Patch "parisc: Fix kernel memory layout regarding position of __gp" has been added to the 4.8-stable tree

Patch "parisc: Fix kernel memory layout regarding position of __gp" has been added to the 4.8-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    parisc: Fix kernel memory layout regarding position of __gp

to the 4.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     parisc-fix-kernel-memory-layout-regarding-position-of-__gp.patch
and it can be found in the queue-4.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From f8850abb7ba68229838014b3409460e576751c6d Mon Sep 17 00:00:00 2001
From: Helge Deller <deller@gmx.de>
Date: Sun, 9 Oct 2016 11:12:34 +0200
Subject: parisc: Fix kernel memory layout regarding position of __gp

From: Helge Deller <deller@gmx.de>

commit f8850abb7ba68229838014b3409460e576751c6d upstream.

Architecturally we need to keep __gp below 0x1000000.

But because of ftrace and tracepoint support, the RO_DATA_SECTION now gets much
bigger than it was before. By moving the linkage tables before RO_DATA_SECTION
we can avoid that __gp gets positioned at a too high address.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/parisc/kernel/vmlinux.lds.S |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -89,8 +89,9 @@ SECTIONS
 	/* Start of data section */
 	_sdata = .;
 
-	RO_DATA_SECTION(8)
-
+	/* Architecturally we need to keep __gp below 0x1000000 and thus
+	 * in front of RO_DATA_SECTION() which stores lots of tracepoint
+	 * and ftrace symbols. */
 #ifdef CONFIG_64BIT
 	. = ALIGN(16);
 	/* Linkage tables */
@@ -105,6 +106,8 @@ SECTIONS
 	}
 #endif
 
+	RO_DATA_SECTION(8)
+
 	/* unwind info */
 	.PARISC.unwind : {
 		__start___unwind = .;


Patches currently in stable-queue which might be from deller@gmx.de are

queue-4.8/parisc-fix-kernel-memory-layout-regarding-position-of-__gp.patch
queue-4.8/parisc-increase-initial-kernel-mapping-size.patch
queue-4.8/parisc-increase-kernel_initial_size-for-32-bit-smp-kernels.patch
queue-4.8/parisc-fix-self-detected-cpu-stall-warnings-on-mako-machines.patch