Commit-ID: 49a612c6b06defbd6e6d334c683fea28006728e3 Gitweb: http://git.kernel.org/tip/49a612c6b06defbd6e6d334c683fea28006728e3 Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> AuthorDate: Fri, 16 Sep 2016 14:18:14 -0500 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Tue, 20 Sep 2016 08:29:33 +0200 x86/stacktrace: Convert save_stack_trace_*() to use the new unwinder Convert save_stack_trace_*() to use the new unwinder. dump_trace() has been deprecated. Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxx> Cc: Borislav Petkov <bp@xxxxxxxxx> Cc: Brian Gerst <brgerst@xxxxxxxxx> Cc: Byungchul Park <byungchul.park@xxxxxxx> Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: H. Peter Anvin <hpa@xxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Nilay Vaish <nilayvaish@xxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/815494c627d89887db0ce56ceffd58ad16ee6c21.1474045023.git.jpoimboe@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/kernel/stacktrace.c | 74 +++++++++++++++++--------------------------- 1 file changed, 29 insertions(+), 45 deletions(-) diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c index 23fa81e..0653788 100644 --- a/arch/x86/kernel/stacktrace.c +++ b/arch/x86/kernel/stacktrace.c @@ -8,73 +8,59 @@ #include <linux/export.h> #include <linux/uaccess.h> #include <asm/stacktrace.h> +#include <asm/unwind.h> -static int save_stack_stack(void *data, const char *name) +static int save_stack_address(struct stack_trace *trace, unsigned long addr, + bool nosched) { - return 0; -} - -static int -__save_stack_address(void *data, unsigned long addr, bool reliable, bool nosched) -{ - struct stack_trace *trace = data; -#ifdef CONFIG_FRAME_POINTER - if (!reliable) - return 0; -#endif if (nosched && in_sched_functions(addr)) return 0; + if (trace->skip > 0) { trace->skip--; return 0; } - if (trace->nr_entries < trace->max_entries) { - trace->entries[trace->nr_entries++] = addr; - return 0; - } else { - return -1; /* no more room, stop walking the stack */ - } -} -static int save_stack_address(void *data, unsigned long addr, int reliable) -{ - return __save_stack_address(data, addr, reliable, false); + if (trace->nr_entries >= trace->max_entries) + return -1; + + trace->entries[trace->nr_entries++] = addr; + return 0; } -static int -save_stack_address_nosched(void *data, unsigned long addr, int reliable) +static void __save_stack_trace(struct stack_trace *trace, + struct task_struct *task, struct pt_regs *regs, + bool nosched) { - return __save_stack_address(data, addr, reliable, true); -} + struct unwind_state state; + unsigned long addr; -static const struct stacktrace_ops save_stack_ops = { - .stack = save_stack_stack, - .address = save_stack_address, - .walk_stack = print_context_stack, -}; + if (regs) + save_stack_address(trace, regs->ip, nosched); -static const struct stacktrace_ops save_stack_ops_nosched = { - .stack = save_stack_stack, - .address = save_stack_address_nosched, - .walk_stack = print_context_stack, -}; + for (unwind_start(&state, task, regs, NULL); !unwind_done(&state); + unwind_next_frame(&state)) { + addr = unwind_get_return_address(&state); + if (!addr || save_stack_address(trace, addr, nosched)) + break; + } + + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; +} /* * Save stack-backtrace addresses into a stack_trace buffer. */ void save_stack_trace(struct stack_trace *trace) { - dump_trace(current, NULL, NULL, 0, &save_stack_ops, trace); - if (trace->nr_entries < trace->max_entries) - trace->entries[trace->nr_entries++] = ULONG_MAX; + __save_stack_trace(trace, current, NULL, false); } EXPORT_SYMBOL_GPL(save_stack_trace); void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) { - dump_trace(current, regs, NULL, 0, &save_stack_ops, trace); - if (trace->nr_entries < trace->max_entries) - trace->entries[trace->nr_entries++] = ULONG_MAX; + __save_stack_trace(trace, current, regs, false); } void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) @@ -82,9 +68,7 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) if (!try_get_task_stack(tsk)) return; - dump_trace(tsk, NULL, NULL, 0, &save_stack_ops_nosched, trace); - if (trace->nr_entries < trace->max_entries) - trace->entries[trace->nr_entries++] = ULONG_MAX; + __save_stack_trace(trace, tsk, NULL, true); put_task_stack(tsk); } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html