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aedcfbe065
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>
28 lines
443 B
C
28 lines
443 B
C
#include <linux/module.h>
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#include "libgcc.h"
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word_type notrace __cmpdi2(long long a, long long b)
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{
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const DWunion au = {
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.ll = a
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};
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const DWunion bu = {
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.ll = b
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};
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if (au.s.high < bu.s.high)
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return 0;
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else if (au.s.high > bu.s.high)
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return 2;
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if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
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return 0;
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else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
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return 2;
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return 1;
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}
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EXPORT_SYMBOL(__cmpdi2);
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