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Thu, 13 Aug 2026 12:34:19 -0700 (PDT) Received: from localhost ([2a03:2880:21ff:44::]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7f3c974c65esm2916051a34.0.2026.08.13.12.34.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Aug 2026 12:34:19 -0700 (PDT) From: Wei Wang To: daniel.zahka@gmail.com, kuba@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Wei Wang , kernel test robot Subject: [PATCH net] psp: use unrcu_pointer() for the cmpxchg() on netdev psp_dev Date: Thu, 13 Aug 2026 12:34:16 -0700 Message-ID: <20260813193416.1544518-1-weibunny.kernel@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Wei Wang sparse reports: net/psp/psp_nl.c:513:13: sparse: sparse: cast removes address space '__rcu' of expression cmpxchg() returns typeof(*ptr) and its internal casts strip the __rcu annotation. Wrap it in unrcu_pointer(), the documented way to use an __rcu pointer with xchg() and friends. This was introduced by commit 06c2dce2d0f6 ("psp: add new netlink cmd for dev-assoc and dev-disassoc"). No functional change intended. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202608080910.l9KvOH7O-lkp@intel.com/ Signed-off-by: Wei Wang --- net/psp/psp_nl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/psp/psp_nl.c b/net/psp/psp_nl.c index 43b066353c65..f91665748dde 100644 --- a/net/psp/psp_nl.c +++ b/net/psp/psp_nl.c @@ -533,7 +533,8 @@ int psp_nl_dev_assoc_doit(struct sk_buff *skb, struct genl_info *info) } /* Check if device is already associated with a PSP device */ - if (cmpxchg(&assoc_dev->psp_dev, NULL, RCU_INITIALIZER(psd))) { + if (unrcu_pointer(cmpxchg(&assoc_dev->psp_dev, NULL, + RCU_INITIALIZER(psd)))) { NL_SET_ERR_MSG(info->extack, "Device already associated with a PSP device"); err = -EBUSY; -- 2.53.0-Meta