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From:   Arnd Bergmann <arnd@kernel.org>
To:     Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Jiri Olsa <jolsa@redhat.com>
Cc:     Arnd Bergmann <arnd@arndb.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        Martin KaFai Lau <kafai@fb.com>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Florent Revest <revest@chromium.org>,
        Alan Maguire <alan.maguire@oracle.com>, netdev@vger.kernel.org,
        bpf@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH net-next] bpf: fix pointer cast warning
Date:   Wed, 21 Jul 2021 23:19:45 +0200
Message-Id: <20210721212007.3876595-1-arnd@kernel.org>
MIME-Version: 1.0
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From: Arnd Bergmann <arnd@arndb.de>

kp->addr is a pointer, so it cannot be cast directly to a 'u64'
when it gets interpreted as an integer value:

kernel/trace/bpf_trace.c: In function '____bpf_get_func_ip_kprobe':
kernel/trace/bpf_trace.c:968:21: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
  968 |         return kp ? (u64) kp->addr : 0;

Use the uintptr_t type instead.

Fixes: 9ffd9f3ff719 ("bpf: Add bpf_get_func_ip helper for kprobe programs")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 kernel/trace/bpf_trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 0de09f068697..a428d1ef0085 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -965,7 +965,7 @@ BPF_CALL_1(bpf_get_func_ip_kprobe, struct pt_regs *, regs)
 {
 	struct kprobe *kp = kprobe_running();
 
-	return kp ? (u64) kp->addr : 0;
+	return kp ? (uintptr_t)kp->addr : 0;
 }
 
 static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = {
-- 
2.29.2