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

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: default 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

arch/mips/lib/ashldi3.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

arch/mips/lib/ashrdi3.c

+1 −1
Original line number Diff line number Diff line
@@ -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;

arch/mips/lib/bswapdi.c

+1 −1
Original line number Diff line number Diff line 
#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) |

arch/mips/lib/bswapsi.c

+1 −1
Original line number Diff line number Diff line 
#include <linux/module.h>



unsigned int __bswapsi2(unsigned int u)

unsigned int notrace __bswapsi2(unsigned int u)

{

	return (((u) & 0xff000000) >> 24) |

	       (((u) & 0x00ff0000) >>  8) |

arch/mips/lib/cmpdi2.c

+1 −1
Original line number Diff line number Diff line
@@ -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

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