linux/arch/alpha/kernel/vmlinux.lds.S
Steven Rostedt a2d063ac21 extable, core_kernel_data(): Make sure all archs define _sdata
A new utility function (core_kernel_data()) is used to determine if a
passed in address is part of core kernel data or not. It may or may not
return true for RO data, but this utility must work for RW data.

Thus both _sdata and _edata must be defined and continuous,
without .init sections that may later be freed and replaced by
volatile memory (memory that can be freed).

This utility function is used to determine if data is safe from
ever being freed. Thus it should return true for all RW global
data that is not in a module or has been allocated, or false
otherwise.

Also change core_kernel_data() back to the more precise _sdata condition
and document the function.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Hirokazu Takata <takata@linux-m32r.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: linux-m68k@lists.linux-m68k.org
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Helge Deller <deller@gmx.de>
Cc: JamesE.J.Bottomley <jejb@parisc-linux.org>
Link: http://lkml.kernel.org/r/1305855298.1465.19.camel@gandalf.stny.rr.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
----
 arch/alpha/kernel/vmlinux.lds.S   |    1 +
 arch/m32r/kernel/vmlinux.lds.S    |    1 +
 arch/m68k/kernel/vmlinux-std.lds  |    2 ++
 arch/m68k/kernel/vmlinux-sun3.lds |    1 +
 arch/mips/kernel/vmlinux.lds.S    |    1 +
 arch/parisc/kernel/vmlinux.lds.S  |    3 +++
 kernel/extable.c                  |   12 +++++++++++-
 7 files changed, 20 insertions(+), 1 deletion(-)
2011-05-20 08:56:56 +02:00

76 lines
1.3 KiB
ArmAsm

#include <asm-generic/vmlinux.lds.h>
#include <asm/thread_info.h>
#include <asm/cache.h>
#include <asm/page.h>
OUTPUT_FORMAT("elf64-alpha")
OUTPUT_ARCH(alpha)
ENTRY(__start)
PHDRS { kernel PT_LOAD; note PT_NOTE; }
jiffies = jiffies_64;
SECTIONS
{
#ifdef CONFIG_ALPHA_LEGACY_START_ADDRESS
. = 0xfffffc0000310000;
#else
. = 0xfffffc0001010000;
#endif
_text = .; /* Text and read-only data */
.text : {
HEAD_TEXT
TEXT_TEXT
SCHED_TEXT
LOCK_TEXT
*(.fixup)
*(.gnu.warning)
} :kernel
_etext = .; /* End of text section */
NOTES :kernel :note
.dummy : {
*(.dummy)
} :kernel
RODATA
EXCEPTION_TABLE(16)
/* Will be freed after init */
__init_begin = ALIGN(PAGE_SIZE);
INIT_TEXT_SECTION(PAGE_SIZE)
INIT_DATA_SECTION(16)
PERCPU(L1_CACHE_BYTES, PAGE_SIZE)
/* Align to THREAD_SIZE rather than PAGE_SIZE here so any padding page
needed for the THREAD_SIZE aligned init_task gets freed after init */
. = ALIGN(THREAD_SIZE);
__init_end = .;
/* Freed after init ends here */
_sdata = .; /* Start of rw data section */
_data = .;
RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
.got : {
*(.got)
}
.sdata : {
*(.sdata)
}
_edata = .; /* End of data section */
BSS_SECTION(0, 0, 0)
_end = .;
.mdebug 0 : {
*(.mdebug)
}
.note 0 : {
*(.note)
}
STABS_DEBUG
DWARF_DEBUG
DISCARDS
}