From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ed1-f45.google.com (mail-ed1-f45.google.com [209.85.208.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4C7B3B6BE3 for ; Fri, 31 Jul 2026 09:43:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.45 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785491019; cv=none; b=UFNTkl66jif/bjvSi/1Hpx0XMy4fU4e0OKFbY5f8gxw94tnOhBGUIOhEdwWBWrz3sNOqC+nvX9QZIXcoHy65Ys8eaUFguyemJ23AbwkSCKQKE7Pa8+7Mku/LweqqVyAsi8upZ5XSb1Hi/JutyASHuPmAV8K39rhyyMGSdmlhrKE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785491019; c=relaxed/simple; bh=/QdSdLjUr8GoKIicMzB4IspDt8INcXs5W8mDh6en7SY=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=HYiDls/N5zKytqILTV2ZXohyio4ODnVkuhE/PWjc/y0lp9544K0EaShKMMLJ/vSTpddHinDV2IBW9k+8ZiSnCBGYZyGUZoXv97zmpHPoC+flPFMbaslMLMZLHD4WeSepVW6BYq6FEQv05yb0bx6l+4nKp+rtwYTBUHU2+96C0dA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=OWSW2hUi; arc=none smtp.client-ip=209.85.208.45 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.b="OWSW2hUi" Received: by mail-ed1-f45.google.com with SMTP id 4fb4d7f45d1cf-69c1220bd51so1231553a12.3 for ; Fri, 31 Jul 2026 02:43:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1785491016; x=1786095816; darn=vger.kernel.org; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:sender:from:to:cc:subject:date:message-id:reply-to :content-type; bh=EEjpDgsNWoQnVSD8E6tp5/NrYVs6Sj6Mdfebm6L48UE=; b=OWSW2hUi3GW5HCGtWwBrlY4S4Jfdhhfx3fW/PT5IzMZla2KXF9yxZdtpJGHAlDfQLr k/oeV+rXuVBkq44qDR/gR6H/NyuGhM+aBkuoMZlAlPotQCsJ/M7QMgCUfRnDmu0rw4ql hTYOuq0HzPt0AhebQO0jDB5zF3z37nkkvS4EgOLt+jcMa1IKE2d4vX1+/ZxJOv8XvHWX Os8E6ENkLEMytz6eQ9jjU/prHt+f0M2WbBktMssan0n/PrWn/6umiW/dRiazk7iYOrzX nqvZj+7fhZS/JJm1qV4xhH/oDJ2447uG3lkxCId91MpcGLJjgBOYIQQy/+tzrJA0KudL b9NA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785491016; x=1786095816; h=content-transfer-encoding:content-type:in-reply-to:from :content-language:references:cc:to:subject:user-agent:mime-version :date:message-id:sender:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to:content-type; bh=EEjpDgsNWoQnVSD8E6tp5/NrYVs6Sj6Mdfebm6L48UE=; b=Skf4M5/otS1TKx2VrUMsLGda4kpxnbpKZriwzmmyG03T1rjCyrim1qcgczB5apOQaV eDDwOoS7NF3VXonhuZgUCeCKdgVcT3/Hm6rmigcMqbAi4KdRv/1tbRvuHM3wJ+KBlYpO az8x3jLaVeck3io2HtLDdaPGy+9W/SrhM0RhCcGDWYeYgW+Urjk5t+Ez5sLnhaJaw7Kx jhEiGuYIfxA9Z80ZEwzqh6SPLeec6pYcNkgkoBos5K+oIEJYUKRn2K5d5TOuDczcEzM4 cvC6sIJdl7rt71u0iYtey6P0OVLRUaWlYyMxYT1gy1bafQi2lv2aW1FYtzzSEaF49WHS qdfA== X-Forwarded-Encrypted: i=1; AHgh+RpR+5xUDqzm18g60p5T3FlqnL0YbmmO3CyCrsWRA9/D8R6acqdTw0OEMvdqAegIZC9MFC8NipK9iP0Mdk8=@vger.kernel.org X-Gm-Message-State: AOJu0YyOjqtH5qvMI0emGOKLpTsbUlB6ACAPEhonUH9ugMahWe6ilaRy MfaNLhOAZzhItq6VyqPQCqoTi4zD3pjfkLHT0wQKHQBwnQJxvSCYszKKmKUjyMoIxKg= X-Gm-Gg: AR+sD10bUIj7sJt5Zp+JDDNun06cGJ1tvu+NY4gb755wU/AH7uFCIcust75ZMxelUUi nbb90v4XFpYps0FrgRkGT7NhtmwoSyVpHxUJHusBYnbC+TGhBN6herAXPnQmLIke6tKKb0O1FH8 sLOoHMORLPXvWK6CEpA7Yd1KtS8zVDgk7+9V0TlackLTzvb9Bo7zMZHoOSOAo0Fz2jzi9Zyvlge vaZQD+tcDGcQrFwgzBCX9Aaw687kRwgS2KpnDsRRMVN4j7B465jixGI/EC9mN+DUcZADvzbjlly pdvLVRopXaAfVbtqcxbo0gciZ5Cmooz/149hLWSyWuHwUBXUpmVPEg0gH8YataoWesLceZlujMN waQ9wa3bdoMxhw4ka+lObMc1/CokzVuzOBNoQ+/e5nIttO8Y3bumkqBW7Q+NKruqKRDCvvU5NLy WWVo4+XP29xR7aMKQshOFrWhV978WDLi3rVhmmdi51/nIgrONktsEFzyfMQw076Oy563SoJCr6F F9KRWFc+U3ZGnwr/5b3cS2NBlUefXjD2cdjCZOcUMiNftKjv19ib7Ejf6pD/CldPfupyasDjBfu IC4T2A== X-Received: by 2002:a17:907:7ba3:b0:c16:1031:e719 with SMTP id a640c23a62f3a-c1fd200f156mr73940866b.11.1785491015661; Fri, 31 Jul 2026 02:43:35 -0700 (PDT) Received: from ?IPV6:2001:8a0:e962:d100:1418:46b6:4675:1031? ([2001:8a0:e962:d100:1418:46b6:4675:1031]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-c1fd4532e1esm81618366b.50.2026.07.31.02.43.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 31 Jul 2026 02:43:35 -0700 (PDT) Sender: Julian Braha Message-ID: Date: Fri, 31 Jul 2026 10:43:34 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] Documentation: warn against using int, hex, string options as expressions in Kconfig To: Nathan Chancellor Cc: nsc@kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, jani.nikula@linux.intel.com, arnd@arndb.de, stefan.hengelein@fau.de, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, nico@fluxnic.net, officialnaumansabir@gmail.com, rdunlap@infradead.org, vegard.nossum@oracle.com, kees@kernel.org, tj@kernel.org References: <20260730140108.683967-1-julianbraha@gmail.com> <178545753473.3004192.2499981065379649802.b4-review@b4> Content-Language: en-US From: Julian Braha In-Reply-To: <178545753473.3004192.2499981065379649802.b4-review@b4> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/31/26 01:25, Nathan Chancellor wrote: > Drop this quoting of y for clarity? Sure, I'll send a v2. >> This 'if FOO' will always be false, regardless of FOO's value (even when >> FOO=1). The same goes for strings and hex. > Hmmm, it might be kind of nice to either: > > 1. Warn about this in Kconfig directly (if possible) > 2. Support this usage in Kconfig how one would intuitively expect from > either C or Python where symbols with values of 0, 0x0, and '' would > be treated as false and every other value set as true. Agreed, an interpreter change for this is on my roadmap. Though I was also considering to make this error out. Would be good to get some more feedback from others on which approach is preferred (Jani, Arnd?) > That said, until either of those potentially happen, this patch seems > fine. Thanks for your review! - Julian Braha