linux-kernel - [PATCH bpf] bpf: update bpf_get_smp_processor

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Message-Id: <20210914222306.52522-1-mcroce@linux.microsoft.com>
Date:   Wed, 15 Sep 2021 00:23:06 +0200
From:   Matteo Croce <mcroce@...ux.microsoft.com>
To:     bpf@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: [PATCH bpf] bpf: update bpf_get_smp_processor_id() documentation

From: Matteo Croce <mcroce@...rosoft.com>

Since commit 1e6c62a88215 ("bpf: Introduce sleepable BPF programs"), BPF
programs can sleep if the BPF_F_SLEEPABLE flag is set.
Update the documentation accordingly.

Fixes: 1e6c62a88215 ("bpf: Introduce sleepable BPF programs")
Signed-off-by: Matteo Croce <mcroce@...rosoft.com>
---
 include/uapi/linux/bpf.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index d21326558d42..5e3b2fb62d84 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -1629,9 +1629,9 @@ union bpf_attr {
  * u32 bpf_get_smp_processor_id(void)
  * 	Description
  * 		Get the SMP (symmetric multiprocessing) processor id. Note that
- * 		all programs run with preemption disabled, which means that the
- * 		SMP processor id is stable during all the execution of the
- * 		program.
+ * 		programs run with preemption disabled unless BPF_F_SLEEPABLE is
+ * 		set, which means that the SMP processor id is stable during all
+ * 		the execution of the program.
  * 	Return
  * 		The SMP id of the processor running the program.
  *
-- 
2.31.1