5 files changed, 0 insertions, 123 deletions

diff --git a/arch/x86_64/Makefile b/arch/x86_64/Makefile
index b471b8550d03..2941a915d4ef 100644
--- a/arch/x86_64/Makefile
+++ b/arch/x86_64/Makefile
@@ -45,9 +45,7 @@ cflags-kernel-$(CONFIG_REORDER) += -ffunction-sections
 # actually it makes the kernel smaller too.
 cflags-y += -fno-reorder-blocks
 cflags-y += -Wno-sign-compare
-ifneq ($(CONFIG_UNWIND_INFO),y)
 cflags-y += -fno-asynchronous-unwind-tables
-endif
 ifneq ($(CONFIG_DEBUG_INFO),y)
 # -fweb shrinks the kernel a bit, but the difference is very small
 # it also messes up debugging, so don't use it for now.
diff --git a/arch/x86_64/defconfig b/arch/x86_64/defconfig
index 1a1c6a1a299b..ac80b1209fc0 100644
--- a/arch/x86_64/defconfig
+++ b/arch/x86_64/defconfig
@@ -1523,8 +1523,6 @@ CONFIG_DEBUG_FS=y
 # CONFIG_DEBUG_VM is not set
 # CONFIG_DEBUG_LIST is not set
 # CONFIG_FRAME_POINTER is not set
-CONFIG_UNWIND_INFO=y
-CONFIG_STACK_UNWIND=y
 # CONFIG_FORCED_INLINING is not set
 # CONFIG_HEADERS_CHECK is not set
 # CONFIG_RCU_TORTURE_TEST is not set
diff --git a/arch/x86_64/kernel/entry.S b/arch/x86_64/kernel/entry.S
index 601d332c4b79..9f5dac64aa8f 100644
--- a/arch/x86_64/kernel/entry.S
+++ b/arch/x86_64/kernel/entry.S
@@ -1155,36 +1155,3 @@ ENTRY(call_softirq)
         ret
         CFI_ENDPROC
 ENDPROC(call_softirq)
-
-#ifdef CONFIG_STACK_UNWIND
-ENTRY(arch_unwind_init_running)
-        CFI_STARTPROC
-        movq    %r15, R15(%rdi)
-        movq    %r14, R14(%rdi)
-        xchgq   %rsi, %rdx
-        movq    %r13, R13(%rdi)
-        movq    %r12, R12(%rdi)
-        xorl    %eax, %eax
-        movq    %rbp, RBP(%rdi)
-        movq    %rbx, RBX(%rdi)
-        movq    (%rsp), %rcx
-        movq    %rax, R11(%rdi)
-        movq    %rax, R10(%rdi)
-        movq    %rax, R9(%rdi)
-        movq    %rax, R8(%rdi)
-        movq    %rax, RAX(%rdi)
-        movq    %rax, RCX(%rdi)
-        movq    %rax, RDX(%rdi)
-        movq    %rax, RSI(%rdi)
-        movq    %rax, RDI(%rdi)
-        movq    %rax, ORIG_RAX(%rdi)
-        movq    %rcx, RIP(%rdi)
-        leaq    8(%rsp), %rcx
-        movq    $__KERNEL_CS, CS(%rdi)
-        movq    %rax, EFLAGS(%rdi)
-        movq    %rcx, RSP(%rdi)
-        movq    $__KERNEL_DS, SS(%rdi)
-        jmpq    *%rdx
-        CFI_ENDPROC
-ENDPROC(arch_unwind_init_running)
-#endif
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index b54ccc07f379..1d9eb6db732a 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -110,11 +110,6 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
 }
 
 int kstack_depth_to_print = 12;
-#ifdef CONFIG_STACK_UNWIND
-static int call_trace = 1;
-#else
-#define call_trace (-1)
-#endif
 
 #ifdef CONFIG_KALLSYMS
 void printk_address(unsigned long address)
@@ -217,32 +212,6 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
         return NULL;
 }
 
-struct ops_and_data {
-        struct stacktrace_ops *ops;
-        void *data;
-};
-
-static int dump_trace_unwind(struct unwind_frame_info *info, void *context)
-{
-        struct ops_and_data *oad = (struct ops_and_data *)context;
-        int n = 0;
-        unsigned long sp = UNW_SP(info);
-
-        if (arch_unw_user_mode(info))
-                return -1;
-        while (unwind(info) == 0 && UNW_PC(info)) {
-                n++;
-                oad->ops->address(oad->data, UNW_PC(info));
-                if (arch_unw_user_mode(info))
-                        break;
-                if ((sp & ~(PAGE_SIZE - 1)) == (UNW_SP(info) & ~(PAGE_SIZE - 1))
-                    && sp > UNW_SP(info))
-                        break;
-                sp = UNW_SP(info);
-        }
-        return n;
-}
-
 #define MSG(txt) ops->warning(data, txt)
 
 /*
@@ -270,40 +239,6 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
         if (!tsk)
                 tsk = current;
 
-        if (call_trace >= 0) {
-                int unw_ret = 0;
-                struct unwind_frame_info info;
-                struct ops_and_data oad = { .ops = ops, .data = data };
-
-                if (regs) {
-                        if (unwind_init_frame_info(&info, tsk, regs) == 0)
-                                unw_ret = dump_trace_unwind(&info, &oad);
-                } else if (tsk == current)
-                        unw_ret = unwind_init_running(&info, dump_trace_unwind,
-                                                      &oad);
-                else {
-                        if (unwind_init_blocked(&info, tsk) == 0)
-                                unw_ret = dump_trace_unwind(&info, &oad);
-                }
-                if (unw_ret > 0) {
-                        if (call_trace == 1 && !arch_unw_user_mode(&info)) {
-                                ops->warning_symbol(data,
-                                             "DWARF2 unwinder stuck at %s",
-                                             UNW_PC(&info));
-                                if ((long)UNW_SP(&info) < 0) {
-                                        MSG("Leftover inexact backtrace:");
-                                        stack = (unsigned long *)UNW_SP(&info);
-                                        if (!stack)
-                                                goto out;
-                                } else
-                                        MSG("Full inexact backtrace again:");
-                        } else if (call_trace >= 1)
-                                goto out;
-                        else
-                                MSG("Full inexact backtrace again:");
-                } else
-                        MSG("Inexact backtrace:");
-        }
         if (!stack) {
                 unsigned long dummy;
                 stack = &dummy;
@@ -387,7 +322,6 @@ void dump_trace(struct task_struct *tsk, struct pt_regs *regs,
         tinfo = current_thread_info();
         HANDLE_STACK (valid_stack_ptr(tinfo, stack));
 #undef HANDLE_STACK
-out:
         put_cpu();
 }
 EXPORT_SYMBOL(dump_trace);
@@ -1188,21 +1122,3 @@ static int __init kstack_setup(char *s)
         return 0;
 }
 early_param("kstack", kstack_setup);
-
-#ifdef CONFIG_STACK_UNWIND
-static int __init call_trace_setup(char *s)
-{
-        if (!s)
-                return -EINVAL;
-        if (strcmp(s, "old") == 0)
-                call_trace = -1;
-        else if (strcmp(s, "both") == 0)
-                call_trace = 0;
-        else if (strcmp(s, "newfallback") == 0)
-                call_trace = 1;
-        else if (strcmp(s, "new") == 0)
-                call_trace = 2;
-        return 0;
-}
-early_param("call_trace", call_trace_setup);
-#endif
diff --git a/arch/x86_64/kernel/vmlinux.lds.S b/arch/x86_64/kernel/vmlinux.lds.S
index 514be5dd2303..1e54ddf2338d 100644
--- a/arch/x86_64/kernel/vmlinux.lds.S
+++ b/arch/x86_64/kernel/vmlinux.lds.S
@@ -221,9 +221,7 @@ SECTIONS
   /* Sections to be discarded */
   /DISCARD/ : {
         *(.exitcall.exit)
-#ifndef CONFIG_UNWIND_INFO
         *(.eh_frame)
-#endif
         }
 
   STABS_DEBUG