From mboxrd@z Thu Jan 1 00:00:00 1970 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 6B1D81448E6; Mon, 8 Apr 2024 17:49:47 +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=1712598587; cv=none; b=OyiyfGDhPKDKqELKRco6kKtcBFWd5YiRMQibbwWXxdfWO3QMXYy5Jr82bKB4bn9tmezndk/d3VN7JMfneprqJIOwHrYBrf/mu5QjLmeT/+5hElqDP9eEEB2mqzCP7Be5pKELGivNORRKVKggtvk6vF2sHligKI7CxJz44+0NlyI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712598587; c=relaxed/simple; bh=j8VRWv8f9Z0TI0OKN9Nqc6b3Iz1YHbxZqEB3CA0Ino0=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=jpuP8cd/rQIdcalY+gcN1UXzn0R5UhKOBgQUD29bEb9IQ4GKSrgj3as3ieNfo2l+z9/HPZIegb9mQGZevmHwC+9sakVHfDKkc9I1rX0wfVq2GNgDYMbnM0gRhoysEF3rW/RI1kJMaD9b6uEdWyYXcoCHaJ+6QmF7ICJJG0jGFiU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KmluJ250; 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="KmluJ250" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 20185C4167E; Mon, 8 Apr 2024 17:49:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1712598587; bh=j8VRWv8f9Z0TI0OKN9Nqc6b3Iz1YHbxZqEB3CA0Ino0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KmluJ250u1QOwV0yPhaSVHkYqwFzsHPbZmgrE/hnmhuYOXiw3eQItoSzoxtv4OXkm AaP6/CIuMiuf9CMITppcxlAF1cSxbAsmVn88bhe8A9XbGrstSPnk2fdvjH+rv+NOJp M8Fdze4jsAN92tMOIjfgJIlv4S/CekoPJS6dI4voSluN6gq+kruRTIBRicCohM0QIM OIg9e+hxNMONJkYc0KLRVP3qMTguUVw9TNN/PllZ9OPFES7/vW87EOXFQyPBczbXqV Ic71jRbckWFXd/ZEKKIxzuA7hzhMrMryeYEq3wNtWEBSeO4tKhoXugzzgVPImEdg73 wqQ8Px7uRf4XQ== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 5D19BCE2CE0; Mon, 8 Apr 2024 10:49:46 -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, dianders@chromium.org, pmladek@suse.com, torvalds@linux-foundation.org, Arnd Bergmann , "Paul E. McKenney" , Yujie Liu , Andi Shyti , Geert Uytterhoeven Subject: [PATCH cmpxchg 13/14] xtensa: Emulate one-byte cmpxchg Date: Mon, 8 Apr 2024 10:49:43 -0700 Message-Id: <20240408174944.907695-13-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <7b3646e0-667c-48e2-8f09-e493c43c30cb@paulmck-laptop> References: <7b3646e0-667c-48e2-8f09-e493c43c30cb@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-arch@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use the new cmpxchg_emu_u8() to emulate one-byte cmpxchg() on xtensa. [ paulmck: Apply kernel test robot feedback. ] [ paulmck: Drop two-byte support per Arnd Bergmann feedback. ] Signed-off-by: Paul E. McKenney Tested-by: Yujie Liu Cc: Andi Shyti Cc: Geert Uytterhoeven Cc: Arnd Bergmann Cc: "Peter Zijlstra (Intel)" --- arch/xtensa/Kconfig | 1 + arch/xtensa/include/asm/cmpxchg.h | 2 ++ 2 files changed, 3 insertions(+) diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index f200a4ec044e6..d3db28f2f8110 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -14,6 +14,7 @@ config XTENSA select ARCH_HAS_DMA_SET_UNCACHED if MMU select ARCH_HAS_STRNCPY_FROM_USER if !KASAN select ARCH_HAS_STRNLEN_USER + select ARCH_NEED_CMPXCHG_1_EMU select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS diff --git a/arch/xtensa/include/asm/cmpxchg.h b/arch/xtensa/include/asm/cmpxchg.h index 675a11ea8de76..29f8f594d5592 100644 --- a/arch/xtensa/include/asm/cmpxchg.h +++ b/arch/xtensa/include/asm/cmpxchg.h @@ -15,6 +15,7 @@ #include #include +#include /* * cmpxchg @@ -74,6 +75,7 @@ static __inline__ unsigned long __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) { switch (size) { + case 1: return cmpxchg_emu_u8((volatile u8 *)ptr, old, new); case 4: return __cmpxchg_u32(ptr, old, new); default: __cmpxchg_called_with_bad_pointer(); return old; -- 2.40.1