x86/dumpstack: Remove dump_trace() and related callbacks

All previous users of dump_trace() have been converted to use the new
unwind interfaces, so we can remove it and the related
print_context_stack() and print_context_stack_bp() callback functions.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Byungchul Park <byungchul.park@lge.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nilay Vaish <nilayvaish@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5b97da3572b40b5a4d8e185cf2429308d0987a13.1474045023.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 0 insertions, 86 deletions

diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index c08f32ab8ace..999de3b3f7f4 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -56,92 +56,6 @@ void printk_address(unsigned long address)
         pr_cont(" [<%p>] %pS\n", (void *)address, (void *)address);
 }
 
-/*
- * x86-64 can have up to three kernel stacks:
- * process stack
- * interrupt stack
- * severe exception (double fault, nmi, stack fault, debug, mce) hardware stack
- */
-
-unsigned long
-print_context_stack(struct task_struct *task,
-                unsigned long *stack, unsigned long bp,
-                const struct stacktrace_ops *ops, void *data,
-                struct stack_info *info, int *graph)
-{
-        struct stack_frame *frame = (struct stack_frame *)bp;
-
-        /*
-         * If we overflowed the stack into a guard page, jump back to the
-         * bottom of the usable stack.
-         */
-        if ((unsigned long)task_stack_page(task) - (unsigned long)stack <
-            PAGE_SIZE)
-                stack = (unsigned long *)task_stack_page(task);
-
-        while (on_stack(info, stack, sizeof(*stack))) {
-                unsigned long addr = *stack;
-
-                if (__kernel_text_address(addr)) {
-                        unsigned long real_addr;
-                        int reliable = 0;
-
-                        if ((unsigned long) stack == bp + sizeof(long)) {
-                                reliable = 1;
-                                frame = frame->next_frame;
-                                bp = (unsigned long) frame;
-                        }
-
-                        /*
-                         * When function graph tracing is enabled for a
-                         * function, its return address on the stack is
-                         * replaced with the address of an ftrace handler
-                         * (return_to_handler).  In that case, before printing
-                         * the "real" address, we want to print the handler
-                         * address as an "unreliable" hint that function graph
-                         * tracing was involved.
-                         */
-                        real_addr = ftrace_graph_ret_addr(task, graph, addr,
-                                                          stack);
-                        if (real_addr != addr)
-                                ops->address(data, addr, 0);
-
-                        ops->address(data, real_addr, reliable);
-                }
-                stack++;
-        }
-        return bp;
-}
-EXPORT_SYMBOL_GPL(print_context_stack);
-
-unsigned long
-print_context_stack_bp(struct task_struct *task,
-                       unsigned long *stack, unsigned long bp,
-                       const struct stacktrace_ops *ops, void *data,
-                       struct stack_info *info, int *graph)
-{
-        struct stack_frame *frame = (struct stack_frame *)bp;
-        unsigned long *retp = &frame->return_address;
-
-        while (on_stack(info, stack, sizeof(*stack) * 2)) {
-                unsigned long addr = *retp;
-                unsigned long real_addr;
-
-                if (!__kernel_text_address(addr))
-                        break;
-
-                real_addr = ftrace_graph_ret_addr(task, graph, addr, retp);
-                if (ops->address(data, real_addr, 1))
-                        break;
-
-                frame = frame->next_frame;
-                retp = &frame->return_address;
-        }
-
-        return (unsigned long)frame;
-}
-EXPORT_SYMBOL_GPL(print_context_stack_bp);
-
 void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
                         unsigned long *stack, char *log_lvl)
 {