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x86/dumpstack: Remove dump_trace() and related callbacks

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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>
This commit is contained in:
Josh Poimboeuf 2016-09-16 14:18:17 -05:00 • committed by Ingo Molnar
parent e18bcccd1a
commit c8fe460982
4 changed files with 0 additions and 226 deletions
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86
arch/x86/kernel/dumpstack.c
View file

@ -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)
{