Skip to content
  • Steven Rostedt's avatar
    extable, core_kernel_data(): Make sure all archs define _sdata · a2d063ac
    Steven Rostedt authored
    
    
    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: default avatarSteven Rostedt <rostedt@goodmis.org>
    Acked-by: default avatarRalf Baechle <ralf@linux-mips.org>
    Acked-by: default avatarHirokazu 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: default avatarIngo 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(-)
    a2d063ac