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Message-ID: <53235B15.7070807@oracle.com>
Date: Fri, 14 Mar 2014 15:40:05 -0400
From: Sasha Levin <sasha.levin@...cle.com>
To: rostedt@...dmis.org
CC: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
Sasha Levin <sasha.levin@...cle.com>
Subject: Re: [PATCH] jump label: constify lookup functions
ping?
On 02/12/2014 08:56 AM, Sasha Levin wrote:
> ping?
>
> On 01/27/2014 02:27 PM, Sasha Levin wrote:
>> Modify the parameters of all the lookup and the bookkeeping functions which
>> should be const to const.
>>
>> For example, jump_label_text_reserved() doesn't modify the memory it works on,
>> it just checks whether there are any jump labels there.
>>
>> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
>> ---
>> arch/arm/include/asm/jump_label.h | 2 +-
>> arch/arm/kernel/jump_label.c | 6 ++---
>> arch/arm64/include/asm/jump_label.h | 2 +-
>> arch/arm64/kernel/jump_label.c | 6 ++---
>> arch/mips/include/asm/jump_label.h | 2 +-
>> arch/mips/kernel/jump_label.c | 2 +-
>> arch/powerpc/include/asm/jump_label.h | 2 +-
>> arch/powerpc/kernel/jump_label.c | 2 +-
>> arch/s390/include/asm/jump_label.h | 2 +-
>> arch/s390/kernel/jump_label.c | 12 ++++-----
>> arch/sparc/include/asm/jump_label.h | 2 +-
>> arch/sparc/kernel/jump_label.c | 2 +-
>> arch/x86/include/asm/jump_label.h | 2 +-
>> arch/x86/include/asm/spinlock.h | 2 +-
>> arch/x86/kernel/jump_label.c | 6 ++---
>> include/linux/jump_label.h | 27 ++++++++++----------
>> kernel/jump_label.c | 46 ++++++++++++++++++-----------------
>> 17 files changed, 64 insertions(+), 61 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/jump_label.h b/arch/arm/include/asm/jump_label.h
>> index 863c892..c8a5e9f 100644
>> --- a/arch/arm/include/asm/jump_label.h
>> +++ b/arch/arm/include/asm/jump_label.h
>> @@ -14,7 +14,7 @@
>> #define JUMP_LABEL_NOP "nop"
>> #endif
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm_volatile_goto("1:\n\t"
>> JUMP_LABEL_NOP "\n\t"
>> diff --git a/arch/arm/kernel/jump_label.c b/arch/arm/kernel/jump_label.c
>> index 4ce4f78..9686fce 100644
>> --- a/arch/arm/kernel/jump_label.c
>> +++ b/arch/arm/kernel/jump_label.c
>> @@ -6,7 +6,7 @@
>>
>> #ifdef HAVE_JUMP_LABEL
>>
>> -static void __arch_jump_label_transform(struct jump_entry *entry,
>> +static void __arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type,
>> bool is_static)
>> {
>> @@ -24,13 +24,13 @@ static void __arch_jump_label_transform(struct jump_entry *entry,
>> patch_text(addr, insn);
>> }
>>
>> -void arch_jump_label_transform(struct jump_entry *entry,
>> +void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> __arch_jump_label_transform(entry, type, false);
>> }
>>
>> -void arch_jump_label_transform_static(struct jump_entry *entry,
>> +void arch_jump_label_transform_static(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> __arch_jump_label_transform(entry, type, true);
>> diff --git a/arch/arm64/include/asm/jump_label.h b/arch/arm64/include/asm/jump_label.h
>> index 076a1c7..93ca8b3 100644
>> --- a/arch/arm64/include/asm/jump_label.h
>> +++ b/arch/arm64/include/asm/jump_label.h
>> @@ -25,7 +25,7 @@
>>
>> #define JUMP_LABEL_NOP_SIZE AARCH64_INSN_SIZE
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm goto("1: nop\n\t"
>> ".pushsection __jump_table, \"aw\"\n\t"
>> diff --git a/arch/arm64/kernel/jump_label.c b/arch/arm64/kernel/jump_label.c
>> index 263a166..c30e4ba 100644
>> --- a/arch/arm64/kernel/jump_label.c
>> +++ b/arch/arm64/kernel/jump_label.c
>> @@ -22,7 +22,7 @@
>>
>> #ifdef HAVE_JUMP_LABEL
>>
>> -static void __arch_jump_label_transform(struct jump_entry *entry,
>> +static void __arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type,
>> bool is_static)
>> {
>> @@ -43,13 +43,13 @@ static void __arch_jump_label_transform(struct jump_entry *entry,
>> aarch64_insn_patch_text(&addr, &insn, 1);
>> }
>>
>> -void arch_jump_label_transform(struct jump_entry *entry,
>> +void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> __arch_jump_label_transform(entry, type, false);
>> }
>>
>> -void arch_jump_label_transform_static(struct jump_entry *entry,
>> +void arch_jump_label_transform_static(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> __arch_jump_label_transform(entry, type, true);
>> diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h
>> index e194f95..0ac7892 100644
>> --- a/arch/mips/include/asm/jump_label.h
>> +++ b/arch/mips/include/asm/jump_label.h
>> @@ -20,7 +20,7 @@
>> #define WORD_INSN ".word"
>> #endif
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm_volatile_goto("1:\tnop\n\t"
>> "nop\n\t"
>> diff --git a/arch/mips/kernel/jump_label.c b/arch/mips/kernel/jump_label.c
>> index 6001610..bfba488 100644
>> --- a/arch/mips/kernel/jump_label.c
>> +++ b/arch/mips/kernel/jump_label.c
>> @@ -20,7 +20,7 @@
>>
>> #define J_RANGE_MASK ((1ul << 28) - 1)
>>
>> -void arch_jump_label_transform(struct jump_entry *e,
>> +void arch_jump_label_transform(const struct jump_entry *e,
>> enum jump_label_type type)
>> {
>> union mips_instruction insn;
>> diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h
>> index f016bb6..93eb7c5 100644
>> --- a/arch/powerpc/include/asm/jump_label.h
>> +++ b/arch/powerpc/include/asm/jump_label.h
>> @@ -17,7 +17,7 @@
>> #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG)
>> #define JUMP_LABEL_NOP_SIZE 4
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm_volatile_goto("1:\n\t"
>> "nop\n\t"
>> diff --git a/arch/powerpc/kernel/jump_label.c b/arch/powerpc/kernel/jump_label.c
>> index a1ed8a8..f9626ec 100644
>> --- a/arch/powerpc/kernel/jump_label.c
>> +++ b/arch/powerpc/kernel/jump_label.c
>> @@ -12,7 +12,7 @@
>> #include <asm/code-patching.h>
>>
>> #ifdef HAVE_JUMP_LABEL
>> -void arch_jump_label_transform(struct jump_entry *entry,
>> +void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> u32 *addr = (u32 *)(unsigned long)entry->code;
>> diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h
>> index 346b1c8..9ee8e1b 100644
>> --- a/arch/s390/include/asm/jump_label.h
>> +++ b/arch/s390/include/asm/jump_label.h
>> @@ -13,7 +13,7 @@
>> #define ASM_ALIGN ".balign 4"
>> #endif
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm_volatile_goto("0: brcl 0,0\n"
>> ".pushsection __jump_table, \"aw\"\n"
>> diff --git a/arch/s390/kernel/jump_label.c b/arch/s390/kernel/jump_label.c
>> index b987ab2..15a7c60 100644
>> --- a/arch/s390/kernel/jump_label.c
>> +++ b/arch/s390/kernel/jump_label.c
>> @@ -18,11 +18,11 @@ struct insn {
>> } __packed;
>>
>> struct insn_args {
>> - struct jump_entry *entry;
>> + const const struct jump_entry *entry;
>> enum jump_label_type type;
>> };
>>
>> -static void __jump_label_transform(struct jump_entry *entry,
>> +static void __jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> struct insn insn;
>> @@ -42,15 +42,15 @@ static void __jump_label_transform(struct jump_entry *entry,
>> WARN_ON_ONCE(rc < 0);
>> }
>>
>> -static int __sm_arch_jump_label_transform(void *data)
>> +static int __sm_arch_jump_label_transform(const void *data)
>> {
>> - struct insn_args *args = data;
>> + const struct insn_args *args = data;
>>
>> __jump_label_transform(args->entry, args->type);
>> return 0;
>> }
>>
>> -void arch_jump_label_transform(struct jump_entry *entry,
>> +void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> struct insn_args args;
>> @@ -61,7 +61,7 @@ void arch_jump_label_transform(struct jump_entry *entry,
>> stop_machine(__sm_arch_jump_label_transform, &args, NULL);
>> }
>>
>> -void arch_jump_label_transform_static(struct jump_entry *entry,
>> +void arch_jump_label_transform_static(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> __jump_label_transform(entry, type);
>> diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h
>> index ec2e2e2..4f1f223 100644
>> --- a/arch/sparc/include/asm/jump_label.h
>> +++ b/arch/sparc/include/asm/jump_label.h
>> @@ -7,7 +7,7 @@
>>
>> #define JUMP_LABEL_NOP_SIZE 4
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm_volatile_goto("1:\n\t"
>> "nop\n\t"
>> diff --git a/arch/sparc/kernel/jump_label.c b/arch/sparc/kernel/jump_label.c
>> index 48565c1..231c10e 100644
>> --- a/arch/sparc/kernel/jump_label.c
>> +++ b/arch/sparc/kernel/jump_label.c
>> @@ -10,7 +10,7 @@
>>
>> #ifdef HAVE_JUMP_LABEL
>>
>> -void arch_jump_label_transform(struct jump_entry *entry,
>> +void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> u32 val;
>> diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h
>> index 6a2cefb..329ab91 100644
>> --- a/arch/x86/include/asm/jump_label.h
>> +++ b/arch/x86/include/asm/jump_label.h
>> @@ -16,7 +16,7 @@
>> # define STATIC_KEY_INIT_NOP GENERIC_NOP5_ATOMIC
>> #endif
>>
>> -static __always_inline bool arch_static_branch(struct static_key *key)
>> +static __always_inline bool arch_static_branch(const struct static_key *key)
>> {
>> asm_volatile_goto("1:"
>> ".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t"
>> diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
>> index bf156de..5af9269 100644
>> --- a/arch/x86/include/asm/spinlock.h
>> +++ b/arch/x86/include/asm/spinlock.h
>> @@ -41,7 +41,7 @@
>> #define SPIN_THRESHOLD (1 << 15)
>>
>> extern struct static_key paravirt_ticketlocks_enabled;
>> -static __always_inline bool static_key_false(struct static_key *key);
>> +static __always_inline bool static_key_false(const struct static_key *key);
>>
>> #ifdef CONFIG_PARAVIRT_SPINLOCKS
>>
>> diff --git a/arch/x86/kernel/jump_label.c b/arch/x86/kernel/jump_label.c
>> index 26d5a55..fe1cc9d 100644
>> --- a/arch/x86/kernel/jump_label.c
>> +++ b/arch/x86/kernel/jump_label.c
>> @@ -36,7 +36,7 @@ static void bug_at(unsigned char *ip, int line)
>> BUG();
>> }
>>
>> -static void __jump_label_transform(struct jump_entry *entry,
>> +static void __jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type,
>> void *(*poker)(void *, const void *, size_t),
>> int init)
>> @@ -102,7 +102,7 @@ static void __jump_label_transform(struct jump_entry *entry,
>> (void *)entry->code + JUMP_LABEL_NOP_SIZE);
>> }
>>
>> -void arch_jump_label_transform(struct jump_entry *entry,
>> +void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> get_online_cpus();
>> @@ -118,7 +118,7 @@ static enum {
>> JL_STATE_UPDATE,
>> } jlstate __initdata_or_module = JL_STATE_START;
>>
>> -__init_or_module void arch_jump_label_transform_static(struct jump_entry *entry,
>> +__init_or_module void arch_jump_label_transform_static(const struct jump_entry *entry,
>> enum jump_label_type type)
>> {
>> /*
>> diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
>> index 5c1dfb2..2b2e358 100644
>> --- a/include/linux/jump_label.h
>> +++ b/include/linux/jump_label.h
>> @@ -86,13 +86,14 @@ struct module;
>> #define JUMP_LABEL_TYPE_MASK 1UL
>>
>> static
>> -inline struct jump_entry *jump_label_get_entries(struct static_key *key)
>> +inline const struct jump_entry *jump_label_get_entries(
>> + const struct static_key *key)
>> {
>> return (struct jump_entry *)((unsigned long)key->entries
>> & ~JUMP_LABEL_TYPE_MASK);
>> }
>>
>> -static inline bool jump_label_get_branch_default(struct static_key *key)
>> +static inline bool jump_label_get_branch_default(const struct static_key *key)
>> {
>> if (((unsigned long)key->entries & JUMP_LABEL_TYPE_MASK) ==
>> JUMP_LABEL_TYPE_TRUE_BRANCH)
>> @@ -100,12 +101,12 @@ static inline bool jump_label_get_branch_default(struct static_key *key)
>> return false;
>> }
>>
>> -static __always_inline bool static_key_false(struct static_key *key)
>> +static __always_inline bool static_key_false(const struct static_key *key)
>> {
>> return arch_static_branch(key);
>> }
>>
>> -static __always_inline bool static_key_true(struct static_key *key)
>> +static __always_inline bool static_key_true(const struct static_key *key)
>> {
>> return !static_key_false(key);
>> }
>> @@ -116,14 +117,14 @@ extern struct jump_entry __stop___jump_table[];
>> extern void jump_label_init(void);
>> extern void jump_label_lock(void);
>> extern void jump_label_unlock(void);
>> -extern void arch_jump_label_transform(struct jump_entry *entry,
>> +extern void arch_jump_label_transform(const struct jump_entry *entry,
>> enum jump_label_type type);
>> -extern void arch_jump_label_transform_static(struct jump_entry *entry,
>> +extern void arch_jump_label_transform_static(const struct jump_entry *entry,
>> enum jump_label_type type);
>> -extern int jump_label_text_reserved(void *start, void *end);
>> +extern int jump_label_text_reserved(const void *start, const void *end);
>> extern void static_key_slow_inc(struct static_key *key);
>> extern void static_key_slow_dec(struct static_key *key);
>> -extern void jump_label_apply_nops(struct module *mod);
>> +extern void jump_label_apply_nops(const struct module *mod);
>>
>> #define STATIC_KEY_INIT_TRUE ((struct static_key) \
>> { .enabled = ATOMIC_INIT(1), \
>> @@ -143,14 +144,14 @@ static __always_inline void jump_label_init(void)
>> static_key_initialized = true;
>> }
>>
>> -static __always_inline bool static_key_false(struct static_key *key)
>> +static __always_inline bool static_key_false(const struct static_key *key)
>> {
>> if (unlikely(atomic_read(&key->enabled) > 0))
>> return true;
>> return false;
>> }
>>
>> -static __always_inline bool static_key_true(struct static_key *key)
>> +static __always_inline bool static_key_true(const struct static_key *key)
>> {
>> if (likely(atomic_read(&key->enabled) > 0))
>> return true;
>> @@ -169,7 +170,7 @@ static inline void static_key_slow_dec(struct static_key *key)
>> atomic_dec(&key->enabled);
>> }
>>
>> -static inline int jump_label_text_reserved(void *start, void *end)
>> +static inline int jump_label_text_reserved(const void *start, const void *end)
>> {
>> return 0;
>> }
>> @@ -177,7 +178,7 @@ static inline int jump_label_text_reserved(void *start, void *end)
>> static inline void jump_label_lock(void) {}
>> static inline void jump_label_unlock(void) {}
>>
>> -static inline int jump_label_apply_nops(struct module *mod)
>> +static inline int jump_label_apply_nops(const struct module *mod)
>> {
>> return 0;
>> }
>> @@ -192,7 +193,7 @@ static inline int jump_label_apply_nops(struct module *mod)
>> #define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
>> #define jump_label_enabled static_key_enabled
>>
>> -static inline bool static_key_enabled(struct static_key *key)
>> +static inline bool static_key_enabled(const struct static_key *key)
>> {
>> return (atomic_read(&key->enabled) > 0);
>> }
>> diff --git a/kernel/jump_label.c b/kernel/jump_label.c
>> index 9019f15..6879f48 100644
>> --- a/kernel/jump_label.c
>> +++ b/kernel/jump_label.c
>> @@ -54,7 +54,7 @@ jump_label_sort_entries(struct jump_entry *start, struct jump_entry *stop)
>> sort(start, size, sizeof(struct jump_entry), jump_label_cmp, NULL);
>> }
>>
>> -static void jump_label_update(struct static_key *key, int enable);
>> +static void jump_label_update(const struct static_key *key, int enable);
>>
>> void static_key_slow_inc(struct static_key *key)
>> {
>> @@ -125,7 +125,8 @@ void jump_label_rate_limit(struct static_key_deferred *key,
>> }
>> EXPORT_SYMBOL_GPL(jump_label_rate_limit);
>>
>> -static int addr_conflict(struct jump_entry *entry, void *start, void *end)
>> +static int addr_conflict(const struct jump_entry *entry, const void *start,
>> + const void *end)
>> {
>> if (entry->code <= (unsigned long)end &&
>> entry->code + JUMP_LABEL_NOP_SIZE > (unsigned long)start)
>> @@ -134,10 +135,11 @@ static int addr_conflict(struct jump_entry *entry, void *start, void *end)
>> return 0;
>> }
>>
>> -static int __jump_label_text_reserved(struct jump_entry *iter_start,
>> - struct jump_entry *iter_stop, void *start, void *end)
>> +static int __jump_label_text_reserved(const struct jump_entry *iter_start,
>> + const struct jump_entry *iter_stop, const void *start,
>> + const void *end)
>> {
>> - struct jump_entry *iter;
>> + const struct jump_entry *iter;
>>
>> iter = iter_start;
>> while (iter < iter_stop) {
>> @@ -155,15 +157,15 @@ static int __jump_label_text_reserved(struct jump_entry *iter_start,
>> * running code can override this to make the non-live update case
>> * cheaper.
>> */
>> -void __weak __init_or_module arch_jump_label_transform_static(struct jump_entry *entry,
>> - enum jump_label_type type)
>> +void __weak __init_or_module arch_jump_label_transform_static(
>> + const struct jump_entry *entry, enum jump_label_type type)
>> {
>> arch_jump_label_transform(entry, type);
>> }
>>
>> -static void __jump_label_update(struct static_key *key,
>> - struct jump_entry *entry,
>> - struct jump_entry *stop, int enable)
>> +static void __jump_label_update(const struct static_key *key,
>> + const struct jump_entry *entry,
>> + const struct jump_entry *stop, int enable)
>> {
>> for (; (entry < stop) &&
>> (entry->key == (jump_label_t)(unsigned long)key);
>> @@ -178,7 +180,7 @@ static void __jump_label_update(struct static_key *key,
>> }
>> }
>>
>> -static enum jump_label_type jump_label_type(struct static_key *key)
>> +static enum jump_label_type jump_label_type(const struct static_key *key)
>> {
>> bool true_branch = jump_label_get_branch_default(key);
>> bool state = static_key_enabled(key);
>> @@ -228,9 +230,9 @@ struct static_key_mod {
>> struct module *mod;
>> };
>>
>> -static int __jump_label_mod_text_reserved(void *start, void *end)
>> +static int __jump_label_mod_text_reserved(const void *start, const void *end)
>> {
>> - struct module *mod;
>> + const struct module *mod;
>>
>> mod = __module_text_address((unsigned long)start);
>> if (!mod)
>> @@ -243,12 +245,12 @@ static int __jump_label_mod_text_reserved(void *start, void *end)
>> start, end);
>> }
>>
>> -static void __jump_label_mod_update(struct static_key *key, int enable)
>> +static void __jump_label_mod_update(const struct static_key *key, int enable)
>> {
>> - struct static_key_mod *mod = key->next;
>> + const struct static_key_mod *mod = key->next;
>>
>> while (mod) {
>> - struct module *m = mod->mod;
>> + const struct module *m = mod->mod;
>>
>> __jump_label_update(key, mod->entries,
>> m->jump_entries + m->num_jump_entries,
>> @@ -265,7 +267,7 @@ static void __jump_label_mod_update(struct static_key *key, int enable)
>> * loads patch these with arch_get_jump_label_nop(), which is specified by
>> * the arch specific jump label code.
>> */
>> -void jump_label_apply_nops(struct module *mod)
>> +void jump_label_apply_nops(const struct module *mod)
>> {
>> struct jump_entry *iter_start = mod->jump_entries;
>> struct jump_entry *iter_stop = iter_start + mod->num_jump_entries;
>> @@ -425,7 +427,7 @@ early_initcall(jump_label_init_module);
>> *
>> * returns 1 if there is an overlap, 0 otherwise
>> */
>> -int jump_label_text_reserved(void *start, void *end)
>> +int jump_label_text_reserved(const void *start, const void *end)
>> {
>> int ret = __jump_label_text_reserved(__start___jump_table,
>> __stop___jump_table, start, end);
>> @@ -439,13 +441,13 @@ int jump_label_text_reserved(void *start, void *end)
>> return ret;
>> }
>>
>> -static void jump_label_update(struct static_key *key, int enable)
>> +static void jump_label_update(const struct static_key *key, int enable)
>> {
>> - struct jump_entry *stop = __stop___jump_table;
>> - struct jump_entry *entry = jump_label_get_entries(key);
>> + const struct jump_entry *stop = __stop___jump_table;
>> + const struct jump_entry *entry = jump_label_get_entries(key);
>>
>> #ifdef CONFIG_MODULES
>> - struct module *mod = __module_address((unsigned long)key);
>> + const struct module *mod = __module_address((unsigned long)key);
>>
>> __jump_label_mod_update(key, enable);
>>
>>
>
--
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