The patch titled
Remove smp_alt_instructions
has been added to the -mm tree. Its filename is
remove-smp_alt_instructions.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: Remove smp_alt_instructions
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
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@xxxxxxxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/i386/kernel/alternative.c | 38 +------------------------------
arch/i386/kernel/vmlinux.lds.S | 11 --------
include/asm-i386/alternative.h | 6 ----
3 files changed, 3 insertions(+), 52 deletions(-)
diff -puN arch/i386/kernel/alternative.c~remove-smp_alt_instructions arch/i386/kernel/alternative.c
--- a/arch/i386/kernel/alternative.c~remove-smp_alt_instructions
+++ a/arch/i386/kernel/alternative.c
@@ -132,11 +132,8 @@ static void nop_out(void *insns, unsigne
}
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
#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(voi
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 -puN arch/i386/kernel/vmlinux.lds.S~remove-smp_alt_instructions arch/i386/kernel/vmlinux.lds.S
--- a/arch/i386/kernel/vmlinux.lds.S~remove-smp_alt_instructions
+++ a/arch/i386/kernel/vmlinux.lds.S
@@ -119,22 +119,11 @@ 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 -puN include/asm-i386/alternative.h~remove-smp_alt_instructions include/asm-i386/alternative.h
--- a/include/asm-i386/alternative.h~remove-smp_alt_instructions
+++ a/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>
@@ -31,9 +29,7 @@ static inline void alternatives_smp_modu
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.
_
Patches currently in -mm which might be from jeremy@xxxxxxxx are
re-enable-vdso-by-default-with-paravirt.patch
remove-noreplacement-option.patch
remove-smp_alt_instructions.patch
rename-the-parainstructions-symbols-to-be-consistent-with-the-others.patch
allow-boot-time-disable-of-smp-altinstructions.patch
allow-boot-time-disable-of-paravirt_ops-patching.patch
fixes-and-cleanups-for-earlyprintk-aka-boot-console.patch
ignore-stolen-time-in-the-softlockup-watchdog.patch
add-touch_all_softlockup_watchdogs.patch
clean-up-elf-note-generation.patch
-
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