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Mon, 21 Oct 2024 01:09:00 -0700 (PDT) Received: from fedora.iskraemeco.si ([193.77.86.230]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a9a913706a7sm175925366b.141.2024.10.21.01.08.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Oct 2024 01:08:59 -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 1/3] percpu: Merge VERIFY_PERCPU_PTR() into its only user Date: Mon, 21 Oct 2024 10:07:36 +0200 Message-ID: <20241021080856.48746-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.47.0 MIME-Version: 1.0 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: B4B8E4000E X-Stat-Signature: q5wox6twnphejwdbb7memqkquc8xpcw6 X-HE-Tag: 1729498131-22086 X-HE-Meta: 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 BMDBdF5S 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Merge VERIFY_PERCPU_PTR() into non-CONFIG_SMP per_cpu_ptr() to make macro similar to CONFIG_SMP per_cpu_ptr(). This will allow a follow-up patch to refactor common code to a macro. No functional changes, non-CONFIG_SMP per_cpu_ptr() was the only user of VERIFY_PERCPU_PTR(). Signed-off-by: Uros Bizjak Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: Andrew Morton --- include/linux/percpu-defs.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h index 8efce7414fad..7fa88c5f4b26 100644 --- a/include/linux/percpu-defs.h +++ b/include/linux/percpu-defs.h @@ -254,13 +254,13 @@ do { \ #else /* CONFIG_SMP */ -#define VERIFY_PERCPU_PTR(__p) \ +#define per_cpu_ptr(ptr, cpu) \ ({ \ - __verify_pcpu_ptr(__p); \ - (typeof(*(__p)) __kernel __force *)(__p); \ + (void)(cpu); \ + __verify_pcpu_ptr(ptr); \ + (typeof(*(ptr)) __kernel __force *)(ptr); \ }) -#define per_cpu_ptr(ptr, cpu) ({ (void)(cpu); VERIFY_PERCPU_PTR(ptr); }) #define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0) #define this_cpu_ptr(ptr) raw_cpu_ptr(ptr) From patchwork Mon Oct 21 08:07:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Uros Bizjak X-Patchwork-Id: 13843713 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A9ACD0E6C7 for ; 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Mon, 21 Oct 2024 01:09:00 -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 01:09:00 -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 2/3] percpu: Introduce PERCPU_PTR() macro Date: Mon, 21 Oct 2024 10:07:37 +0200 Message-ID: <20241021080856.48746-2-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: 7AAA518000A X-Stat-Signature: n1x1gn78q8kxyzb4xrtubn5irw677orq X-HE-Tag: 1729498133-399788 X-HE-Meta: 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 dXAXrZii 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce PERCPU_PTR() macro to cast the percpu pointer from the percpu address space to a generic (kernel) address space. Use it in per_cpu_ptr() and related SHIFT_PERCPU_PTR() macros. Also remove common knowledge from SHIFT_PERCPU_PTR() comment, "weird cast" is just a standard way to inform sparse of a cast from the percpu address space to a generic address space. Signed-off-by: Uros Bizjak Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter Cc: Andrew Morton --- include/linux/percpu-defs.h | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/include/linux/percpu-defs.h b/include/linux/percpu-defs.h index 7fa88c5f4b26..e1cf7982424f 100644 --- a/include/linux/percpu-defs.h +++ b/include/linux/percpu-defs.h @@ -220,15 +220,17 @@ do { \ (void)__vpp_verify; \ } while (0) +#define PERCPU_PTR(__p) \ + (typeof(*(__p)) __force __kernel *)(__p); + #ifdef CONFIG_SMP /* - * Add an offset to a pointer but keep the pointer as-is. Use RELOC_HIDE() - * to prevent the compiler from making incorrect assumptions about the - * pointer value. The weird cast keeps both GCC and sparse happy. + * Add an offset to a pointer. Use RELOC_HIDE() to prevent the compiler + * from making incorrect assumptions about the pointer value. */ #define SHIFT_PERCPU_PTR(__p, __offset) \ - RELOC_HIDE((typeof(*(__p)) __kernel __force *)(__p), (__offset)) + RELOC_HIDE(PERCPU_PTR(__p), (__offset)) #define per_cpu_ptr(ptr, cpu) \ ({ \ @@ -258,7 +260,7 @@ do { \ ({ \ (void)(cpu); \ __verify_pcpu_ptr(ptr); \ - (typeof(*(ptr)) __kernel __force *)(ptr); \ + PERCPU_PTR(ptr); \ }) #define raw_cpu_ptr(ptr) per_cpu_ptr(ptr, 0) From patchwork Mon Oct 21 08:07:38 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Uros Bizjak X-Patchwork-Id: 13843714 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 01756D0E6C1 for ; Mon, 21 Oct 2024 08:09:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D64CE6B0092; 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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