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Mon, 23 Sep 2024 08:47:42 -0700 (PDT) Received: from google.com ([2401:fa00:8f:203:fd63:e1cf:ea96:b4b0]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-207946d1554sm134149685ad.144.2024.09.23.08.47.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Sep 2024 08:47:42 -0700 (PDT) Date: Tue, 24 Sep 2024 00:47:38 +0900 From: Sergey Senozhatsky To: Andrey Skvortsov , Venkat Rao Bagalkote Cc: Minchan Kim , Jens Axboe , Andrew Morton , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, stable@vger.kernel.org, Sergey Senozhatsky Subject: Re: [PATCH] zram: don't free statically defined names Message-ID: <20240923154738.GE38742@google.com> References: <20240923080211.820185-1-andrej.skvortzov@gmail.com> <20240923153449.GC38742@google.com> Precedence: bulk X-Mailing-List: stable@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: <20240923153449.GC38742@google.com> ** Re-sending properly, somehow I managed to badly mess up the headers the first time, sorry *** On (24/09/24 00:34), Sergey Senozhatsky wrote: > On (24/09/23 11:02), Andrey Skvortsov wrote: > > for (prio = ZRAM_SECONDARY_COMP; prio < ZRAM_MAX_COMPS; prio++) { > > - kfree(zram->comp_algs[prio]); > > + /* Do not free statically defined compression algorithms */ > > We probably don't really need this comment. > > > + if (zram->comp_algs[prio] != default_compressor) > > + kfree(zram->comp_algs[prio]); > > zram->comp_algs[prio] = NULL; > > } > > OK, so... I wonder how do you get a `default_compressor` on a > non-ZRAM_PRIMARY_COMP prio. May I ask what's your reproducer? > > I didn't expect `default_compressor` on ZRAM_SECONDARY_COMP > and below. As far as I can tell, we only do this: > > comp_algorithm_set(zram, ZRAM_PRIMARY_COMP, default_compressor); > > in zram_reset_device() and zram_add(). So, how does it end up in > ZRAM_SECONDARY_COMP... Ugh, I know what's happening. You don't have CONFIG_ZRAM_MULTI_COMP so that ZRAM_PRIMARY_COMP and ZRAM_SECONDARY_COMP are the same thing. Yeah, that all makes sense now, I haven't thought about it. Can you please send v2 (with the feedback resolved).