From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8ADA8C3DA7F for ; Mon, 5 Aug 2024 19:21:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=27c79N3ry28a672l1TAuZR57OdSQLXid7rQ0KLuhbl0=; b=3zpbizqPrsoqfM MN2KYUD2cxUN1Pa1m2KQP8G2gLDFUgxGZJ1rkOZ3R7OwcQqOPJfKghnkzOkNHsLGZWBGFOuiYDO8u WLKohaVrLmzVdbgToucJ0vjwZ+zzkg2m9TKVGQrKoibJnh8wYgW5G1FiAECEPiQG3gGO19TlTMfdv LwYUv26J0X9o66tpuP/C7KwsAdPskmWbrRWXVe+7EecgTXLaQ7LmkY8O5Y1CPFK3naop/ROOR6WVE VXxs5z4BnULG5fuzdvOqFzui6CanYmVa6obClL1PGagDGuStHWlUP2uTrXpFROIWYRNv1Bybq43Vj FaCBjSsqeTWhN8bl3pTw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sb3Gp-0000000GzSc-19t2; Mon, 05 Aug 2024 19:21:27 +0000 Received: from sin.source.kernel.org ([145.40.73.55]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sb3Gm-0000000GzQM-0I9Z for linux-snps-arc@lists.infradead.org; Mon, 05 Aug 2024 19:21:26 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sin.source.kernel.org (Postfix) with ESMTP id 59BF5CE009F; Mon, 5 Aug 2024 19:21:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C592C32782; 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=SsfSYlvMJfbrFJhxWSLRoEWcjcncMnxVxwE9E1US2+0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZairQtTnGfrM8IsiBq71qJecW1kAYKoiw1mpOCVFzhcp0z+L0X8x1VjPgRNexVi6f 8dNooCLXYg89HV1K9eqYdLHzBidYZwlAOEMNXFkTC7Op4DmGfpDSo5sQPUiEdQif2B oU0qTkenvvqwDkugiHSAdwpzafTmDvT1HKSZxk6Lc9+HOKS2LHmemDLh5aDTX6CbHL z2xTQm1U4txlS4aUH4Y8lBM3vLIpPNptvjafVM+s2ZBPqHl40cnEeKxs9r8ECBnY9F io31MjG/bZkCIt5+AXzgPRQvDlRAO8FsgyPApEDpo/2ET85G4DdXtKSkw08a4OlzIx s0Mj/Zrfo14tQ== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 49204CE0A6F; 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" , Yujie Liu , Andi Shyti Subject: [PATCH cmpxchg 1/3] xtensa: Emulate one-byte cmpxchg Date: Mon, 5 Aug 2024 12:21:17 -0700 Message-Id: <20240805192119.56816-1-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240805_122124_308986_DDD39A34 X-CRM114-Status: GOOD ( 11.70 ) X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org 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. ] [ Apply Geert Uytterhoeven 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..95e33a913962d 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(ptr, old, new); case 4: return __cmpxchg_u32(ptr, old, new); default: __cmpxchg_called_with_bad_pointer(); return old; -- 2.40.1 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc