF_DEBUG DWARF_DEBUG

View file

@ -280,5 +280,6 @@ SECTIONS
/DISCARD/ : /DISCARD/ :
{ {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
} }

View file

@ -145,6 +145,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
dram_end = dram_start + (CONFIG_ETRAX_DRAM_SIZE - __CONFIG_ETRAX_VMEM_SIZE)*1024*1024; dram_end = dram_start + (CONFIG_ETRAX_DRAM_SIZE - __CONFIG_ETRAX_VMEM_SIZE)*1024*1024;

View file

@ -177,6 +177,8 @@ SECTIONS
.debug_ranges 0 : { *(.debug_ranges) } .debug_ranges 0 : { *(.debug_ranges) }
.comment 0 : { *(.comment) } .comment 0 : { *(.comment) }
/DISCARD/ : { *(.discard) }
} }
__kernel_image_size_no_bss = __bss_start - __kernel_image_start; __kernel_image_size_no_bss = __bss_start - __kernel_image_start;

View file

@ -154,6 +154,7 @@ SECTIONS
} }
/DISCARD/ : { /DISCARD/ : {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
.romfs : .romfs :
{ {

View file

@ -29,6 +29,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
*(.IA_64.unwind.exit.text) *(.IA_64.unwind.exit.text)
*(.IA_64.unwind_info.exit.text) *(.IA_64.unwind_info.exit.text)
} }

View file

@ -125,6 +125,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
/* Stabs debugging sections. */ /* Stabs debugging sections. */

View file

@ -87,6 +87,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
/* Stabs debugging sections. */ /* Stabs debugging sections. */

View file

@ -82,6 +82,7 @@ __init_begin = .;
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
.crap : { .crap : {

View file

@ -188,6 +188,7 @@ SECTIONS {
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
.bss : { .bss : {

View file

@ -162,4 +162,6 @@ SECTIONS {
} }
. = ALIGN(4096); . = ALIGN(4096);
_end = .; _end = .;
/DISCARD/ : { *(.discard) }
} }

View file

@ -179,6 +179,7 @@ SECTIONS
/* Sections to be discarded */ /* Sections to be discarded */
/DISCARD/ : { /DISCARD/ : {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
/* ABI crap starts here */ /* ABI crap starts here */
*(.MIPS.options) *(.MIPS.options)

View file

@ -146,6 +146,7 @@ SECTIONS
/* Sections to be discarded */ /* Sections to be discarded */
/DISCARD/ : { /DISCARD/ : {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
STABS_DEBUG STABS_DEBUG

View file

@ -240,6 +240,7 @@ SECTIONS
/* Sections to be discarded */ /* Sections to be discarded */
/DISCARD/ : { /DISCARD/ : {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
#ifdef CONFIG_64BIT #ifdef CONFIG_64BIT
/* temporary hack until binutils is fixed to not emit these /* temporary hack until binutils is fixed to not emit these
* for static binaries * for static binaries

View file

@ -40,6 +40,7 @@ SECTIONS
/* Sections to be discarded. */ /* Sections to be discarded. */
/DISCARD/ : { /DISCARD/ : {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
EXIT_DATA EXIT_DATA
} }

View file

@ -161,6 +161,7 @@ SECTIONS
/DISCARD/ : { /DISCARD/ : {
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
/* Debugging sections. */ /* Debugging sections. */

View file

@ -171,6 +171,7 @@ SECTIONS
*/ */
/DISCARD/ : { /DISCARD/ : {
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
STABS_DEBUG STABS_DEBUG

View file

@ -175,6 +175,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
STABS_DEBUG STABS_DEBUG

View file

@ -156,4 +156,6 @@ SECTIONS
STABS_DEBUG STABS_DEBUG
DWARF_DEBUG DWARF_DEBUG
/DISCARD/ : { *(.discard) }
} }

View file

@ -100,4 +100,6 @@ SECTIONS
STABS_DEBUG STABS_DEBUG
DWARF_DEBUG DWARF_DEBUG
/DISCARD/ : { *(.discard) }
} }

View file

@ -287,6 +287,7 @@ SECTIONS
EXIT_TEXT EXIT_TEXT
EXIT_DATA EXIT_DATA
*(.exitcall.exit) *(.exitcall.exit)
*(.discard)
} }
.xt.lit : { *(.xt.lit) } .xt.lit : { *(.xt.lit) }

View file

@ -628,6 +628,14 @@
#define INITRAMFS #define INITRAMFS
#endif #endif
#define DISCARDS \
/DISCARD/ : { \
EXIT_TEXT \
EXIT_DATA \
*(.exitcall.exit) \
*(.discard) \
}
/** /**
* PERCPU_VADDR - define output section for percpu area * PERCPU_VADDR - define output section for percpu area
* @vaddr: explicit base address (optional) * @vaddr: explicit base address (optional)

View file

@ -0,0 +1,8 @@
/*
* Common module linker script, always used when linking a module.
* Archs are free to supply their own linker scripts. ld will
* combine them automatically.
*/
SECTIONS {
/DISCARD/ : { *(.discard) }
}