7798ed0f57
Today's linux-next build (powerpc allmodconfig) failed like this: ERROR: ".save_stack_trace" [tests/backtracetest.ko] undefined! But save_stack_trace is exported in arch/powerpc/kernel/stacktrace.c I couldn't figure it out until I noticed these earlier warnings: arch/powerpc/kernel/stacktrace.c:47: warning: data definition has no type or storage class arch/powerpc/kernel/stacktrace.c:47: warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL_GPL' arch/powerpc/kernel/stacktrace.c:47: warning: parameter names (without types) in function declaration I applied the patch below. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: <linuxppc-dev@ozlabs.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
49 lines
1.0 KiB
C
49 lines
1.0 KiB
C
/*
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* Stack trace utility
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*
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* Copyright 2008 Christoph Hellwig, IBM Corp.
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/sched.h>
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#include <linux/stacktrace.h>
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#include <linux/module.h>
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#include <asm/ptrace.h>
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/*
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* Save stack-backtrace addresses into a stack_trace buffer.
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*/
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void save_stack_trace(struct stack_trace *trace)
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{
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unsigned long sp;
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asm("mr %0,1" : "=r" (sp));
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for (;;) {
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unsigned long *stack = (unsigned long *) sp;
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unsigned long newsp, ip;
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if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))
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return;
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newsp = stack[0];
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ip = stack[STACK_FRAME_LR_SAVE];
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if (!trace->skip)
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trace->entries[trace->nr_entries++] = ip;
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else
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trace->skip--;
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if (trace->nr_entries >= trace->max_entries)
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return;
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sp = newsp;
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}
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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