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Mon, 23 Sep 2024 18:46:37 -0700 (PDT) Received: from google.com ([2401:fa00:8f:203:fd63:e1cf:ea96:b4b0]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71afc846e0esm232357b3a.81.2024.09.23.18.46.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Sep 2024 18:46:36 -0700 (PDT) Date: Tue, 24 Sep 2024 10:46:32 +0900 From: Sergey Senozhatsky To: Christophe JAILLET Cc: Andrey Skvortsov , Venkat Rao Bagalkote , Minchan Kim , Sergey Senozhatsky , Jens Axboe , Andrew Morton , linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH v3] zram: don't free statically defined names Message-ID: <20240924014632.GI38742@google.com> References: <20240923164843.1117010-1-andrej.skvortzov@gmail.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: On (24/09/23 19:40), Christophe JAILLET wrote: [..] > > +++ b/drivers/block/zram/zram_drv.c > > @@ -2115,8 +2115,10 @@ static void zram_destroy_comps(struct zram *zram) > > zram->num_active_comps--; > > } > > - for (prio = ZRAM_SECONDARY_COMP; prio < ZRAM_MAX_COMPS; prio++) { > > - kfree(zram->comp_algs[prio]); > > + for (prio = ZRAM_PRIMARY_COMP; prio < ZRAM_MAX_COMPS; prio++) { > > + /* Do not free statically defined compression algorithms */ > > + if (zram->comp_algs[prio] != default_compressor) > > + kfree(zram->comp_algs[prio]); > > Hi, > > maybe kfree_const() to be more future proof and less verbose? I didn't know about kfree_const(). If we change ->comp_algs release to kfree_const(), then I'd probably prefer it to be a separate patch that changes both zram_destroy_comps() and comp_algorithm_set(). The current patch works for the way it is, given that it fixes a nasty problem.