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Sat, 04 May 2024 23:48:37 -0700 (PDT) Received: from google.com ([2401:fa00:8f:203:8263:3b89:bcee:2ed4]) by smtp.gmail.com with ESMTPSA id j3-20020a170903028300b001e7c05cf1a2sm5978407plr.112.2024.05.04.23.48.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 04 May 2024 23:48:36 -0700 (PDT) Date: Sun, 5 May 2024 15:48:32 +0900 From: Sergey Senozhatsky To: Andrew Morton , linux-kbuild@vger.kernel.org Cc: kernel test robot , Minchan Kim , llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, Linux Memory Management List , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Sergey Senozhatsky Subject: Re: [PATCH 08/14] zram: check that backends array has at least one backend Message-ID: <20240505064832.GC8623@google.com> References: <20240503091823.3616962-9-senozhatsky@chromium.org> <202405041440.UTBQZAaf-lkp@intel.com> <20240504071416.GH14947@google.com> <20240504161004.f5a0aab5e5aa1033d4696c20@linux-foundation.org> <20240505043957.GA8623@google.com> <20240505051305.GB8623@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240505051305.GB8623@google.com> X-Rspamd-Queue-Id: B260820002 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: r8fyxtbsifzoojpm8gacau1b17whos8q X-HE-Tag: 1714891718-686054 X-HE-Meta: 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 FNH7cPjq NdRudUuKfdUuW2/lVZKO8RdPtbRzt8lqVDr7PgF7+OTJlKfXrsR+G5ErK3NutKCka5O8a2KVRKWF0ZKlgGUtIRgGZQ4HypiLPJfk2sZnbNMYY7r4995JkF3Mg2qyZKszV8g9sX62m6Sk9D32IOPJdKlrhGf/k3HuldJXL97+l05hwSVQtEO+D0rjF7ajd9QFlast945SOZLdzLZxEl/sTgp+SMWGI1ltMvj12QTU7ByjNBTGi9/vVWui2OgWzUkioBYkIa/Wn0S9rA91IcDODFLMZ4YBd01OHthlncTHOowqdtquRACYWxHoCzl1gXHRdHubqnaHm9qIQya//nBibrYR5ys6BTj/fjDoVfhavmXzwY8jthXDig3t3YxEPh4GrnFLlJTnjAqWqn7k= X-Bogosity: Ham, tests=bogofilter, spamicity=0.267846, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On (24/05/05 14:13), Sergey Senozhatsky wrote: > On (24/05/05 13:39), Sergey Senozhatsky wrote: > [..] > > > I guess just pick one if none were selected. > > How do I pick one if none were selected? Does Kconfig support > something like that? This triggers Kconfig error: config ZRAM_EMPTY_BACKENDS_FIXUP bool depends on ZRAM && !ZRAM_BACKEND_LZO && !ZRAM_BACKEND_LZ4 && \ !ZRAM_BACKEND_LZ4HC && !ZRAM_BACKEND_ZSTD && \ !ZRAM_BACKEND_DEFLATE select ZRAM_BACKEND_LZO drivers/block/zram/Kconfig:17:error: recursive dependency detected! drivers/block/zram/Kconfig:17: symbol ZRAM_BACKEND_LZO is selected by ZRAM_EMPTY_BACKENDS_FIXUP drivers/block/zram/Kconfig:52: symbol ZRAM_EMPTY_BACKENDS_FIXUP depends on ZRAM_BACKEND_LZO I'm a little surprised by this - EMPTY_BACKENDS_FIXUP does not depend on ZRAM_BACKEND_LZO, it depends on NOT ZRAM_BACKEND_LZO. Let me Cc linux-kbuild. Kbuild folks, how do I workaround this?