forked from Minki/linux
a2d063ac21
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(-)
76 lines
1.3 KiB
ArmAsm
76 lines
1.3 KiB
ArmAsm
#include <asm-generic/vmlinux.lds.h>
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#include <asm/thread_info.h>
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#include <asm/cache.h>
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#include <asm/page.h>
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OUTPUT_FORMAT("elf64-alpha")
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OUTPUT_ARCH(alpha)
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ENTRY(__start)
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PHDRS { kernel PT_LOAD; note PT_NOTE; }
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jiffies = jiffies_64;
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SECTIONS
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{
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#ifdef CONFIG_ALPHA_LEGACY_START_ADDRESS
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. = 0xfffffc0000310000;
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#else
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. = 0xfffffc0001010000;
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#endif
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_text = .; /* Text and read-only data */
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.text : {
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HEAD_TEXT
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TEXT_TEXT
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SCHED_TEXT
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LOCK_TEXT
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*(.fixup)
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*(.gnu.warning)
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} :kernel
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_etext = .; /* End of text section */
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NOTES :kernel :note
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.dummy : {
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*(.dummy)
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} :kernel
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RODATA
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EXCEPTION_TABLE(16)
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/* Will be freed after init */
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__init_begin = ALIGN(PAGE_SIZE);
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INIT_TEXT_SECTION(PAGE_SIZE)
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INIT_DATA_SECTION(16)
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PERCPU(L1_CACHE_BYTES, PAGE_SIZE)
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/* Align to THREAD_SIZE rather than PAGE_SIZE here so any padding page
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needed for the THREAD_SIZE aligned init_task gets freed after init */
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. = ALIGN(THREAD_SIZE);
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__init_end = .;
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/* Freed after init ends here */
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_sdata = .; /* Start of rw data section */
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_data = .;
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RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
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.got : {
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*(.got)
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}
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.sdata : {
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*(.sdata)
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}
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_edata = .; /* End of data section */
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BSS_SECTION(0, 0, 0)
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_end = .;
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.mdebug 0 : {
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*(.mdebug)
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}
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.note 0 : {
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*(.note)
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}
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STABS_DEBUG
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DWARF_DEBUG
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DISCARDS
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}
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