Every perf_trace_buf_prepare() caller does
WARN_ONCE(size > PERF_MAX_TRACE_SIZE, message) and "message" is
almost the same.
Shift this WARN_ONCE() into perf_trace_buf_prepare(). This changes
the meaning of _ONCE, but I think this is fine.
- 4947014 2932448 10104832 17984294 1126b26 vmlinux
+ 4948422 2932448 10104832 17985702 11270a6 vmlinux
on my build.
Signed-off-by: Oleg Nesterov <[email protected]>
---
include/trace/ftrace.h | 4 ----
kernel/trace/trace_event_perf.c | 4 ++++
kernel/trace/trace_kprobe.c | 6 ------
kernel/trace/trace_syscalls.c | 12 ------------
kernel/trace/trace_uprobe.c | 2 --
5 files changed, 4 insertions(+), 24 deletions(-)
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 19edd7f..c162a57 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -666,10 +666,6 @@ perf_trace_##call(void *__data, proto)
\
sizeof(u64)); \
__entry_size -= sizeof(u32); \
\
- if (WARN_ONCE(__entry_size > PERF_MAX_TRACE_SIZE, \
- "profile buffer not large enough")) \
- return; \
- \
entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
__entry_size, event_call->event.type, &__regs, &rctx); \
if (!entry) \
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 12df557..80c36bc 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -236,6 +236,10 @@ __kprobes void *perf_trace_buf_prepare(int size, unsigned
short type,
BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(unsigned long));
+ if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
+ "perf buffer not large enough"))
+ return NULL;
+
pc = preempt_count();
*rctxp = perf_swevent_get_recursion_context();
diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index b95f683..156a4d8 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1088,9 +1088,6 @@ kprobe_perf_func(struct trace_probe *tp, struct pt_regs
*regs)
__size = sizeof(*entry) + tp->size + dsize;
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
- "profile buffer not large enough"))
- return;
entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
if (!entry)
@@ -1122,9 +1119,6 @@ kretprobe_perf_func(struct trace_probe *tp, struct
kretprobe_instance *ri,
__size = sizeof(*entry) + tp->size + dsize;
size = ALIGN(__size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
- "profile buffer not large enough"))
- return;
entry = perf_trace_buf_prepare(size, call->event.type, regs, &rctx);
if (!entry)
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 4d1bd5d..d17246e 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -562,10 +562,6 @@ static void perf_syscall_enter(void *ignore, struct
pt_regs *regs, long id)
size = ALIGN(size + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
- "perf buffer not large enough"))
- return;
-
rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size,
sys_data->enter_event->event.type, regs, &rctx);
if (!rec)
@@ -639,14 +635,6 @@ static void perf_syscall_exit(void *ignore, struct pt_regs
*regs, long ret)
size = ALIGN(sizeof(*rec) + sizeof(u32), sizeof(u64));
size -= sizeof(u32);
- /*
- * Impossible, but be paranoid with the future
- * How to put this check outside runtime?
- */
- if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE,
- "exit event has grown above perf buffer size"))
- return;
-
rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size,
sys_data->exit_event->event.type, regs, &rctx);
if (!rec)
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 32494fb..4a32b52 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -816,8 +816,6 @@ static void uprobe_perf_print(struct trace_uprobe *tu,
size = SIZEOF_TRACE_ENTRY(is_ret_probe(tu));
size = ALIGN(size + tu->size + sizeof(u32), sizeof(u64)) - sizeof(u32);
- if (WARN_ONCE(size > PERF_MAX_TRACE_SIZE, "profile buffer not large
enough"))
- return;
preempt_disable();
head = this_cpu_ptr(call->perf_events);
--
1.5.5.1
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