Commit aedcfbe0 authored by Harvey Hunt's avatar Harvey Hunt Committed by Ralf Baechle

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's avatarHarvey 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: default avatarRalf Baechle <ralf@linux-mips.org>
parent aa76042a
......@@ -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;
......
......@@ -2,7 +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;
......
#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) |
......
#include <linux/module.h>
unsigned int __bswapsi2(unsigned int u)
unsigned int notrace __bswapsi2(unsigned int u)
{
return (((u) & 0xff000000) >> 24) |
(((u) & 0x00ff0000) >> 8) |
......
......@@ -2,7 +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
......
......@@ -2,7 +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;
......
......@@ -2,7 +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};
......
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