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MIPS: lib: Mark intrinsics notrace 

On certain MIPS32 devices, the ftrace tracer "function_graph" uses
__lshrdi3() during the capturing of trace data. ftrace then attempts to
trace __lshrdi3() which leads to infinite recursion and a stack overflow.
Fix this by marking __lshrdi3() as notrace. Mark the other compiler
intrinsics as notrace in case the compiler decides to use them in the
ftrace path.

Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com>
Cc: <linux-mips@linux-mips.org>
Cc: <linux-kernel@vger.kernel.org>
Cc: <stable@vger.kernel.org> # 4.2.x-
Patchwork: https://patchwork.linux-mips.org/patch/13354/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
hifive-unleashed-5.1
Harvey Hunt 2016-05-25 11:06:35 +01:00 committed by Ralf Baechle
parent aa76042a01
commit aedcfbe065
7 changed files with 7 additions and 7 deletions
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2
arch/mips/lib/ashldi3.c
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@ -2,7 +2,7 @@
#include "libgcc.h"
long long __ashldi3(long long u, word_type b)
long long notrace __ashldi3(long long u, word_type b)
{
DWunion uu, w;
word_type bm;

2
arch/mips/lib/ashrdi3.c
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@ -2,7 +2,7 @@
#include "libgcc.h"
long long __ashrdi3(long long u, word_type b)
long long notrace __ashrdi3(long long u, word_type b)
{
DWunion uu, w;
word_type bm;

2
arch/mips/lib/bswapdi.c
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@ -1,6 +1,6 @@
#include <linux/module.h>
unsigned long long __bswapdi2(unsigned long long u)
unsigned long long notrace __bswapdi2(unsigned long long u)
{
return (((u) & 0xff00000000000000ull) >> 56) |
(((u) & 0x00ff000000000000ull) >> 40) |

2
arch/mips/lib/bswapsi.c
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@ -1,6 +1,6 @@
#include <linux/module.h>
unsigned int __bswapsi2(unsigned int u)
unsigned int notrace __bswapsi2(unsigned int u)
{
return (((u) & 0xff000000) >> 24) |
(((u) & 0x00ff0000) >> 8) |

2
arch/mips/lib/cmpdi2.c
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@ -2,7 +2,7 @@
#include "libgcc.h"
word_type __cmpdi2(long long a, long long b)
word_type notrace __cmpdi2(long long a, long long b)
{
const DWunion au = {
.ll = a

2
arch/mips/lib/lshrdi3.c
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@ -2,7 +2,7 @@
#include "libgcc.h"
long long __lshrdi3(long long u, word_type b)
long long notrace __lshrdi3(long long u, word_type b)
{
DWunion uu, w;
word_type bm;

2
arch/mips/lib/ucmpdi2.c
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@ -2,7 +2,7 @@
#include "libgcc.h"
word_type __ucmpdi2(unsigned long long a, unsigned long long b)
word_type notrace __ucmpdi2(unsigned long long a, unsigned long long b)
{
const DWunion au = {.ll = a};
const DWunion bu = {.ll = b};