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Thu, 29 Aug 2024 08:47:58 -0700 (PDT) Received: from localhost.localdomain ([46.248.82.114]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a898900f29csm93489466b.64.2024.08.29.08.47.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 29 Aug 2024 08:47:58 -0700 (PDT) From: Uros Bizjak To: netfilter-devel@vger.kernel.org, coreteam@netfilter.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Uros Bizjak Subject: [PATCH v2 1/2] err.h: Add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros Date: Thu, 29 Aug 2024 17:29:31 +0200 Message-ID: <20240829154739.16691-2-ubizjak@gmail.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240829154739.16691-1-ubizjak@gmail.com> References: <20240829154739.16691-1-ubizjak@gmail.com> Precedence: bulk X-Mailing-List: netfilter-devel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add ERR_PTR_PCPU(), PTR_ERR_PCPU() and IS_ERR_PCPU() macros that operate on pointers in the percpu address space. These macros remove the need for (__force void *) function argument casts (to avoid sparse -Wcast-from-as warnings). The patch will also avoid future build errors due to pointer address space mismatch with enabled strict percpu address space checks. Signed-off-by: Uros Bizjak --- include/linux/err.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/include/linux/err.h b/include/linux/err.h index b5d9bb2a2349..a4dacd745fcf 100644 --- a/include/linux/err.h +++ b/include/linux/err.h @@ -41,6 +41,9 @@ static inline void * __must_check ERR_PTR(long error) return (void *) error; } +/* Return the pointer in the percpu address space. */ +#define ERR_PTR_PCPU(error) ((void __percpu *)(unsigned long)ERR_PTR(error)) + /** * PTR_ERR - Extract the error code from an error pointer. * @ptr: An error pointer. @@ -51,6 +54,9 @@ static inline long __must_check PTR_ERR(__force const void *ptr) return (long) ptr; } +/* Read an error pointer from the percpu address space. */ +#define PTR_ERR_PCPU(ptr) (PTR_ERR((const void *)(__force const unsigned long)(ptr))) + /** * IS_ERR - Detect an error pointer. * @ptr: The pointer to check. @@ -61,6 +67,9 @@ static inline bool __must_check IS_ERR(__force const void *ptr) return IS_ERR_VALUE((unsigned long)ptr); } +/* Read an error pointer from the percpu address space. */ +#define IS_ERR_PCPU(ptr) (IS_ERR((const void *)(__force const unsigned long)(ptr))) + /** * IS_ERR_OR_NULL - Detect an error pointer or a null pointer. * @ptr: The pointer to check.