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From cdfa74f35910421e807d7e1deb212a5bca138413 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Mauricio=20V=C3=A1squez?= <mauricio@kinvolk.io>
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Date: Thu, 21 May 2020 11:50:52 -0500
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Subject: [PATCH 1/3] Fix KFUNC_PROBE return value
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The KFUNC_PROBE macro is using "void" as return type, this is causing problems
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in some tools that have a filtering enable that returns 0.
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Reproducer: (Notice that it requires BTF support)
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```
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$ python opensnoop.py --pid 5
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/virtual/main.c:33:21: error: void function '____kretfunc__do_sys_open' should not return a value [-Wreturn-type]
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if (pid != 5) { return 0; }
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^ ~
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1 error generated.
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...
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```
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Signed-off-by: Mauricio Vásquez <mauricio@kinvolk.io>
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---
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src/cc/export/helpers.h | 4 ++--
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tools/klockstat.py | 6 +++---
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tools/opensnoop.py | 2 ++
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3 files changed, 7 insertions(+), 5 deletions(-)
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diff --git a/src/cc/export/helpers.h b/src/cc/export/helpers.h
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index b38b3f20..c6edc9cd 100644
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--- a/src/cc/export/helpers.h
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+++ b/src/cc/export/helpers.h
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@@ -998,7 +998,7 @@ int raw_tracepoint__##event(struct bpf_raw_tracepoint_args *ctx)
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#define BPF_PROG(name, args...) \
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int name(unsigned long long *ctx); \
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__attribute__((always_inline)) \
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-static void ____##name(unsigned long long *ctx, ##args); \
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+static int ____##name(unsigned long long *ctx, ##args); \
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int name(unsigned long long *ctx) \
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{ \
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_Pragma("GCC diagnostic push") \
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@@ -1007,7 +1007,7 @@ int name(unsigned long long *ctx) \
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_Pragma("GCC diagnostic pop") \
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return 0; \
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} \
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-static void ____##name(unsigned long long *ctx, ##args)
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+static int ____##name(unsigned long long *ctx, ##args)
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#define KFUNC_PROBE(event, args...) \
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BPF_PROG(kfunc__ ## event, args)
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diff --git a/tools/klockstat.py b/tools/klockstat.py
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index 540dd4e7..7cb15ad3 100755
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--- a/tools/klockstat.py
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+++ b/tools/klockstat.py
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@@ -352,17 +352,17 @@ int mutex_lock_enter(struct pt_regs *ctx)
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program_kfunc = """
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KFUNC_PROBE(mutex_unlock, void *lock)
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{
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- do_mutex_unlock_enter();
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+ return do_mutex_unlock_enter();
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}
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KRETFUNC_PROBE(mutex_lock, void *lock, int ret)
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{
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- do_mutex_lock_return();
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+ return do_mutex_lock_return();
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}
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KFUNC_PROBE(mutex_lock, void *lock)
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{
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- do_mutex_lock_enter(ctx, 3);
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+ return do_mutex_lock_enter(ctx, 3);
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}
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"""
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diff --git a/tools/opensnoop.py b/tools/opensnoop.py
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index b28d7d55..9a526625 100755
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--- a/tools/opensnoop.py
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+++ b/tools/opensnoop.py
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@@ -197,6 +197,8 @@ KRETFUNC_PROBE(do_sys_open, int dfd, const char *filename, int flags, int mode,
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data.ret = ret;
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events.perf_submit(ctx, &data, sizeof(data));
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+
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+ return 0:
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}
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"""
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--
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2.25.4
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