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Mon, 25 Aug 2025 17:31:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id pssYMP2drGhjbAAAD6G6ig (envelope-from ); Mon, 25 Aug 2025 17:31:41 +0000 Message-ID: <7cfb3108-342b-41b7-b4fe-b01a574dbdf0@suse.cz> Date: Mon, 25 Aug 2025 19:31:41 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/2] mm/slub: Replace sort_r() with sort() for debugfs stack trace sorting Content-Language: en-US To: Kuan-Wei Chiu , akpm@linux-foundation.org Cc: cl@gentwo.org, rientjes@google.com, roman.gushchin@linux.dev, harry.yoo@oracle.com, glittao@gmail.com, jserv@ccns.ncku.edu.tw, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20250825013419.240278-1-visitorckw@gmail.com> <20250825013419.240278-3-visitorckw@gmail.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20250825013419.240278-3-visitorckw@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Stat-Signature: fd4pijd37c7kmqo9x6tajda4bhry5jur X-Rspam-User: X-Rspamd-Queue-Id: 63597100011 X-Rspamd-Server: rspam05 X-HE-Tag: 1756143103-545078 X-HE-Meta: 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 ME0FZ8Ir NThbwzVQK4JfZNIUxhRBP51Lbn8mFGS2/RQJsSXSF357wwieUAO2LVfHM5LpkvjpEVf8UG8GMhcopiWDyfnXYkEHHyURqVgwRcD+FmnchLX0ZeREJwGH21iilvyA84sqMz6/KZcjOp7j2S6QE3yJoJjWxEvTbzS2u/gft3jY1+Xe5BQU1qrIIvDKqtEXcohDWoDDzdLF9zXpUtraAh8+mEkeMf0uyamRZt7056baqQvAZdMPlw9Ezr/lPacEGO/Rh0ZiBOcwMCUazo4iIy59iFZuRgyPNEqOFcQgVZsQunEjKntqhwKL3uR2rDItNdPS0UUDq+lqY2E3FHJqCyRJclNIbRRYzKvF3GWj/9wNbqYxijag= 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: List-Subscribe: List-Unsubscribe: On 8/25/25 03:34, Kuan-Wei Chiu wrote: > The comparison function used to sort stack trace locations in debugfs > never relied on the third argument. Therefore, sort_r() is unnecessary. > Switch to sort() with a two-argument comparison function to keep the > code simple and aligned with the intended usage. > > Signed-off-by: Kuan-Wei Chiu LGTM. > --- > mm/slub.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/mm/slub.c b/mm/slub.c > index c91b3744adbc..67b68f132f84 100644 > --- a/mm/slub.c > +++ b/mm/slub.c > @@ -7711,7 +7711,7 @@ static void *slab_debugfs_next(struct seq_file *seq, void *v, loff_t *ppos) > return NULL; > } > > -static int cmp_loc_by_count(const void *a, const void *b, const void *data) > +static int cmp_loc_by_count(const void *a, const void *b) > { > struct location *loc1 = (struct location *)a; > struct location *loc2 = (struct location *)b; > @@ -7782,8 +7782,8 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep) > } > > /* Sort locations by count */ > - sort_r(t->loc, t->count, sizeof(struct location), > - cmp_loc_by_count, NULL, NULL); > + sort(t->loc, t->count, sizeof(struct location), > + cmp_loc_by_count, NULL); > > bitmap_free(obj_map); > return 0;