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Mon, 03 Aug 2026 22:48:50 -0700 (PDT) Received: from google.com ([2a00:79e0:2031:6:fcb5:533d:198b:8d48]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-38fedc650a0sm710924a91.14.2026.08.03.22.48.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Aug 2026 22:48:50 -0700 (PDT) Date: Tue, 4 Aug 2026 14:48:44 +0900 From: Sergey Senozhatsky To: Haoqin Huang Cc: Minchan Kim , Sergey Senozhatsky , Jens Axboe , Nick Terrell , David Sterba , Andrew Morton , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, Haoqin Huang , Rongwei Wang Subject: Re: [PATCH v5 3/4] zram: validate parameters in each backend's setup_params Message-ID: References: <20260730060133.80233-1-haoqinhuang7@gmail.com> <20260803141256.60599-1-haoqinhuang7@gmail.com> <20260803141256.60599-4-haoqinhuang7@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260803141256.60599-4-haoqinhuang7@gmail.com> On (26/08/03 22:12), Haoqin Huang wrote: [..] > static int setup_params_842(struct zcomp_params *params) > { > + if (params->dict_sz) { > + pr_err("842: dictionary is not supported\n"); > + return -EOPNOTSUPP; > + } > + if (params->level != ZCOMP_PARAM_NOT_SET) { > + pr_err("842: compression level is not supported\n"); > + return -EOPNOTSUPP; > + } > return 0; > } [..] > static int deflate_setup_params(struct zcomp_params *params) > { > + if (params->dict_sz) { > + pr_err("deflate: dictionary is not supported\n"); > + return -EOPNOTSUPP; > + } > + > if (params->level == ZCOMP_PARAM_NOT_SET) > params->level = Z_DEFAULT_COMPRESSION; > + else if (params->level < Z_DEFAULT_COMPRESSION || > + params->level > Z_BEST_COMPRESSION) { > + pr_err("deflate: invalid compression level %d\n", params->level); > + return -EINVAL; > + } This is purely optional, if you add per-backend pr_fmt() with backend name e.g. "zstd:","lz4:" and so on (in a separate patch) then you don't need to explicitly prefix every pr_err().