Remove remaining unwinder code

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Gabor Gombas <gombasg@sztaki.hu>
Cc: Jan Beulich <jbeulich@novell.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 0 insertions, 105 deletions

diff --git a/arch/x86/include/asm/unwind.h b/arch/x86/include/asm/unwind.h
deleted file mode 100644
index 8b064bd9c55..00000000000
--- a/arch/x86/include/asm/unwind.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef _ASM_X86_UNWIND_H
-#define _ASM_X86_UNWIND_H
-
-#define UNW_PC(frame) ((void)(frame), 0UL)
-#define UNW_SP(frame) ((void)(frame), 0UL)
-#define UNW_FP(frame) ((void)(frame), 0UL)
-
-static inline int arch_unw_user_mode(const void *info)
-{
-        return 0;
-}
-
-#endif /* _ASM_X86_UNWIND_H */
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index ce6650eb64e..c9a666cdd3d 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -20,7 +20,6 @@
 #include <linux/module.h>
 #include <linux/ptrace.h>
 #include <linux/string.h>
-#include <linux/unwind.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/kexec.h>
@@ -51,7 +50,6 @@
 #include <asm/debugreg.h>
 #include <asm/atomic.h>
 #include <asm/system.h>
-#include <asm/unwind.h>
 #include <asm/traps.h>
 #include <asm/desc.h>
 #include <asm/i387.h>
diff --git a/include/linux/module.h b/include/linux/module.h
index 3bfed013350..03cb93d1865 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -294,9 +294,6 @@ struct module
         /* The size of the executable code in each section.  */
         unsigned int init_text_size, core_text_size;
 
-        /* The handle returned from unwind_add_table. */
-        void *unwind_info;
-
         /* Arch-specific module values */
         struct mod_arch_specific arch;
 
diff --git a/include/linux/unwind.h b/include/linux/unwind.h
deleted file mode 100644
index 7760860fa17..00000000000
--- a/include/linux/unwind.h
+++ /dev/null
@@ -1,68 +0,0 @@
-#ifndef _LINUX_UNWIND_H
-#define _LINUX_UNWIND_H
-
-/*
- * Copyright (C) 2002-2006 Novell, Inc.
- *      Jan Beulich <jbeulich@novell.com>
- * This code is released under version 2 of the GNU GPL.
- *
- * A simple API for unwinding kernel stacks.  This is used for
- * debugging and error reporting purposes.  The kernel doesn't need
- * full-blown stack unwinding with all the bells and whistles, so there
- * is not much point in implementing the full Dwarf2 unwind API.
- */
-
-struct module;
-
-struct unwind_frame_info {};
-
-static inline void unwind_init(void) {}
-static inline void unwind_setup(void) {}
-
-#ifdef CONFIG_MODULES
-
-static inline void *unwind_add_table(struct module *mod,
-                                     const void *table_start,
-                                     unsigned long table_size)
-{
-        return NULL;
-}
-
-static inline void unwind_remove_table(void *handle, int init_only)
-{
-}
-
-#endif
-
-static inline int unwind_init_frame_info(struct unwind_frame_info *info,
-                                         struct task_struct *tsk,
-                                         const struct pt_regs *regs)
-{
-        return -ENOSYS;
-}
-
-static inline int unwind_init_blocked(struct unwind_frame_info *info,
-                                      struct task_struct *tsk)
-{
-        return -ENOSYS;
-}
-
-static inline int unwind_init_running(struct unwind_frame_info *info,
-                                      asmlinkage int (*cb)(struct unwind_frame_info *,
-                                                           void *arg),
-                                      void *arg)
-{
-        return -ENOSYS;
-}
-
-static inline int unwind(struct unwind_frame_info *info)
-{
-        return -ENOSYS;
-}
-
-static inline int unwind_to_user(struct unwind_frame_info *info)
-{
-        return -ENOSYS;
-}
-
-#endif /* _LINUX_UNWIND_H */
diff --git a/init/main.c b/init/main.c
index 90926dadc20..e119dd28dd7 100644
--- a/init/main.c
+++ b/init/main.c
@@ -50,7 +50,6 @@
 #include <linux/rmap.h>
 #include <linux/mempolicy.h>
 #include <linux/key.h>
-#include <linux/unwind.h>
 #include <linux/buffer_head.h>
 #include <linux/page_cgroup.h>
 #include <linux/debug_locks.h>
@@ -537,7 +536,6 @@ asmlinkage void __init start_kernel(void)
          * Need to run as early as possible, to initialize the
          * lockdep hash:
          */
-        unwind_init();
         lockdep_init();
         debug_objects_early_init();
         cgroup_init_early();
@@ -559,7 +557,6 @@ asmlinkage void __init start_kernel(void)
         setup_arch(&command_line);
         mm_init_owner(&init_mm, &init_task);
         setup_command_line(command_line);
-        unwind_setup();
         setup_per_cpu_areas();
         setup_nr_cpu_ids();
         smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
diff --git a/kernel/module.c b/kernel/module.c
index f47cce910f2..34b56cf0661 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -43,7 +43,6 @@
 #include <linux/device.h>
 #include <linux/string.h>
 #include <linux/mutex.h>
-#include <linux/unwind.h>
 #include <linux/rculist.h>
 #include <asm/uaccess.h>
 #include <asm/cacheflush.h>
@@ -1449,8 +1448,6 @@ static void free_module(struct module *mod)
         remove_sect_attrs(mod);
         mod_kobject_remove(mod);
 
-        unwind_remove_table(mod->unwind_info, 0);
-
         /* Arch-specific cleanup. */
         module_arch_cleanup(mod);
 
@@ -1867,7 +1864,6 @@ static noinline struct module *load_module(void __user *umod,
         unsigned int symindex = 0;
         unsigned int strindex = 0;
         unsigned int modindex, versindex, infoindex, pcpuindex;
-        unsigned int unwindex = 0;
         unsigned int num_kp, num_mcount;
         struct kernel_param *kp;
         struct module *mod;
@@ -1957,9 +1953,6 @@ static noinline struct module *load_module(void __user *umod,
         versindex = find_sec(hdr, sechdrs, secstrings, "__versions");
         infoindex = find_sec(hdr, sechdrs, secstrings, ".modinfo");
         pcpuindex = find_pcpusec(hdr, sechdrs, secstrings);
-#ifdef ARCH_UNWIND_SECTION_NAME
-        unwindex = find_sec(hdr, sechdrs, secstrings, ARCH_UNWIND_SECTION_NAME);
-#endif
 
         /* Don't keep modinfo and version sections. */
         sechdrs[infoindex].sh_flags &= ~(unsigned long)SHF_ALLOC;
@@ -1969,8 +1962,6 @@ static noinline struct module *load_module(void __user *umod,
         sechdrs[symindex].sh_flags |= SHF_ALLOC;
         sechdrs[strindex].sh_flags |= SHF_ALLOC;
 #endif
-        if (unwindex)
-                sechdrs[unwindex].sh_flags |= SHF_ALLOC;
 
         /* Check module struct version now, before we try to use module. */
         if (!check_modstruct_version(sechdrs, versindex, mod)) {
@@ -2267,11 +2258,6 @@ static noinline struct module *load_module(void __user *umod,
         add_sect_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
         add_notes_attrs(mod, hdr->e_shnum, secstrings, sechdrs);
 
-        /* Size of section 0 is 0, so this works well if no unwind info. */
-        mod->unwind_info = unwind_add_table(mod,
-                                            (void *)sechdrs[unwindex].sh_addr,
-                                            sechdrs[unwindex].sh_size);
-
         /* Get rid of temporary copy */
         vfree(hdr);
 
@@ -2370,7 +2356,6 @@ sys_init_module(void __user *umod,
         mutex_lock(&module_mutex);
         /* Drop initial reference. */
         module_put(mod);
-        unwind_remove_table(mod->unwind_info, 1);
         module_free(mod, mod->module_init);
         mod->module_init = NULL;
         mod->init_size = 0;
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index a50a311554c..f97af55bdd9 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -6,7 +6,6 @@
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
-#include <linux/unwind.h>
 #include <linux/stacktrace.h>
 #include <linux/kallsyms.h>
 #include <linux/fault-inject.h>