mirror of https://gitee.com/openkylin/linux.git
x86: properly annotate alternatives.c
Some of the NOPs tables aren't used on 64-bits, quite some code and data is needed post-init for module loading only, and a couple of functions aren't used outside that file (i.e. can be static, and don't need to be exported). The change to __INITDATA/__INITRODATA is needed to avoid an assembler warning. Signed-off-by: Jan Beulich <jbeulich@novell.com> LKML-Reference: <4A8BC8A00200007800010823@vpn.id2.novell.com> Acked-by: Sam Ravnborg <sam@ravnborg.org> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Jan Beulich
H. Peter Anvin
parent
c7425314c7
commit
8b5a10fc6f
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@ -73,8 +73,6 @@ static inline void alternatives_smp_module_del(struct module *mod) {}
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static inline void alternatives_smp_switch(int smp) {}
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#endif /* CONFIG_SMP */
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const unsigned char *const *find_nop_table(void);
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/* alternative assembly primitive: */
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#define ALTERNATIVE(oldinstr, newinstr, feature) \
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\
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@ -144,8 +142,6 @@ static inline void apply_paravirt(struct paravirt_patch_site *start,
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#define __parainstructions_end NULL
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#endif
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extern void add_nops(void *insns, unsigned int len);
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/*
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* Clear and restore the kernel write-protection flag on the local CPU.
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* Allows the kernel to edit read-only pages.
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@ -161,10 +157,7 @@ extern void add_nops(void *insns, unsigned int len);
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* Intel's errata.
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* On the local CPU you need to be protected again NMI or MCE handlers seeing an
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* inconsistent instruction while you patch.
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* The _early version expects the memory to already be RW.
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*/
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extern void *text_poke(void *addr, const void *opcode, size_t len);
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extern void *text_poke_early(void *addr, const void *opcode, size_t len);
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#endif /* _ASM_X86_ALTERNATIVE_H */
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@ -2,6 +2,7 @@
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/list.h>
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#include <linux/stringify.h>
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#include <linux/kprobes.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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@ -32,7 +33,7 @@ __setup("smp-alt-boot", bootonly);
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#define smp_alt_once 1
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#endif
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static int debug_alternative;
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static int __initdata_or_module debug_alternative;
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static int __init debug_alt(char *str)
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{
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@ -51,7 +52,7 @@ static int __init setup_noreplace_smp(char *str)
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__setup("noreplace-smp", setup_noreplace_smp);
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#ifdef CONFIG_PARAVIRT
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static int noreplace_paravirt = 0;
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static int __initdata_or_module noreplace_paravirt = 0;
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static int __init setup_noreplace_paravirt(char *str)
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{
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@ -64,16 +65,17 @@ __setup("noreplace-paravirt", setup_noreplace_paravirt);
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#define DPRINTK(fmt, args...) if (debug_alternative) \
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printk(KERN_DEBUG fmt, args)
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#ifdef GENERIC_NOP1
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#if defined(GENERIC_NOP1) && !defined(CONFIG_X86_64)
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/* Use inline assembly to define this because the nops are defined
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as inline assembly strings in the include files and we cannot
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get them easily into strings. */
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asm("\t.section .rodata, \"a\"\nintelnops: "
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asm("\t" __stringify(__INITRODATA_OR_MODULE) "\nintelnops: "
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GENERIC_NOP1 GENERIC_NOP2 GENERIC_NOP3 GENERIC_NOP4 GENERIC_NOP5 GENERIC_NOP6
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GENERIC_NOP7 GENERIC_NOP8
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"\t.previous");
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extern const unsigned char intelnops[];
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static const unsigned char *const intel_nops[ASM_NOP_MAX+1] = {
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static const unsigned char *const __initconst_or_module
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intel_nops[ASM_NOP_MAX+1] = {
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NULL,
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intelnops,
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intelnops + 1,
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@ -87,12 +89,13 @@ static const unsigned char *const intel_nops[ASM_NOP_MAX+1] = {
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#endif
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#ifdef K8_NOP1
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asm("\t.section .rodata, \"a\"\nk8nops: "
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asm("\t" __stringify(__INITRODATA_OR_MODULE) "\nk8nops: "
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K8_NOP1 K8_NOP2 K8_NOP3 K8_NOP4 K8_NOP5 K8_NOP6
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K8_NOP7 K8_NOP8
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"\t.previous");
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extern const unsigned char k8nops[];
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static const unsigned char *const k8_nops[ASM_NOP_MAX+1] = {
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static const unsigned char *const __initconst_or_module
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k8_nops[ASM_NOP_MAX+1] = {
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NULL,
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k8nops,
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k8nops + 1,
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@ -105,13 +108,14 @@ static const unsigned char *const k8_nops[ASM_NOP_MAX+1] = {
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};
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#endif
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#ifdef K7_NOP1
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asm("\t.section .rodata, \"a\"\nk7nops: "
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#if defined(K7_NOP1) && !defined(CONFIG_X86_64)
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asm("\t" __stringify(__INITRODATA_OR_MODULE) "\nk7nops: "
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K7_NOP1 K7_NOP2 K7_NOP3 K7_NOP4 K7_NOP5 K7_NOP6
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K7_NOP7 K7_NOP8
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"\t.previous");
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extern const unsigned char k7nops[];
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static const unsigned char *const k7_nops[ASM_NOP_MAX+1] = {
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static const unsigned char *const __initconst_or_module
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k7_nops[ASM_NOP_MAX+1] = {
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NULL,
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k7nops,
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k7nops + 1,
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@ -125,12 +129,13 @@ static const unsigned char *const k7_nops[ASM_NOP_MAX+1] = {
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#endif
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#ifdef P6_NOP1
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asm("\t.section .rodata, \"a\"\np6nops: "
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asm("\t" __stringify(__INITRODATA_OR_MODULE) "\np6nops: "
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P6_NOP1 P6_NOP2 P6_NOP3 P6_NOP4 P6_NOP5 P6_NOP6
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P6_NOP7 P6_NOP8
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"\t.previous");
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extern const unsigned char p6nops[];
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static const unsigned char *const p6_nops[ASM_NOP_MAX+1] = {
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static const unsigned char *const __initconst_or_module
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p6_nops[ASM_NOP_MAX+1] = {
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NULL,
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p6nops,
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p6nops + 1,
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@ -146,7 +151,7 @@ static const unsigned char *const p6_nops[ASM_NOP_MAX+1] = {
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#ifdef CONFIG_X86_64
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extern char __vsyscall_0;
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const unsigned char *const *find_nop_table(void)
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static const unsigned char *const *__init_or_module find_nop_table(void)
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{
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if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
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boot_cpu_has(X86_FEATURE_NOPL))
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@ -157,7 +162,7 @@ const unsigned char *const *find_nop_table(void)
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#else /* CONFIG_X86_64 */
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const unsigned char *const *find_nop_table(void)
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static const unsigned char *const *__init_or_module find_nop_table(void)
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{
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if (boot_cpu_has(X86_FEATURE_K8))
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return k8_nops;
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@ -172,7 +177,7 @@ const unsigned char *const *find_nop_table(void)
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#endif /* CONFIG_X86_64 */
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/* Use this to add nops to a buffer, then text_poke the whole buffer. */
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void add_nops(void *insns, unsigned int len)
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static void __init_or_module add_nops(void *insns, unsigned int len)
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{
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const unsigned char *const *noptable = find_nop_table();
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@ -185,10 +190,10 @@ void add_nops(void *insns, unsigned int len)
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len -= noplen;
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}
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}
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EXPORT_SYMBOL_GPL(add_nops);
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extern struct alt_instr __alt_instructions[], __alt_instructions_end[];
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extern u8 *__smp_locks[], *__smp_locks_end[];
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static void *text_poke_early(void *addr, const void *opcode, size_t len);
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/* Replace instructions with better alternatives for this CPU type.
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This runs before SMP is initialized to avoid SMP problems with
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@ -196,7 +201,8 @@ extern u8 *__smp_locks[], *__smp_locks_end[];
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APs have less capabilities than the boot processor are not handled.
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Tough. Make sure you disable such features by hand. */
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void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
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void __init_or_module apply_alternatives(struct alt_instr *start,
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struct alt_instr *end)
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{
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struct alt_instr *a;
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char insnbuf[MAX_PATCH_LEN];
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@ -279,9 +285,10 @@ static LIST_HEAD(smp_alt_modules);
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static DEFINE_MUTEX(smp_alt);
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static int smp_mode = 1; /* protected by smp_alt */
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void alternatives_smp_module_add(struct module *mod, char *name,
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void *locks, void *locks_end,
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void *text, void *text_end)
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void __init_or_module alternatives_smp_module_add(struct module *mod,
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char *name,
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void *locks, void *locks_end,
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void *text, void *text_end)
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{
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struct smp_alt_module *smp;
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@ -317,7 +324,7 @@ void alternatives_smp_module_add(struct module *mod, char *name,
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mutex_unlock(&smp_alt);
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}
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void alternatives_smp_module_del(struct module *mod)
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void __init_or_module alternatives_smp_module_del(struct module *mod)
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{
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struct smp_alt_module *item;
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@ -386,8 +393,8 @@ void alternatives_smp_switch(int smp)
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#endif
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#ifdef CONFIG_PARAVIRT
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void apply_paravirt(struct paravirt_patch_site *start,
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struct paravirt_patch_site *end)
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void __init_or_module apply_paravirt(struct paravirt_patch_site *start,
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struct paravirt_patch_site *end)
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{
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struct paravirt_patch_site *p;
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char insnbuf[MAX_PATCH_LEN];
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@ -485,7 +492,8 @@ void __init alternative_instructions(void)
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* instructions. And on the local CPU you need to be protected again NMI or MCE
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* handlers seeing an inconsistent instruction while you patch.
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*/
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void *text_poke_early(void *addr, const void *opcode, size_t len)
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static void *__init_or_module text_poke_early(void *addr, const void *opcode,
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size_t len)
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{
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unsigned long flags;
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local_irq_save(flags);
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@ -103,8 +103,8 @@
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#define __INIT .section ".init.text","ax"
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#define __FINIT .previous
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#define __INITDATA .section ".init.data","aw"
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#define __INITRODATA .section ".init.rodata","a"
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#define __INITDATA .section ".init.data","aw",%progbits
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#define __INITRODATA .section ".init.rodata","a",%progbits
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#define __FINITDATA .previous
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#define __DEVINIT .section ".devinit.text", "ax"
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@ -305,9 +305,17 @@ void __init parse_early_options(char *cmdline);
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#ifdef CONFIG_MODULES
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#define __init_or_module
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#define __initdata_or_module
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#define __initconst_or_module
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#define __INIT_OR_MODULE .text
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#define __INITDATA_OR_MODULE .data
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#define __INITRODATA_OR_MODULE .section ".rodata","a",%progbits
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#else
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#define __init_or_module __init
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#define __initdata_or_module __initdata
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#define __initconst_or_module __initconst
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#define __INIT_OR_MODULE __INIT
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#define __INITDATA_OR_MODULE __INITDATA
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#define __INITRODATA_OR_MODULE __INITRODATA
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#endif /*CONFIG_MODULES*/
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/* Functions marked as __devexit may be discarded at kernel link time, depending
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