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[195.23.151.163]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47aa0a558easm8234031f8f.27.2026.07.04.06.23.48 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 04 Jul 2026 06:23:49 -0700 (PDT) Sender: Julian Braha Message-ID: <955bf67f-309d-45d4-ac0d-2f53577aa18e@gmail.com> Date: Sat, 4 Jul 2026 14:23:48 +0100 Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] kconfig: Support conditional deps using "depends on X if Y" To: Graham Roff , Nathan Chancellor , Nicolas Schier , Jonathan Corbet Cc: linux-kbuild@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Nicolas Pitre , Arnd Bergmann , jani.nikula@linux.intel.com, Masahiro Yamada References: <20251215-kconfig_conditional_deps-v3-1-59519af0a5df@qti.qualcomm.com> Content-Language: en-US From: Julian Braha In-Reply-To: <20251215-kconfig_conditional_deps-v3-1-59519af0a5df@qti.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Hi all, On 12/15/25 23:06, Graham Roff wrote: > Previously such optional dependencies had to be expressed as > the counterintuitive "depends on X || !X", now this can be > represented as "depends on X if X". I have always found both of these: 'depends on X || !X' and: 'depends on X if X' to be unintuitive and confusing to read. Yes, I understand from the docs that the purpose is to disallow FOO=Y with BAR=M, like in this example from the official kconfig docs: ``` config FOO tristate "Support for foo hardware" depends on BAR if BAR ``` However, in my testing, neither of these constructs are necessary to achieve that. A very standard 'depends on BAR' also disallows FOO=Y with BAR=M. As I'm working on my SMT solver for Kconfig, I need help understanding what else I'm missing about these two constructs. Unless it's just more readable to you all than 'depends on X'? - Julian Braha