[PATCH -tip v11 11/27] kprobes: Use bool type for functions which returns boolean value

Masami Hiramatsu
2021-09-14T14:40:16Z

Use the 'bool' type instead of 'int' for the functions which
returns a boolean value, because this makes clear that those
functions don't return any error code.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
Changes in v2:
- Fix trace_kprobe's kprobe_gone() too.
---
include/linux/kprobes.h | 8 ++++----
kernel/kprobes.c | 26 +++++++++++++-------------
kernel/trace/trace_kprobe.c | 2 +-
3 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 6a5995f334a0..0ba3f9e316d4 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -104,25 +104,25 @@ struct kprobe {
#define KPROBE_FLAG_FTRACE 8 /* probe is using ftrace */

/* Has this kprobe gone ? */
-static inline int kprobe_gone(struct kprobe *p)
+static inline bool kprobe_gone(struct kprobe *p)
{
return p->flags & KPROBE_FLAG_GONE;
}

/* Is this kprobe disabled ? */
-static inline int kprobe_disabled(struct kprobe *p)
+static inline bool kprobe_disabled(struct kprobe *p)
{
return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
}

/* Is this kprobe really running optimized path ? */
-static inline int kprobe_optimized(struct kprobe *p)
+static inline bool kprobe_optimized(struct kprobe *p)
{
return p->flags & KPROBE_FLAG_OPTIMIZED;
}

/* Is this kprobe uses ftrace ? */
-static inline int kprobe_ftrace(struct kprobe *p)
+static inline bool kprobe_ftrace(struct kprobe *p)
{
return p->flags & KPROBE_FLAG_FTRACE;
}
diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index b6f1dcf4bff3..8021bccb7770 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -198,8 +198,8 @@ kprobe_opcode_t *__get_insn_slot(struct kprobe_insn_cache *c)
return slot;
}

-/* Return 1 if all garbages are collected, otherwise 0. */
-static int collect_one_slot(struct kprobe_insn_page *kip, int idx)
+/* Return true if all garbages are collected, otherwise false. */
+static bool collect_one_slot(struct kprobe_insn_page *kip, int idx)
{
kip->slot_used[idx] = SLOT_CLEAN;
kip->nused--;
@@ -223,9 +223,9 @@ static int collect_one_slot(struct kprobe_insn_page *kip, int idx)
kip->cache->free(kip->insns);
kfree(kip);
}
- return 1;
+ return true;
}
- return 0;
+ return false;
}

static int collect_garbage_slots(struct kprobe_insn_cache *c)
@@ -389,13 +389,13 @@ NOKPROBE_SYMBOL(get_kprobe);
static int aggr_pre_handler(struct kprobe *p, struct pt_regs *regs);

/* Return true if 'p' is an aggregator */
-static inline int kprobe_aggrprobe(struct kprobe *p)
+static inline bool kprobe_aggrprobe(struct kprobe *p)
{
return p->pre_handler = aggr_pre_handler;
}

/* Return true if 'p' is unused */
-static inline int kprobe_unused(struct kprobe *p)
+static inline bool kprobe_unused(struct kprobe *p)
{
return kprobe_aggrprobe(p) && kprobe_disabled(p) &&
list_empty(&p->list);
@@ -455,7 +455,7 @@ static inline int kprobe_optready(struct kprobe *p)
}

/* Return true if the kprobe is disarmed. Note: p must be on hash list */
-static inline int kprobe_disarmed(struct kprobe *p)
+static inline bool kprobe_disarmed(struct kprobe *p)
{
struct optimized_kprobe *op;

@@ -469,16 +469,16 @@ static inline int kprobe_disarmed(struct kprobe *p)
}

/* Return true if the probe is queued on (un)optimizing lists */
-static int kprobe_queued(struct kprobe *p)
+static bool kprobe_queued(struct kprobe *p)
{
struct optimized_kprobe *op;

if (kprobe_aggrprobe(p)) {
op = container_of(p, struct optimized_kprobe, kp);
if (!list_empty(&op->list))
- return 1;
+ return true;
}
- return 0;
+ return false;
}

/*
@@ -1678,7 +1678,7 @@ int register_kprobe(struct kprobe *p)
EXPORT_SYMBOL_GPL(register_kprobe);

/* Check if all probes on the 'ap' are disabled. */
-static int aggr_kprobe_disabled(struct kprobe *ap)
+static bool aggr_kprobe_disabled(struct kprobe *ap)
{
struct kprobe *kp;

@@ -1690,9 +1690,9 @@ static int aggr_kprobe_disabled(struct kprobe *ap)
* Since there is an active probe on the list,
* we can't disable this 'ap'.
*/
- return 0;
+ return false;

- return 1;
+ return true;
}

static struct kprobe *__disable_kprobe(struct kprobe *p)
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 3a64ba4bbad6..0e1e7ce5f7ed 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -97,7 +97,7 @@ static nokprobe_inline unsigned long trace_kprobe_offset(struct trace_kprobe *tk

static nokprobe_inline bool trace_kprobe_has_gone(struct trace_kprobe *tk)
{
- return !!(kprobe_gone(&tk->rp.kp));
+ return kprobe_gone(&tk->rp.kp);
}

static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk,