From 006e84ee3a54e393ec6bef2a9bc891dc5bde2843 Mon Sep 17 00:00:00 2001 From: Catalin Marinas Date: Tue, 13 Feb 2007 13:26:21 +0100 Subject: [PATCH] [PATCH] x86-64: do not always end the stack trace with ULONG_MAX It makes more sense to end the stack trace with ULONG_MAX only if nr_entries < max_entries. Otherwise, we lose one entry in the long stack traces and cannot know whether the trace was complete or not. Signed-off-by: Catalin Marinas Signed-off-by: Andi Kleen Cc: Andi Kleen Cc: Jan Beulich Signed-off-by: Andrew Morton --- arch/x86_64/kernel/stacktrace.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86_64/kernel/stacktrace.c b/arch/x86_64/kernel/stacktrace.c index 6026b31d037e..65ac2c6b34a6 100644 --- a/arch/x86_64/kernel/stacktrace.c +++ b/arch/x86_64/kernel/stacktrace.c @@ -32,7 +32,7 @@ static void save_stack_address(void *data, unsigned long addr) trace->skip--; return; } - if (trace->nr_entries < trace->max_entries - 1) + if (trace->nr_entries < trace->max_entries) trace->entries[trace->nr_entries++] = addr; } @@ -49,7 +49,8 @@ static struct stacktrace_ops save_stack_ops = { void save_stack_trace(struct stack_trace *trace, struct task_struct *task) { dump_trace(task, NULL, NULL, &save_stack_ops, trace); - trace->entries[trace->nr_entries++] = ULONG_MAX; + if (trace->nr_entries < trace->max_entries) + trace->entries[trace->nr_entries++] = ULONG_MAX; } EXPORT_SYMBOL(save_stack_trace); -- 2.30.2