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https://github.com/edk2-porting/linux-next.git
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b17b01533b
We are going to split <linux/sched/debug.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/debug.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
87 lines
2.0 KiB
C
87 lines
2.0 KiB
C
#include <linux/sched.h>
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#include <linux/sched/debug.h>
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#include <linux/stacktrace.h>
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#include <linux/thread_info.h>
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#include <linux/ftrace.h>
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#include <linux/export.h>
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#include <asm/ptrace.h>
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#include <asm/stacktrace.h>
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#include "kstack.h"
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static void __save_stack_trace(struct thread_info *tp,
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struct stack_trace *trace,
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bool skip_sched)
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{
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unsigned long ksp, fp;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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struct task_struct *t;
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int graph = 0;
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#endif
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if (tp == current_thread_info()) {
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stack_trace_flush();
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__asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
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} else {
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ksp = tp->ksp;
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}
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fp = ksp + STACK_BIAS;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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t = tp->task;
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#endif
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do {
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struct sparc_stackf *sf;
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struct pt_regs *regs;
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unsigned long pc;
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if (!kstack_valid(tp, fp))
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break;
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sf = (struct sparc_stackf *) fp;
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regs = (struct pt_regs *) (sf + 1);
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if (kstack_is_trap_frame(tp, regs)) {
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if (!(regs->tstate & TSTATE_PRIV))
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break;
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pc = regs->tpc;
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fp = regs->u_regs[UREG_I6] + STACK_BIAS;
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} else {
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pc = sf->callers_pc;
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fp = (unsigned long)sf->fp + STACK_BIAS;
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}
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if (trace->skip > 0)
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trace->skip--;
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else if (!skip_sched || !in_sched_functions(pc)) {
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trace->entries[trace->nr_entries++] = pc;
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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if ((pc + 8UL) == (unsigned long) &return_to_handler) {
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int index = t->curr_ret_stack;
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if (t->ret_stack && index >= graph) {
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pc = t->ret_stack[index - graph].ret;
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if (trace->nr_entries <
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trace->max_entries)
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trace->entries[trace->nr_entries++] = pc;
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graph++;
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}
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}
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#endif
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}
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} while (trace->nr_entries < trace->max_entries);
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}
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void save_stack_trace(struct stack_trace *trace)
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{
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__save_stack_trace(current_thread_info(), trace, false);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace);
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void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
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{
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struct thread_info *tp = task_thread_info(tsk);
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__save_stack_trace(tp, trace, true);
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}
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EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
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