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Tue, 30 Mar 2021 05:22:47 -0400 (EDT) Date: Tue, 30 Mar 2021 11:22:45 +0200 From: Greg KH To: sj38.park@gmail.com Cc: akpm@linux-foundation.org, SeongJae Park , Jonathan.Cameron@huawei.com, acme@kernel.org, alexander.shishkin@linux.intel.com, amit@kernel.org, benh@kernel.crashing.org, brendanhiggins@google.com, corbet@lwn.net, david@redhat.com, dwmw@amazon.com, elver@google.com, fan.du@intel.com, foersleo@amazon.de, gthelen@google.com, guoju.fgj@alibaba-inc.com, mgorman@suse.de, minchan@kernel.org, mingo@redhat.com, namhyung@kernel.org, peterz@infradead.org, riel@surriel.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, shakeelb@google.com, shuah@kernel.org, snu@amazon.de, vbabka@suse.cz, vdavydov.dev@gmail.com, zgf574564920@gmail.com, linux-damon@amazon.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v26 07/13] mm/damon: Implement a debugfs-based user space interface Message-ID: References: <20210330090537.12143-1-sj38.park@gmail.com> <20210330090537.12143-8-sj38.park@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210330090537.12143-8-sj38.park@gmail.com> X-Rspamd-Queue-Id: 381B880192E4 X-Stat-Signature: bnjrunicf5aqizoci85o6awqfwq1hg8s X-Rspamd-Server: rspam02 Received-SPF: none (kroah.com>: No applicable sender policy available) receiver=imf27; identity=mailfrom; envelope-from=""; helo=wnew3-smtp.messagingengine.com; client-ip=64.147.123.17 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617096169-311971 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, Mar 30, 2021 at 09:05:31AM +0000, sj38.park@gmail.com wrote: > +static int __init __damon_dbgfs_init(void) > +{ > + struct dentry *dbgfs_root; > + const char * const file_names[] = {"monitor_on"}; > + const struct file_operations *fops[] = {&monitor_on_fops}; > + int i; > + > + dbgfs_root = debugfs_create_dir("damon", NULL); > + > + for (i = 0; i < ARRAY_SIZE(file_names); i++) > + debugfs_create_file(file_names[i], 0600, dbgfs_root, NULL, > + fops[i]); > + dbgfs_fill_ctx_dir(dbgfs_root, dbgfs_ctxs[0]); > + > + dbgfs_dirs = kmalloc_array(1, sizeof(dbgfs_root), GFP_KERNEL); No error checking for memory allocation failures? > + dbgfs_dirs[0] = dbgfs_root; > + > + return 0; > +} > + > +/* > + * Functions for the initialization > + */ > + > +static int __init damon_dbgfs_init(void) > +{ > + int rc; > + > + dbgfs_ctxs = kmalloc(sizeof(*dbgfs_ctxs), GFP_KERNEL); No error checking? > + dbgfs_ctxs[0] = dbgfs_new_ctx(); > + if (!dbgfs_ctxs[0]) > + return -ENOMEM; > + dbgfs_nr_ctxs = 1; > + > + rc = __damon_dbgfs_init(); > + if (rc) > + pr_err("%s: dbgfs init failed\n", __func__); Shouldn't the error be printed out in the function that failed, not in this one? thanks, greg k-h