Patch "powerpc/64: Fix flush_(d|i)cache_range() called from modules" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    powerpc/64: Fix flush_(d|i)cache_range() called from modules

to the 4.4-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:
     powerpc-64-fix-flush_-d-i-cache_range-called-from-modules.patch
and it can be found in the queue-4.4 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 8f5f525d5b83f7d76a6baf9c4e94d4bf312ea7f6 Mon Sep 17 00:00:00 2001
From: Oliver O'Halloran <oohall@gmail.com>
Date: Mon, 3 Apr 2017 13:25:12 +1000
Subject: powerpc/64: Fix flush_(d|i)cache_range() called from modules

From: Oliver O'Halloran <oohall@gmail.com>

commit 8f5f525d5b83f7d76a6baf9c4e94d4bf312ea7f6 upstream.

When the kernel is compiled to use 64bit ABIv2 the _GLOBAL() macro does
not include a global entry point. A function's global entry point is
used when the function is called from a different TOC context and in the
kernel this typically means a call from a module into the vmlinux (or
vice-versa).

There are a few exported asm functions declared with _GLOBAL() and
calling them from a module will likely crash the kernel since any TOC
relative load will yield garbage.

flush_icache_range() and flush_dcache_range() are both exported to
modules, and use the TOC, so must use _GLOBAL_TOC().

Fixes: 721aeaa9fdf3 ("powerpc: Build little endian ppc64 kernel with ABIv2")
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/include/asm/ppc_asm.h |   12 ++++++++++++
 arch/powerpc/kernel/misc_64.S      |    4 ++--
 2 files changed, 14 insertions(+), 2 deletions(-)

--- a/arch/powerpc/include/asm/ppc_asm.h
+++ b/arch/powerpc/include/asm/ppc_asm.h
@@ -224,6 +224,16 @@ name: \
 	.globl name; \
 name:
 
+#define _KPROBE_TOC(name)			\
+	.section ".kprobes.text","a";		\
+	.align 2 ;				\
+	.type name,@function;			\
+	.globl name;				\
+name:						\
+0:	addis r2,r12,(.TOC.-0b)@ha;		\
+	addi r2,r2,(.TOC.-0b)@l;		\
+	.localentry name,.-name
+
 #define DOTSYM(a)	a
 
 #else
@@ -261,6 +271,8 @@ name: \
 	.type GLUE(.,name),@function; \
 GLUE(.,name):
 
+#define _KPROBE_TOC(n)	_KPROBE(n)
+
 #define DOTSYM(a)	GLUE(.,a)
 
 #endif
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -66,7 +66,7 @@ PPC64_CACHES:
  *   flush all bytes from start through stop-1 inclusive
  */
 
-_KPROBE(flush_icache_range)
+_KPROBE_TOC(flush_icache_range)
 BEGIN_FTR_SECTION
 	PURGE_PREFETCHED_INS
 	blr
@@ -117,7 +117,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_I
  *
  *    flush all bytes from start to stop-1 inclusive
  */
-_GLOBAL(flush_dcache_range)
+_GLOBAL_TOC(flush_dcache_range)
 
 /*
  * Flush the data cache to memory 


Patches currently in stable-queue which might be from oohall@gmail.com are

queue-4.4/powerpc-64-fix-flush_-d-i-cache_range-called-from-modules.patch
queue-4.4/powerpc-powernv-check-device-tree-for-rfi-flush-settings.patch