[PATCH] i386: Remove smp_alt_instructions

The .smp_altinstructions section and its corresponding symbols are
completely unused, so remove them.

Also, remove stray #ifdef __KENREL__ in asm-i386/alternative.h

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>

3 files changed, 3 insertions, 52 deletions

diff --git a/arch/i386/kernel/alternative.c b/arch/i386/kernel/alternative.c
index a27c8d347364..f09635408049 100644
--- a/arch/i386/kernel/alternative.c
+++ b/arch/i386/kernel/alternative.c
@@ -132,11 +132,8 @@ static void nop_out(void *insns, unsigned int len)
 }
 
 extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
-extern struct alt_instr __smp_alt_instructions[], __smp_alt_instructions_end[];
 extern u8 *__smp_locks[], *__smp_locks_end[];
 
-extern u8 __smp_alt_begin[], __smp_alt_end[];
-
 /* Replace instructions with better alternatives for this CPU type.
    This runs before SMP is initialized to avoid SMP problems with
    self modifying code. This implies that assymetric systems where
@@ -171,29 +168,6 @@ void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 
 #ifdef CONFIG_SMP
 
-static void alternatives_smp_save(struct alt_instr *start, struct alt_instr *end)
-{
-        struct alt_instr *a;
-
-        DPRINTK("%s: alt table %p-%p\n", __FUNCTION__, start, end);
-        for (a = start; a < end; a++) {
-                memcpy(a->replacement + a->replacementlen,
-                       a->instr,
-                       a->instrlen);
-        }
-}
-
-static void alternatives_smp_apply(struct alt_instr *start, struct alt_instr *end)
-{
-        struct alt_instr *a;
-
-        for (a = start; a < end; a++) {
-                memcpy(a->instr,
-                       a->replacement + a->replacementlen,
-                       a->instrlen);
-        }
-}
-
 static void alternatives_smp_lock(u8 **start, u8 **end, u8 *text, u8 *text_end)
 {
         u8 **ptr;
@@ -319,8 +293,6 @@ void alternatives_smp_switch(int smp)
                 printk(KERN_INFO "SMP alternatives: switching to SMP code\n");
                 clear_bit(X86_FEATURE_UP, boot_cpu_data.x86_capability);
                 clear_bit(X86_FEATURE_UP, cpu_data[0].x86_capability);
-                alternatives_smp_apply(__smp_alt_instructions,
-                                       __smp_alt_instructions_end);
                 list_for_each_entry(mod, &smp_alt_modules, next)
                         alternatives_smp_lock(mod->locks, mod->locks_end,
                                               mod->text, mod->text_end);
@@ -328,8 +300,6 @@ void alternatives_smp_switch(int smp)
                 printk(KERN_INFO "SMP alternatives: switching to UP code\n");
                 set_bit(X86_FEATURE_UP, boot_cpu_data.x86_capability);
                 set_bit(X86_FEATURE_UP, cpu_data[0].x86_capability);
-                apply_alternatives(__smp_alt_instructions,
-                                   __smp_alt_instructions_end);
                 list_for_each_entry(mod, &smp_alt_modules, next)
                         alternatives_smp_unlock(mod->locks, mod->locks_end,
                                                 mod->text, mod->text_end);
@@ -396,17 +366,13 @@ void __init alternative_instructions(void)
                         printk(KERN_INFO "SMP alternatives: switching to UP code\n");
                         set_bit(X86_FEATURE_UP, boot_cpu_data.x86_capability);
                         set_bit(X86_FEATURE_UP, cpu_data[0].x86_capability);
-                        apply_alternatives(__smp_alt_instructions,
-                                           __smp_alt_instructions_end);
                         alternatives_smp_unlock(__smp_locks, __smp_locks_end,
                                                 _text, _etext);
                 }
                 free_init_pages("SMP alternatives",
-                                __pa_symbol(&__smp_alt_begin),
-                                __pa_symbol(&__smp_alt_end));
+                                __pa_symbol(&__smp_locks),
+                                __pa_symbol(&__smp_locks_end));
         } else {
-                alternatives_smp_save(__smp_alt_instructions,
-                                      __smp_alt_instructions_end);
                 alternatives_smp_module_add(NULL, "core kernel",
                                             __smp_locks, __smp_locks_end,
                                             _text, _etext);
diff --git a/arch/i386/kernel/vmlinux.lds.S b/arch/i386/kernel/vmlinux.lds.S
index 97fe6eac47c9..2ce4aa185fc8 100644
--- a/arch/i386/kernel/vmlinux.lds.S
+++ b/arch/i386/kernel/vmlinux.lds.S
@@ -117,22 +117,11 @@ SECTIONS
 
   /* might get freed after init */
   . = ALIGN(4096);
-  .smp_altinstructions : AT(ADDR(.smp_altinstructions) - LOAD_OFFSET) {
-        __smp_alt_begin = .;
-        __smp_alt_instructions = .;
-        *(.smp_altinstructions)
-        __smp_alt_instructions_end = .;
-  }
-  . = ALIGN(4);
   .smp_locks : AT(ADDR(.smp_locks) - LOAD_OFFSET) {
         __smp_locks = .;
         *(.smp_locks)
         __smp_locks_end = .;
   }
-  .smp_altinstr_replacement : AT(ADDR(.smp_altinstr_replacement) - LOAD_OFFSET) {
-        *(.smp_altinstr_replacement)
-        __smp_alt_end = .;
-  }
   /* will be freed after init
    * Following ALIGN() is required to make sure no other data falls on the
    * same page where __smp_alt_end is pointing as that page might be freed
diff --git a/include/asm-i386/alternative.h b/include/asm-i386/alternative.h
index dbc1a29284f3..4d518eebe461 100644
--- a/include/asm-i386/alternative.h
+++ b/include/asm-i386/alternative.h
@@ -1,8 +1,6 @@
 #ifndef _I386_ALTERNATIVE_H
 #define _I386_ALTERNATIVE_H
 
-#ifdef __KERNEL__
-
 #include <asm/types.h>
 #include <linux/stddef.h>
 #include <linux/types.h>
@@ -32,9 +30,7 @@ static inline void alternatives_smp_module_add(struct module *mod, char *name,
                                         void *text, void *text_end) {}
 static inline void alternatives_smp_module_del(struct module *mod) {}
 static inline void alternatives_smp_switch(int smp) {}
-#endif
-
-#endif
+#endif  /* CONFIG_SMP */
 
 /*
  * Alternative instructions for different CPU types or capabilities.