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 CC836C43458 for ; Thu, 2 Jul 2026 11:25:14 +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:Message-ID:Date:References :In-Reply-To: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=u4NsQFPjviF0PgKKPiCLyQrILMfvS5WZ4XI4w4Uch5c=; b=e4wpXxkkL7ltVw nzqwkN2yh/1f1V4MQ98bvxNH/Npkno6F6HRgL3jcnoWWd2mLuMA2atPvQJtSSdBvXBVkjAf7HVs7i S1EYNOrn8kHrbofq3VQtz/IQwsldLrbv4tTN2gKil+8IrGRpxVnnc2HeX6mxwYanPfZWmoHuZvh2m zGa9MqksIQXRxCBXY0nRhBbyPKuXCjjAUH3hmnMm025DqYm3b9DTu75DzY2RVHZ3Pk12gSKuqIPli lc5u3zzdWxmdLoioYgMh5hnJps0tKhirnOaaXrA5VFNvKsP6Rzd2Z9B/16W6Gekv2xIga5KiYnSOH 6/EtNEaU5D6BkOnl4N/Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfFXT-00000004JUV-2y8o; Thu, 02 Jul 2026 11:25:03 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wfFXS-00000004JUO-18uq for linux-riscv@lists.infradead.org; Thu, 02 Jul 2026 11:25:02 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 40AD160103; Thu, 2 Jul 2026 11:25:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2817C1F00A3F; Thu, 2 Jul 2026 11:25:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782991501; bh=mOM3rzsLQ5zcU0KB7ppqvlisg4HQiYPTf14y3PbqPhs=; h=From:To:Cc:Subject:In-Reply-To:References:Date; b=kLTmUhIzP0y8iCpVDm6+5t9nX8pnl/FL2IHkdX+LfPQlaEB6wVtL1kzoiWM3qgtdM 9lTWMsYU7FF6L2fLFenc6N5j8Ef5Fsck26DORNh2e1uC+hhJjt3XhPbzYodE5No+/4 tWeWtodTFyens21QxAEsxxmbVM/H/aptMqXN2OB3YO2ifHuNtRpMc59RFcP/OFJdrl p/pPBwhqDVsZFrWWR0Y/4+EfsV6EJ/+t4oycLzrV5+G6c5l4TaSPPG0X2wti9LPib7 U22B6IjMFDRlMrSIOQnTd3sE3VScotvakJyHz80nD/AmM45TrVc/NRY1ZD3+rFexs+ OeLrJpr3ynMYA== From: Thomas Gleixner To: Michal =?utf-8?Q?Such=C3=A1nek?= , Peter Zijlstra Cc: Jonathan Corbet , Shuah Khan , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , "Christophe Leroy (CS GROUP)" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Andy Lutomirski , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andrew Donnellan , Mark Rutland , Michal =?utf-8?Q?Such=C3=A1nek?= , Arnd Bergmann , Jiaxun Yang , Ryan Roberts , Greg Kroah-Hartman , Mukesh Kumar Chaurasiya , Shrikanth Hegde , Zong Li , Nam Cao , Deepak Gupta , Lukas Gerlach , Rui Qi , Kees Cook , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org Subject: Re: [RFC] entry: Untangle the return value of syscall_enter_from_user_mode from syscall NR In-Reply-To: References: Date: Thu, 02 Jul 2026 13:24:57 +0200 Message-ID: <878q7tprau.ffs@fw13> MIME-Version: 1.0 X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gV2VkLCBKdWwgMDEgMjAyNiBhdCAxOTo0MiwgTWljaGFsIFN1Y2jDoW5layB3cm90ZToKPiBU aGUgcmV0dXJuIHZhbHVlIG9mIHN5c2NhbGxfZW50ZXJfZnJvbV91c2VyX21vZGUgaXMgdXNlZCBi b3RoIGZvciB0aGUKPiBhZGp1c3RlZCBzeXNjYWxsIG51bWJlciBhbmQgdGhlIGluZGljYXRvciB0 aGF0IGEgc3lzY2FsbCBzaG91bGQgYmUKPiBza2lwcGVkLgo+Cj4gQXMgc2VjY29tcCBjYW4gYmUg aW52b2tlZCBvbiBhbnkgc3lzY2FsbCwgaW5jbHVkaW5nIGludmFsaWQgb25lcyB0aGlzCj4gc29t ZXdoYXQgdW5kZXJtaW5lcyBzZWNjb21wLgo+Cj4gV2hpbGUgdGhlIHNlY2NvbXAgdmFyaWFudHMg dGhhdCB0ZXJtaW5hdGUgdGhlIHByb2Nlc3MgZG8gbm90IG5lZWQgdG8KPiBjYXJlIGFib3V0IHRo aXMgZm9yIHRoZSBmaWx0ZXIgdGhhdCBzZXRzIHRoZSBzeXNjYWxsIHJldHVybiB2YWx1ZSB0aGlz Cj4gZGlzY3RpbmN0aW9uIGlzIHJlcXVpcmVkLgoKWW91IGNvbXBsZXRlbHkgZmFpbCB0byBleHBs YWluIHdoeSBhbmQgd2hhdCBhY3R1YWwgcHJvYmxlbSB5b3UgYXJlCnRyeWluZyB0byBzb2x2ZS4g QXQgbGVhc3QgSSBjYW4ndCBmaWd1cmUgaXQgb3V0IGZyb20gdGhlIGFib3ZlIHdvcmQKc2FsYWQu Cgo+IFBhc3MgdGhlIHN5c2NhbGwgbnVtYmVyIGFzIGEgcG9pbnRlciB0byB0aGUgaW5saW5lIGVu dHJ5IGZ1bmN0aW9ucywgYW5kCj4gdXNlIHRoZSByZXR1cm4gdmFsdWUgZXhjbHVzaXZlbHkgZm9y IHRoZSBpbmRpY2F0aW9uIHRoYXQgdGhlIHN5c2NhbGwgaXMKPiBhbHJlYWR5IGhhbmRsZWQuCj4K PiBUaGlzIHNob3VsZCBhdm9pZCB0aGUgbmVlZCBmb3IgdGhlIHMzOTAgUElGX1NZU0NBTExfUkVU X1NFVCB3aGljaCBpcyB0aGUKPiB3b3JrYXJvdW5kIGZvciBleGFjdGx5IHRoaXMgZGVmaWNpZW5j eS4KPgo+IElmIHRoaXMgaXMgZGVzaXJhYmxlIHRoZSBwYXRjaCBjb3VsZCBiZSBzcGxpdCBpbnRv IHNvbWUgc2VyaWVzIHRoYXQKPiBhZGp1c3RzIHRoZSBjb2RlIGZsb3cgd2hlcmUgbmVlZGVkIHNv IHRoYXQgdGhlIGZpbmFsIGNoYW5nZSBpcyBtb3N0bHkKPiBtZWNoYW5pY2FsLgoKVGhhdCdzIG5v dCBhIG1hdHRlciBvZiBkZXNpcmUuIFRoYXQncyBtYW5kYXRvcnkuCgo+IC0JaW5zdHJ1bWVudGF0 aW9uX2JlZ2luKCk7Cj4gLQlpZiAoIWludm9rZV9zeXNjYWxsKHJlZ3MsIG5yKSAmJiBuciAhPSAt MSkKPiAtCSAJcmVzdWx0X3JlZyhyZWdzKSA9IF9fc3lzX25pX3N5c2NhbGwocmVncyk7Cj4gLQlp bnN0cnVtZW50YXRpb25fZW5kKCk7Cj4gKwkvKiBTa2lwIHN5c2NhbGwgd2hlbiAtMSBpcyByZXR1 cm5lZCAqLwo+ICsJaWYgKCFzeXNjYWxsX2VudGVyX2Zyb21fdXNlcl9tb2RlKHJlZ3MsICZucikp IHsKClNlcmlvdXNseT8KCklmIHdlIGdvIGFuZCBzZXBhcmF0ZSB0aGUgc3lzY2FsbCBudW1iZXIg ZnJvbSB0aGUgcmV0dXJuIHZhbHVlLCB0aGVuIHRoZQpyZXR1cm4gdmFsdWUgMCBtZWFucyBzdWNj ZXNzIGFuZCBhbnl0aGluZyBlbHNlIGZhaWwuIFdoaWNoIGluIG90aGVyCndvcmRzIGlzIGEgYm9v bGVhbi4gU28gaW5zdGVhZCBvZiB0YXN0ZWxlc3NseSBhZGRpbmcgYSBjb21wbGV0ZWx5Cm5vbnNl bnNpY2FsIGNvbW1lbnQgYWJvdXQgLTEgaGVyZSwgc3lzY2FsbF9lbnRlcl9mcm9tX3VzZXJfbW9k ZSgpIHdhbnRzCnRvIGhhdmUgdGhlIHJldHVybiB2YWx1ZSB0eXBlIGJvb2wgd2l0aCBhIHByb3Bl ciBib29sZWFuIGxvZ2ljOiB0cnVlID0Kc3VjY2VzcywgZmFsc2UgPSBhYm9ydC4KCj4gQEAgLTE2 OCw4ICsxNjgsNyBAQCBfX3Zpc2libGUgbm9pbnN0ciB2b2lkIGRvX2ludDgwX2VtdWxhdGlvbihz dHJ1Y3QgcHRfcmVncyAqcmVncykKPiAgCW5yID0gc3lzY2FsbF8zMl9lbnRlcihyZWdzKTsKPiAg Cj4gIAlsb2NhbF9pcnFfZW5hYmxlKCk7Cj4gLQluciA9IHN5c2NhbGxfZW50ZXJfZnJvbV91c2Vy X21vZGVfd29yayhyZWdzLCBucik7Cj4gLQlkb19zeXNjYWxsXzMyX2lycXNfb24ocmVncywgbnIp Owo+ICsJc3lzY2FsbF9lbnRlcl9mcm9tX3VzZXJfbW9kZV93b3JrKHJlZ3MsICZucik7CgpIb3cg ZXhhY3RseSBpcyB0aGlzIGV2ZXIgZ29pbmcgdG8gaW52b2tlIGEgdmFsaWQgc3lzY2FsbD8KCj4g KwlpZiAoIXN5c2NhbGxfZW50ZXJfZnJvbV91c2VyX21vZGVfd29yayhyZWdzLCAmbnIpKSB7Cj4g KwkJbnIgJj0gR0VOTUFTSygzMSwgMCk7Cj4gKwkJZG9fc3lzY2FsbF8zMl9pcnFzX29uKHJlZ3Ms IG5yKTsKCiAgZG9fc3lzY2FsbF8zMl9pcnFzX29uKHJlZ3MsIChpbnQpbnIpOwoKd291bGQgYmUg dG9vIHNpbXBsZSwgcmlnaHQ/CgpUaGFua3MsCgogICAgICAgIHRnbHgKCl9fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlz dApsaW51eC1yaXNjdkBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQu b3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtcmlzY3YK