From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=209.85.221.54 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794484974; b=lhRJQLOh4+2pJ2wveCUaTx5BdKXSld10FT5rq2ZiW8Tx9Cp8vDb7MDQK326aucdxUE/B iWToHyALmdY7ups44Yy0zbNZalYTh9D4Rp0Tk7aHeRH8XSGaI1XDz5ccGmUvdWD+0sGGg wwVQV4iU2Dn72AweZQqu06ytztHqTNE8S8b6mgVk7cEYiL2a2aX8vv0UsiT3c7MLfhJcM 9iFySzNBGa2xHKy+jmn1xZSkq+UDqo486xQR19mDH1vHDcBadYqhnUFkffSvPMb1qEiDQ veQRyudkdadHz3mu3i+04JspQzVFPYzq2HzSQ2xHJ7QWXLnSsPFvxkpt5c3Al2GE5aA== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794484974; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received:Received: Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References:X-Mailer: MIME-Version:Content-Type:Content-Transfer-Encoding; bh=f4QOZ/ziloNp1YzjgE4+Apo8LJ81vNJIp5Lxxwu3DGk=; b=OPTRCTkr05sD0X8J74jbz3p0rnYyKeTNcT1xhoIHhQJMLCwR9B2zMhs0SR4vWapTnU/E Gx9upWjW9dYP+1kNEjswoxgPezvZvdsS18C/HKU9w8ar7lt8D2FfEkYlXK26IDH0IGVvL eSyFC689z9RK2W2KlurVAHZlkDyHu0abbVpesNzKHhuiuKLEE0ux4srKLo9NR7up4BXWd I+63XQob9gN0oyXGzOByBUsWKwvyIzEcbz3HXlHVBQ1XZ3qTk4WWyQAfhJpuj48Kts2Qc udrFt/GK3fIQoIF88mTtyodzRKp7RkCKuBp91+7YuqSl5TEXGM5j/jyvFKQA//wi8iw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=qTz3u11O; arc=none smtp.remote-ip=209.85.221.54 Received: from mail-wr1-f54.google.com (mail-wr1-f54.google.com [209.85.221.54]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 15C04606A321 for ; Thu, 12 Nov 2026 12:02:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 15C04606A321 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=qTz3u11O Received: by mail-wr1-f54.google.com with SMTP id ffacd0b85a97d-48e09aa5264so2401832f8f.2 for ; Thu, 12 Nov 2026 04:02:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1794484972; x=1795089772; darn=lists.linux.dev; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:subject:cc:to:from:date:from:to:cc:subject :date:message-id:reply-to:content-type; bh=f4QOZ/ziloNp1YzjgE4+Apo8LJ81vNJIp5Lxxwu3DGk=; b=qTz3u11ODUad9ARAfkRj3ypssVNidu1gNYY1vlrlk9vRGtHbVAniLCHI8+DJukb+i9 VkPcpFU4p6Wea6KB9GP/FmS9B9zb+0cs8M8MbvDvAXIHdrYQbsPA7H+NgeWA8EaGJDwS JXwOE/1teqhNKzCNdLWTAJCFmq7ZfDPTCcqHW8gg55mVIflWNcDWYSctAaKS+TOQGyKs AA7ZglVT6y9fJkBB3odVrSmyFHTLETJFjoewrBBQzAxbkX/lr2/H641p32fsgJmdHSEt vPt9jx6vRXtswqwCqHQkACAZiJy/9pKQTjEuJ6qE+jkKFYhLnVvgtZe/6t6hrLDsCx3b 3X+w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1794484972; x=1795089772; h=content-transfer-encoding:content-type:mime-version:references :in-reply-to:message-id:subject:cc:to:from:date:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=f4QOZ/ziloNp1YzjgE4+Apo8LJ81vNJIp5Lxxwu3DGk=; b=WGufS/1lGsdmABjFFXma/kdoQtuwySpbNwBlOhVkcz8xIimg8KLaxmgpyYKrTjnR25 ISFmG0Uz9AmUNbaF/SUwLWHNY5LI41Tdhuw6xYz2vHTm6NbbKABE2gl/6xbcE4145tRX 7+cnAMUdnGxrTxBHGV8PXEpFvw87fJIp1W6GXNyDk21zKpEIF1VFZw8KssB+sCJAKKsZ kB026IWbd3f0OuR1wnbmmciWWDNS38dfP7yFGYh7ot5bt7dLowpPQ5vymTT6msd0ddsW 32TFIB0PjaZXhttv2x9uG7L/V07fU0WraBJ1jp+6Bw/0M6Zz+Vjq6vQXJY/pTMPbxDGT h77Q== X-Forwarded-Encrypted: i=1; AL+hErF7aiDt+o8KqeC6tNJK3DavuEjpPMMOXyJdCaI6zPQMD3o+yjHoewTrnXyHoyuKf1Pb3BVu@lists.linux.dev X-Gm-Message-State: APuU4Z8lLTzRM0O11tRCHih38h4NoQXyhr9yYlA8AhWz4CrY9fSV6zSr WqzcJBEeS3rXsd5zYchQKn/5eUn4x50ypMn9Xk+YfudEhuGAsCX1fOB5 X-Gm-Gg: AYBFou0T3OY3NdGuTG5JbuB8Op6HzVm3kVndFq6BDmf0Sqjoc+YHoc2PboUhE0xhO5e QMbpkIZ2jjeZ4u1c4zCVFQOG1c6NZN/irIRnSAWD+rsbcOT0LbDKqRGiY+VrzqcDvCdjI2CnNqx P6j46KXppwlHV+yS7Bgo0150O0mnUmWRU/vLt3rZGY2iPc82/j1ie6I5lYZ+lDvDDredcNMx7yj J/IA+RdBITgESa8ka6vt+UJ//E/EAw4PFZIYj386/cIu4JimhB9zTfpfz13hbcoCWnJ9/M5caoq EYcZO5n6hN3SPzrI/HoCbYhZLjSTYMbMzvfP9PoXkIWpRBw60+TUNiswzewsLCzNYBy1CTHYy/y X72x+nkb01DJ1FXvrXwoUVOoS5JLftSfE5E8phrjDX8P6hZBjyz4mcwinpoWDx2r+C6ENKWxG/r 3laesGjHd5GxOZTOOlyjWdV8cqoCArgaCB56XPDI7aGNuDH8auim7iX09PJOHO3XKxZZ5q5WQHH FQLjzcMVcxePz+2OW2uQS6tjX+wqtO6FB8VYlY6S+UM+U5rO7IXp5lQ7YE5vQ3GzqeH7beMWV2M Q7DwBDmDZ+N0n7a3XXiUDWXYmhlHXrJXHsVV+yJtbI6AD68de7FCu4qFBpk+RNJa+w== X-Received: by 2002:a05:6000:460b:b0:491:1e3f:a427 with SMTP id ffacd0b85a97d-499c898168fmr8711941f8f.42.1794484971757; Thu, 12 Nov 2026 04:02:51 -0800 (PST) Received: from pumpkin (82-69-66-36.dsl.in-addr.zen.co.uk. [82.69.66.36]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-498367ba82csm16541261f8f.50.2026.11.12.04.02.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Nov 2026 04:02:51 -0800 (PST) Date: Thu, 12 Nov 2026 12:02:48 +0000 From: David Laight To: Yunhui Cui Cc: pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, dennis@kernel.org, tj@kernel.org, cl@gentwo.org, oleg@redhat.com, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, eddyz87@gmail.com, memxor@gmail.com, martin.lau@linux.dev, song@kernel.org, yonghong.song@linux.dev, jolsa@kernel.org, emil@etsalapatis.com, ihor.solodrai@linux.dev, bjorn@kernel.org, pulehui@huawei.com, puranjay@kernel.org, broonie@kernel.org, dave@stgolabs.net, jszhang@kernel.org, tglx@kernel.org, conor.dooley@microchip.com, thuth@redhat.com, ajones@ventanamicro.com, ben.dooks@codethink.co.uk, rkrcmar@ventanamicro.com, samuel.holland@sifive.com, zong.li@sifive.com, debug@rivosinc.com, seanwascoding@gmail.com, andybnac@gmail.com, menglong8.dong@gmail.com, cyrilbur@tenstorrent.com, wangruikang@iscas.ac.cn, atishp@rivosinc.com, apatel@ventanamicro.com, arnd@arndb.de, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, qingfang.deng@siflower.com.cn, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, linux-arch@vger.kernel.org, llvm@lists.linux.dev Subject: Re: [PATCH v10 2/9] riscv: add infrastructure for preemptible this_cpu operations Message-ID: <20261112120248.5c8265e2@pumpkin> In-Reply-To: <20261112104149.38589-3-cuiyunhui@bytedance.com> References: <20261112104149.38589-1-cuiyunhui@bytedance.com> <20261112104149.38589-3-cuiyunhui@bytedance.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) X-Mailing-List: llvm@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 12 Nov 2026 18:41:42 +0800 Yunhui Cui wrote: > +/* > + * Mark a region where the per-CPU offset and address registers may need to > + * be rewritten by exception return after migration. The three registers > + * must remain distinct for the whole region. > + */ > +#define __PCPU_GPRS_BEGIN \ > + __DEFINE_ASM_GPR_NUMS \ > + __PCPU_GPRS_ASSERT_DISTINCT \ > + "li %[off], " __PCPU_GPRS_VALUE "\n" \ > + "sh %[off], %[gprs]\n" \ > + REG_L " %[off], %[pcpu_offset]\n" \ > + "add %[addr], %[pcp], %[off]\n" > + > +#define __PCPU_GPRS_END \ > + "sh zero, %[gprs]\n" Those are quite nasty with all the hidden variable names. It wouldn't do any harm to pass the names though. David