Commit 76b235c6 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}

Since we've already stepped away from ENABLE is a JMP and DISABLE is a
NOP with the branch_default bits, and are going to make it even worse,
rename it to make it all clearer.

This way we don't mix multiple levels of logic attributes, but have a
plain 'physical' name for what the current instruction patching status
of a jump label is.

This is a first step in removing the naming confusion that has led to
a stream of avoidable bugs such as:

  a833581e ("x86, perf: Fix static_key bug in load_mm_cr4()")
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
[ Beefed up the changelog. ]
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent f320ead7
...@@ -12,7 +12,7 @@ static void __arch_jump_label_transform(struct jump_entry *entry, ...@@ -12,7 +12,7 @@ static void __arch_jump_label_transform(struct jump_entry *entry,
void *addr = (void *)entry->code; void *addr = (void *)entry->code;
unsigned int insn; unsigned int insn;
if (type == JUMP_LABEL_ENABLE) if (type == JUMP_LABEL_JMP)
insn = arm_gen_branch(entry->code, entry->target); insn = arm_gen_branch(entry->code, entry->target);
else else
insn = arm_gen_nop(); insn = arm_gen_nop();
......
...@@ -28,7 +28,7 @@ void arch_jump_label_transform(struct jump_entry *entry, ...@@ -28,7 +28,7 @@ void arch_jump_label_transform(struct jump_entry *entry,
void *addr = (void *)entry->code; void *addr = (void *)entry->code;
u32 insn; u32 insn;
if (type == JUMP_LABEL_ENABLE) { if (type == JUMP_LABEL_JMP) {
insn = aarch64_insn_gen_branch_imm(entry->code, insn = aarch64_insn_gen_branch_imm(entry->code,
entry->target, entry->target,
AARCH64_INSN_BRANCH_NOLINK); AARCH64_INSN_BRANCH_NOLINK);
......
...@@ -51,7 +51,7 @@ void arch_jump_label_transform(struct jump_entry *e, ...@@ -51,7 +51,7 @@ void arch_jump_label_transform(struct jump_entry *e,
/* Target must have the right alignment and ISA must be preserved. */ /* Target must have the right alignment and ISA must be preserved. */
BUG_ON((e->target & J_ALIGN_MASK) != J_ISA_BIT); BUG_ON((e->target & J_ALIGN_MASK) != J_ISA_BIT);
if (type == JUMP_LABEL_ENABLE) { if (type == JUMP_LABEL_JMP) {
insn.j_format.opcode = J_ISA_BIT ? mm_j32_op : j_op; insn.j_format.opcode = J_ISA_BIT ? mm_j32_op : j_op;
insn.j_format.target = e->target >> J_RANGE_SHIFT; insn.j_format.target = e->target >> J_RANGE_SHIFT;
} else { } else {
......
...@@ -17,7 +17,7 @@ void arch_jump_label_transform(struct jump_entry *entry, ...@@ -17,7 +17,7 @@ void arch_jump_label_transform(struct jump_entry *entry,
{ {
u32 *addr = (u32 *)(unsigned long)entry->code; u32 *addr = (u32 *)(unsigned long)entry->code;
if (type == JUMP_LABEL_ENABLE) if (type == JUMP_LABEL_JMP)
patch_branch(addr, entry->target, 0); patch_branch(addr, entry->target, 0);
else else
patch_instruction(addr, PPC_INST_NOP); patch_instruction(addr, PPC_INST_NOP);
......
...@@ -64,7 +64,7 @@ static void __jump_label_transform(struct jump_entry *entry, ...@@ -64,7 +64,7 @@ static void __jump_label_transform(struct jump_entry *entry,
{ {
struct insn old, new; struct insn old, new;
if (type == JUMP_LABEL_ENABLE) { if (type == JUMP_LABEL_JMP) {
jump_label_make_nop(entry, &old); jump_label_make_nop(entry, &old);
jump_label_make_branch(entry, &new); jump_label_make_branch(entry, &new);
} else { } else {
......
...@@ -16,7 +16,7 @@ void arch_jump_label_transform(struct jump_entry *entry, ...@@ -16,7 +16,7 @@ void arch_jump_label_transform(struct jump_entry *entry,
u32 val; u32 val;
u32 *insn = (u32 *) (unsigned long) entry->code; u32 *insn = (u32 *) (unsigned long) entry->code;
if (type == JUMP_LABEL_ENABLE) { if (type == JUMP_LABEL_JMP) {
s32 off = (s32)entry->target - (s32)entry->code; s32 off = (s32)entry->target - (s32)entry->code;
#ifdef CONFIG_SPARC64 #ifdef CONFIG_SPARC64
......
...@@ -45,7 +45,7 @@ static void __jump_label_transform(struct jump_entry *entry, ...@@ -45,7 +45,7 @@ static void __jump_label_transform(struct jump_entry *entry,
const unsigned char default_nop[] = { STATIC_KEY_INIT_NOP }; const unsigned char default_nop[] = { STATIC_KEY_INIT_NOP };
const unsigned char *ideal_nop = ideal_nops[NOP_ATOMIC5]; const unsigned char *ideal_nop = ideal_nops[NOP_ATOMIC5];
if (type == JUMP_LABEL_ENABLE) { if (type == JUMP_LABEL_JMP) {
if (init) { if (init) {
/* /*
* Jump label is enabled for the first time. * Jump label is enabled for the first time.
......
...@@ -86,8 +86,8 @@ struct static_key { ...@@ -86,8 +86,8 @@ struct static_key {
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
enum jump_label_type { enum jump_label_type {
JUMP_LABEL_DISABLE = 0, JUMP_LABEL_NOP = 0,
JUMP_LABEL_ENABLE, JUMP_LABEL_JMP,
}; };
struct module; struct module;
......
...@@ -65,9 +65,9 @@ void static_key_slow_inc(struct static_key *key) ...@@ -65,9 +65,9 @@ void static_key_slow_inc(struct static_key *key)
jump_label_lock(); jump_label_lock();
if (atomic_read(&key->enabled) == 0) { if (atomic_read(&key->enabled) == 0) {
if (!jump_label_get_branch_default(key)) if (!jump_label_get_branch_default(key))
jump_label_update(key, JUMP_LABEL_ENABLE); jump_label_update(key, JUMP_LABEL_JMP);
else else
jump_label_update(key, JUMP_LABEL_DISABLE); jump_label_update(key, JUMP_LABEL_NOP);
} }
atomic_inc(&key->enabled); atomic_inc(&key->enabled);
jump_label_unlock(); jump_label_unlock();
...@@ -88,9 +88,9 @@ static void __static_key_slow_dec(struct static_key *key, ...@@ -88,9 +88,9 @@ static void __static_key_slow_dec(struct static_key *key,
schedule_delayed_work(work, rate_limit); schedule_delayed_work(work, rate_limit);
} else { } else {
if (!jump_label_get_branch_default(key)) if (!jump_label_get_branch_default(key))
jump_label_update(key, JUMP_LABEL_DISABLE); jump_label_update(key, JUMP_LABEL_NOP);
else else
jump_label_update(key, JUMP_LABEL_ENABLE); jump_label_update(key, JUMP_LABEL_JMP);
} }
jump_label_unlock(); jump_label_unlock();
} }
...@@ -184,9 +184,9 @@ static enum jump_label_type jump_label_type(struct static_key *key) ...@@ -184,9 +184,9 @@ static enum jump_label_type jump_label_type(struct static_key *key)
bool state = static_key_enabled(key); bool state = static_key_enabled(key);
if ((!true_branch && state) || (true_branch && !state)) if ((!true_branch && state) || (true_branch && !state))
return JUMP_LABEL_ENABLE; return JUMP_LABEL_JMP;
return JUMP_LABEL_DISABLE; return JUMP_LABEL_NOP;
} }
void __init jump_label_init(void) void __init jump_label_init(void)
...@@ -276,7 +276,7 @@ void jump_label_apply_nops(struct module *mod) ...@@ -276,7 +276,7 @@ void jump_label_apply_nops(struct module *mod)
return; return;
for (iter = iter_start; iter < iter_stop; iter++) { for (iter = iter_start; iter < iter_stop; iter++) {
arch_jump_label_transform_static(iter, JUMP_LABEL_DISABLE); arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
} }
} }
...@@ -318,8 +318,8 @@ static int jump_label_add_module(struct module *mod) ...@@ -318,8 +318,8 @@ static int jump_label_add_module(struct module *mod)
jlm->next = key->next; jlm->next = key->next;
key->next = jlm; key->next = jlm;
if (jump_label_type(key) == JUMP_LABEL_ENABLE) if (jump_label_type(key) == JUMP_LABEL_JMP)
__jump_label_update(key, iter, iter_stop, JUMP_LABEL_ENABLE); __jump_label_update(key, iter, iter_stop, JUMP_LABEL_JMP);
} }
return 0; return 0;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment