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Tue, 24 Jun 2025 17:03:13 +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 GNhlK1HaWmjcKAAAD6G6ig (envelope-from ); Tue, 24 Jun 2025 17:03:13 +0000 Message-ID: Date: Tue, 24 Jun 2025 19:03:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 4/4] mm, madvise: use standard madvise locking in madvise_set_anon_name() Content-Language: en-US To: Andrew Morton , "Liam R. Howlett" , Lorenzo Stoakes , David Hildenbrand , Jann Horn , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Colin Cross Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20250624-anon_name_cleanup-v2-0-600075462a11@suse.cz> <20250624-anon_name_cleanup-v2-4-600075462a11@suse.cz> 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: <20250624-anon_name_cleanup-v2-4-600075462a11@suse.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspam-User: X-Stat-Signature: azn5nhyghb1jxk6kuza1ii6bxqcphgcq X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 8BC6FC001B X-HE-Tag: 1750784596-95433 X-HE-Meta: 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 VYHIf26H /Wx3KMC4mlwhTSL6Xre+XdOsa8d5VD90v4gKaXsYKdsj9QeeTsWxKr7+AyO8+A8JMB5HXTni5RnxhT8gQllvBePFQRKTVpzrP5bQAQB4FnEB6bMkpj+piAb1VBgBYFs+gbu7EXg5ccgheGIocOntVmakJ8nzQRghHg0X94eCtd11KSDmzWwV64hBHG8XLXrxo4OmhJLp1AEjCQAL2aDrqjwlOk1ii4bA2I4kXmV7DbMdwGqsNsXL/kaICiFIEjh6omGN7YoEynCd4zmMYiYxcwku/eWR7/yDpkgIeoRiNwU4dp9JhIv6XthCjfK4ssR5YMTFtZdnGiSIW+9h1IrD96tjubxgMRt2nZwiynM3ykBtV5Is5mHp2ogQG/w== 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 6/24/25 15:03, Vlastimil Babka wrote: > Use madvise_lock()/madvise_unlock() in madvise_set_anon_name() in the > same way as in do_madvise(). This narrows the lock scope a bit and > reuses existing functionality. get_lock_mode() already picks the correct > MADVISE_MMAP_WRITE_LOCK mode for __MADV_SET_ANON_VMA_NAME so we can just > remove the explicit assignment. Additional paragraph here: There is a user visible change in that the prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME...) might now return -EINTR. > Signed-off-by: Vlastimil Babka > --- > mm/madvise.c | 13 +++++++++---- > 1 file changed, 9 insertions(+), 4 deletions(-) > > diff --git a/mm/madvise.c b/mm/madvise.c > index cae064479cdf908707c45b941bd03d43d095eab6..ee02ccd0315a146cdb3001cd189e03be9e48a2ea 100644 > --- a/mm/madvise.c > +++ b/mm/madvise.c > @@ -2082,10 +2082,10 @@ static int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, > { > unsigned long end; > unsigned long len; > + int error; > struct madvise_behavior madv_behavior = { > .mm = mm, > .behavior = __MADV_SET_ANON_VMA_NAME, > - .lock_mode = MADVISE_MMAP_WRITE_LOCK, > .anon_name = anon_name, > }; > > @@ -2106,7 +2106,14 @@ static int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, > > madv_behavior.range.start = start; > madv_behavior.range.end = end; > - return madvise_walk_vmas(&madv_behavior); > + > + error = madvise_lock(&madv_behavior); > + if (error) > + return error; > + error = madvise_walk_vmas(&madv_behavior); > + madvise_unlock(&madv_behavior); > + > + return error; > } > > int set_anon_vma_name(unsigned long addr, unsigned long size, > @@ -2136,9 +2143,7 @@ int set_anon_vma_name(unsigned long addr, unsigned long size, > return -ENOMEM; > } > > - mmap_write_lock(mm); > error = madvise_set_anon_name(mm, addr, size, anon_name); > - mmap_write_unlock(mm); > anon_vma_name_put(anon_name); > > return error; >