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Mon, 21 Oct 2024 01:09:03 -0700 (PDT) Received: from fedora.iskraemeco.si ([193.77.86.230]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9a913706a7sm175925366b.141.2024.10.21.01.09.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Oct 2024 01:09:01 -0700 (PDT) From: Uros Bizjak To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: Uros Bizjak , Dennis Zhou , Tejun Heo , Christoph Lameter , Andrew Morton Subject: [PATCH 3/3] percpu: Cast percpu pointer in PERCPU_PTR() via unsigned long Date: Mon, 21 Oct 2024 10:07:38 +0200 Message-ID: <20241021080856.48746-3-ubizjak@gmail.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241021080856.48746-1-ubizjak@gmail.com> References: <20241021080856.48746-1-ubizjak@gmail.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 1470012000E X-Stat-Signature: 55nwkr3rhy1hf5jww3kxyo1xxo6xyds9 X-HE-Tag: 1729498125-950717 X-HE-Meta: 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 yq5M6O4Y 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Cast pointer from percpu address space to generic (kernel) address space in PERCPU_PTR() macro via unsigned long intermediate cast [1]. This intermediate cast is also required to avoid build failure when GCC's strict named address space checks for x86 targets [2] are enabled. Found by GCC's named address space checks. [1] https://sparse.docs.kernel.org/en/latest/annotations.html#address-space-name [2] https://gcc.gnu.org/onlinedocs/gcc/Named-Address-Spaces.html#x86-Named-Address-Spaces Signed-off-by: Uros Bizjak Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: Andrew Morton --- include/linux/percpu-defs.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h index e1cf7982424f..35842d1e3879 100644 --- a/include/linux/percpu-defs.h +++ b/include/linux/percpu-defs.h @@ -221,7 +221,10 @@ do { \ } while (0) #define PERCPU_PTR(__p) \ - (typeof(*(__p)) __force __kernel *)(__p); +({ \ + unsigned long __pcpu_ptr = (__force unsigned long)(__p); \ + (typeof(*(__p)) __force __kernel *)(__pcpu_ptr); \ +}) #ifdef CONFIG_SMP