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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Miaohe Lin , Naoya Horiguchi , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260722091219.61504-1-usama.anjum@arm.com> <20260722091219.61504-3-usama.anjum@arm.com> From: Sarthak Sharma Content-Language: en-US In-Reply-To: <20260722091219.61504-3-usama.anjum@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA5PR01CA0153.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:1ac::14) To DU0PR08MB9203.eurprd08.prod.outlook.com (2603:10a6:10:417::12) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DU0PR08MB9203:EE_|AS8PR08MB8300:EE_|AM3PEPF0000A798:EE_|AS8PR08MB7942:EE_ X-MS-Office365-Filtering-Correlation-Id: bb568b14-fd33-4681-8380-08dee8872c02 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|23010399003|366016|1800799024|7416014|376014|921020|6133799003|56012099006|4143699003|11063799006|10067099003|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: M0c/jM5fXBoZJg4pW2IhWvsJQJ2kCtX/iEFOkd1IsQZP8Whxkg68SsjyOKY9AomeadH/NBin7No03+gDjUkDchtQEPEuPp2FQ5+LJ+PbM9yz2ecHGFEo826+p+TPJgIZD8FMnW9NjB3Zc1XxCO3ADjEuzL5oGDrufkTWJiFv9o3Tf/s2bf4ntAjiZuHXCKvhdtz72VDvk4WMzw7FGgxA9hdIxfWwU9pnKIBsTHcuslo2PVq8OevDRsjFOPcm1/UpUdi7SH5mzqz/z65/UKF5lDHDdyz4LgmPDb/hmDpqXl0OMT4qPKRhTZmj9Fp3Jm+z/Gm2blIZSOZo4J13QgacHTyo9LtOED3OziTH34ZV6s006ZI9V8nI/jVGWm9WityJYTrsQdtbe5PldWRmpAdgMCft3th/n/u7z3rmeOw1MkL9qATCVlJVpYX7xAXfK15P X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Jul 2026 06:53:58.8899 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bb568b14-fd33-4681-8380-08dee8872c02 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM3PEPF0000A798.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB7942 On 7/22/26 2:41 PM, Muhammad Usama Anjum wrote: > The hole_punch case verifies that guard regions survive MADV_REMOVE and > that the backing range is punched out. MADV_REMOVE delegates the hole > punch to the backing filesystem, which may reject the operation with > EOPNOTSUPP. > > That result means the test cannot establish the state whose guard > semantics it intends to validate. Treating the missing filesystem > capability as a guard-region failure creates a false regression. > > Unmap the range and skip only when MADV_REMOVE fails with EOPNOTSUPP. > Preserve the assertion for all other errors so failures on supported > configurations remain visible. > > Signed-off-by: Muhammad Usama Anjum I tested this patch on a QEMU by mounting ramfs over /tmp and then running guard-regions from /tmp. Before the patch: # RUN guard_regions.file.hole_punch ... # guard-regions.c:1947:hole_punch:Expected madvise(&ptr[3 * page_size], 4 * page_size, MADV_REMOVE) (-1) == 0 (0) # hole_punch: Test terminated by assertion # FAIL guard_regions.file.hole_punch not ok 84 guard_regions.file.hole_punch After the patch: # RUN guard_regions.file.hole_punch ... # SKIP MADV_REMOVE not supported by filesystem # OK guard_regions.file.hole_punch ok 84 guard_regions.file.hole_punch # SKIP MADV_REMOVE not supported by filesystem Tested-by: Sarthak Sharma > --- > tools/testing/selftests/mm/guard-regions.c | 10 +++++++--- > 1 file changed, 7 insertions(+), 3 deletions(-) > > diff --git a/tools/testing/selftests/mm/guard-regions.c b/tools/testing/selftests/mm/guard-regions.c > index b21df3040b1c7..5c8ec3ca75d7d 100644 > --- a/tools/testing/selftests/mm/guard-regions.c > +++ b/tools/testing/selftests/mm/guard-regions.c > @@ -1912,7 +1912,7 @@ TEST_F(guard_regions, hole_punch) > { > const unsigned long page_size = self->page_size; > char *ptr; > - int i; > + int i, ret; > > if (variant->backing == ANON_BACKED) > SKIP(return, "Truncation test specific to file-backed"); > @@ -1944,8 +1944,12 @@ TEST_F(guard_regions, hole_punch) > } > > /* Now hole punch the guarded region. */ > - ASSERT_EQ(madvise(&ptr[3 * page_size], 4 * page_size, > - MADV_REMOVE), 0); > + ret = madvise(&ptr[3 * page_size], 4 * page_size, MADV_REMOVE); > + if (ret == -1 && errno == EOPNOTSUPP) { > + ASSERT_EQ(munmap(ptr, 10 * page_size), 0); > + SKIP(return, "MADV_REMOVE not supported by filesystem"); > + } > + ASSERT_EQ(ret, 0); > > /* Ensure guard regions remain. */ > for (i = 0; i < 10; i++) {