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b=izGGLCutqqcBp82UmrmqyGceR/3RWlWXrH77qMbUb648eQTOwohHXwOdzcGTUbe4h f1nzujvepQF/aOjf7A5GS1ZDh4QnxMEqEF7kEhAbI3KuATaFpvQFP/j92KH+dm/Hrc krsg6oM7HO6oPRp00JL6nIdbbMy3a73oQTF5rSvQcWyHI+GsXORtommKmS/83NuP5H 1BdO+ixYMri3EfxNOTzAW/eePaEd9IOc/KIy5obQ074gUYeifemx3PolNWY+buLUnE ljL/xPUbQHj3yJZo0I1r2qYa7yO+oJQK7Zx95huq8PFs5eo2kI6lzEJtIA8MnHgk9C QFXUlJIplqKJA== Message-ID: <7a318c3c-7ccb-4f95-a416-19d09f42c97f@kernel.org> Date: Fri, 10 Apr 2026 09:57:27 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/2] selftests/mm: verify droppable mappings cannot be locked To: Anthony Yznaga , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, jannh@google.com, pfalcato@suse.de, Jason@zx2c4.com, shuah@kernel.org References: <20260409234915.11723-1-anthony.yznaga@oracle.com> <20260409234915.11723-3-anthony.yznaga@oracle.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: g3ezs54coy73kcdukgrf6h6u6sdmo3z4 X-Rspamd-Queue-Id: A1B74180003 X-Rspamd-Server: rspam09 X-HE-Tag: 1775807854-725965 X-HE-Meta: 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 c7zNmIc/ mDaW/EnyX0RfFSsZ1ur84SOCxyOr+tW3uaHmVhVsQTw6oIJPDIF+dgyQXu5mUjk84dO+7YLu31ruQv5uNtnbE42evmhNN0bmZ+T/IWPouzVe7MIBRT38ef0rKnZy4IjohahXyRfBxjec5lkHGSt/OiGI1pyMQXgX86TOdo41KQT4K3YAl7zWj3PRc7eKvSRYxzTjCla8+tJNNrai36enUMonyNVSV/0mWzVusH4oO60NnKTsZz2j3WEZ6ipBp+utt2Pee/lKVpj67n5tnHKcUeOgnye/2GXrU3Aj3Y2eCpwHhu/2Qy16ttj3/hQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/10/26 01:49, Anthony Yznaga wrote: > For configs that support MAP_DROPPABLE verify that a mapping created > with MAP_DROPPABLE cannot be locked via mlock(), and that it will not > be locked if it's created after mlockall(MCL_FUTURE). > > Signed-off-by: Anthony Yznaga > --- [...] > + > +#ifdef MAP_DROPPABLE > +/* > + * Droppable memory should not be lockable. > + */ Single-line comment. > +static void test_mlock_droppable(void) > +{ > + char *map; > + unsigned long page_size = getpagesize(); We could store that in a static global and query it once during main(). Feel free to keep it as is. > + > + /* > + * Ensure MCL_FUTURE is not set. > + */ Dito. > + if (munlockall()) { > + ksft_test_result_fail("munlockall() %s\n", strerror(errno)); > + return; > + } > + > + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, > + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); > + if (map == MAP_FAILED) { > + if (errno == EOPNOTSUPP) > + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); > + else > + ksft_test_result_fail("mmap error: %s\n", strerror(errno)); > + return; > + } > + > + if (mlock2_(map, 2 * page_size, 0)) Weird, is "mlock2_" actually correct? (not "mlock2") ? > + ksft_test_result_fail("mlock2(0): %s\n", strerror(errno)); > + else > + ksft_test_result(!unlock_lock_check(map, false), > + "%s: droppable memory not locked\n", __func__); > + > + munmap(map, 2 * page_size); > +} > + > +static void test_mlockall_future_droppable(void) > +{ > + char *map; > + unsigned long page_size = getpagesize(); > + > + if (mlockall(MCL_CURRENT | MCL_FUTURE)) { > + ksft_test_result_fail("mlockall(MCL_CURRENT | MCL_FUTURE): %s\n", strerror(errno)); > + return; > + } > + > + map = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, > + MAP_ANONYMOUS | MAP_DROPPABLE, -1, 0); > + > + if (map == MAP_FAILED) { > + if (errno == EOPNOTSUPP) > + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); > + else > + ksft_test_result_fail("mmap error: %s\n", strerror(errno)); > + munlockall(); > + return; > + } > + > + ksft_test_result(!unlock_lock_check(map, false), "%s: droppable memory not locked\n", > + __func__); > + > + munlockall(); > munmap(map, 2 * page_size); > } > +#else > +static void test_mlock_droppable(void) > +{ > + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); > +} > + > +static void test_mlockall_future_droppable(void) > +{ > + ksft_test_result_skip("%s: MAP_DROPPABLE not supported\n", __func__); > +} > +#endif /* MAP_DROPPABLE */ > Why not a above a #ifndef MAP_DROPPABLE #define MAP_DROPPABLE 0x08 #endif instead? > static void test_vma_management(bool call_mlock) > { > @@ -442,7 +522,7 @@ int main(int argc, char **argv) > > munmap(map, size); > > - ksft_set_plan(13); > + ksft_set_plan(15); > > test_mlock_lock(); > test_mlock_onfault(); > @@ -451,6 +531,8 @@ int main(int argc, char **argv) > test_lock_onfault_of_present(); > test_vma_management(true); > test_mlockall(); > + test_mlock_droppable(); > + test_mlockall_future_droppable(); > > ksft_finished(); > } Feel free to add Acked-by: David Hildenbrand (Arm) -- Cheers, David