releases/4.8.5/parisc-fix-kernel-memory-layout-regarding-position-of-__gp.patch

   1 From f8850abb7ba68229838014b3409460e576751c6d Mon Sep 17 00:00:00 2001
   2 From: Helge Deller <deller@gmx.de>
   3 Date: Sun, 9 Oct 2016 11:12:34 +0200
   4 Subject: parisc: Fix kernel memory layout regarding position of __gp
   5
   6 From: Helge Deller <deller@gmx.de>
   7
   8 commit f8850abb7ba68229838014b3409460e576751c6d upstream.
   9
  10 Architecturally we need to keep __gp below 0x1000000.
  11
  12 But because of ftrace and tracepoint support, the RO_DATA_SECTION now gets much
  13 bigger than it was before. By moving the linkage tables before RO_DATA_SECTION
  14 we can avoid that __gp gets positioned at a too high address.
  15
  16 Signed-off-by: Helge Deller <deller@gmx.de>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  arch/parisc/kernel/vmlinux.lds.S |    7 +++++--
  21  1 file changed, 5 insertions(+), 2 deletions(-)
  22
  23 --- a/arch/parisc/kernel/vmlinux.lds.S
  24 +++ b/arch/parisc/kernel/vmlinux.lds.S
  25 @@ -89,8 +89,9 @@ SECTIONS
  26         /* Start of data section */
  27         _sdata = .;
  28
  29 -       RO_DATA_SECTION(8)
  30 -
  31 +       /* Architecturally we need to keep __gp below 0x1000000 and thus
  32 +        * in front of RO_DATA_SECTION() which stores lots of tracepoint
  33 +        * and ftrace symbols. */
  34  #ifdef CONFIG_64BIT
  35         . = ALIGN(16);
  36         /* Linkage tables */
  37 @@ -105,6 +106,8 @@ SECTIONS
  38         }
  39  #endif
  40
  41 +       RO_DATA_SECTION(8)
  42 +
  43         /* unwind info */
  44         .PARISC.unwind : {
  45                 __start___unwind = .;