From patchwork Mon Aug 5 19:21:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Paul E. McKenney" X-Patchwork-Id: 13753979 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FBDB15B147; Mon, 5 Aug 2024 19:21:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722885682; cv=none; b=IUmvpxaVF/2MhejuHTRivY22qgJZ3fSTktZQAB+hocxXB5KBhwoL0NH2dnC0u0JskmSx4FOwGVomInfF4QxGez3xC/r5dcgjIpkHCkYmYE8+hRxdI1B4/kzNkM5TIH/NAkDfRCMLtiTLIzRdVny0nolPg831FPvJXlJXlhBVcBc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722885682; c=relaxed/simple; bh=rHLBTLGCozsc8ZYyoVtgXgyWtG7mLnt/2HwV6ku00sk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=t8mh2dJz5TEx+PVv4XNB0rF72kgt8E4YH8oDRngghesuIKz/P6yaOX9GhWtdAUailQ36btjhKqOUVzMfAFGJKhZdbuTeOaV2/eUd+czVZ4JEu9SjrsamKalR4trLsxIhpOVuLnPOhO4/z0EgQOc7cqj7jrVlwu8g+qbJEvgATaM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=JeZmvV35; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="JeZmvV35" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ACF64C4AF0E; Mon, 5 Aug 2024 19:21:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722885681; bh=rHLBTLGCozsc8ZYyoVtgXgyWtG7mLnt/2HwV6ku00sk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JeZmvV35UmDfaPr6trM/HZwiyXgBBYiM79k8hwahfN7zysawZ9ZqeljXBeibBxhTW XmZ9krPGcFEJSs02cDDOTWMyZaSRF7znUDHVev751sJP0Gv5Td6hPaXpo+hdRa6EyB 5yuvlDFujJRFq97YX050Lb3StOqrAPuPbgKchfcTNY5az670n41g+A3MhzgD3p3TgV LSkTsnSq9XxjrehqV/uoL5inxzoPMRQsSfLRdZErvkfBpWnqKK/HFzqcgXxjreH/hs gShiXwGHYVqWM8a5NnGHyjoTrn6zX/ubBKFaYnIOFb9aYMfniRuOSfOnGj4/V90E4B JLUUqZiU5AaXg== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 50378CE10F9; Mon, 5 Aug 2024 12:21:21 -0700 (PDT) From: "Paul E. McKenney" To: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org Cc: elver@google.com, akpm@linux-foundation.org, tglx@linutronix.de, peterz@infradead.org, torvalds@linux-foundation.org, arnd@arndb.de, geert@linux-m68k.org, palmer@rivosinc.com, mhiramat@kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, "Paul E. McKenney" , Andi Shyti Subject: [PATCH cmpxchg 3/3] sh: Emulate one-byte cmpxchg Date: Mon, 5 Aug 2024 12:21:19 -0700 Message-Id: <20240805192119.56816-3-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on sh. [ paulmck: Drop two-byte support per Arnd Bergmann feedback. ] [ paulmck: Apply feedback from Naresh Kamboju. ] [ Apply Geert Uytterhoeven feedback. ] Signed-off-by: Paul E. McKenney Cc: Andi Shyti Cc: Palmer Dabbelt Cc: Masami Hiramatsu Cc: Arnd Bergmann Cc: Acked-by: John Paul Adrian Glaubitz --- arch/sh/Kconfig | 1 + arch/sh/include/asm/cmpxchg.h | 3 +++ 2 files changed, 4 insertions(+) diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 1aa3c4a0c5b27..e9103998cca91 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -14,6 +14,7 @@ config SUPERH select ARCH_HIBERNATION_POSSIBLE if MMU select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_WANT_IPC_PARSE_VERSION + select ARCH_NEED_CMPXCHG_1_EMU select CPU_NO_EFFICIENT_FFS select DMA_DECLARE_COHERENT select GENERIC_ATOMIC64 diff --git a/arch/sh/include/asm/cmpxchg.h b/arch/sh/include/asm/cmpxchg.h index 5d617b3ef78f7..1e5dc5ccf7bf5 100644 --- a/arch/sh/include/asm/cmpxchg.h +++ b/arch/sh/include/asm/cmpxchg.h @@ -9,6 +9,7 @@ #include #include +#include #if defined(CONFIG_GUSA_RB) #include @@ -56,6 +57,8 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old, unsigned long new, int size) { switch (size) { + case 1: + return cmpxchg_emu_u8(ptr, old, new); case 4: return __cmpxchg_u32(ptr, old, new); }