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(-)
55 lines
1 KiB
Text
55 lines
1 KiB
Text
/* ld script to make m68k Linux kernel */
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#include <asm-generic/vmlinux.lds.h>
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#include <asm/page.h>
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#include <asm/thread_info.h>
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OUTPUT_FORMAT("elf32-m68k", "elf32-m68k", "elf32-m68k")
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OUTPUT_ARCH(m68k)
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ENTRY(_start)
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jiffies = jiffies_64 + 4;
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SECTIONS
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{
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. = 0xE002000;
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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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} :text = 0x4e75
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RODATA
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_etext = .; /* End of text section */
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EXCEPTION_TABLE(16) :data
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_sdata = .; /* Start of rw data section */
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RW_DATA_SECTION(16, PAGE_SIZE, THREAD_SIZE) :data
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/* End of data goes *here* so that freeing init code works properly. */
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_edata = .;
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NOTES
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/* will be freed after init */
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. = ALIGN(PAGE_SIZE); /* Init code and data */
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__init_begin = .;
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INIT_TEXT_SECTION(PAGE_SIZE)
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INIT_DATA_SECTION(16)
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.m68k_fixup : {
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__start_fixup = .;
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*(.m68k_fixup)
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__stop_fixup = .;
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}
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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BSS_SECTION(0, 0, 0)
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_end = . ;
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STABS_DEBUG
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/* Sections to be discarded */
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DISCARDS
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}
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