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Tue, 14 Apr 2026 08:22:59 +0000 (GMT) From: Sayali Patil To: Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: David Hildenbrand , Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org, Miaohe Lin , Venkat Rao Bagalkote , Sayali Patil Subject: [PATCH v5 10/14] selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap Date: Tue, 14 Apr 2026 13:52:04 +0530 Message-ID: X-Mailer: git-send-email 2.52.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: bPe9bIAhS9SAlYQHEgyhU1p4k79fCvkr X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE0MDA3NyBTYWx0ZWRfX+qNJGZcil+9a /XxnS0SMY2MuN9+v5DB7CW4/tDvLGRvUXUbntkasH5nsBwInoNscmpLAg/brPUSuieqYFba9TIt ObXs65NvS6SQoiG2s3PBxCfWwgflPed/FTTQvYfwI+liHWYWPpxlyrIcHhzUdHRV/HvPr+4SgIg IBtaGBab83QpXCSiYWNHR9B8Brdx0kWNGoJo45QOulB02CAd9Nl+q+9EUvC5845og3almBhMsNI pmNsEdtKyMb9geVQ04hTN4rG3lejOCbVWwzLtR43jMUIXTQ/50g2VYq6W8y2y6r2KgcFxl+oMz7 gRY9jTcTxqFV4WeFNP4xTzdgeb6RrZJC7ZnyDg1rbgd36R+3zRfFc0qODXhUXlrr582NlCyPfGw kVulyubQkimTE4wcTuwtGM6uZeCEIyHR3DShHevD5+Np8e0B8NWvCqfsjwoeOcpD1uEadePfZmP en4xOvJYB9xkrfRY+AQ== X-Proofpoint-ORIG-GUID: ZBAQ1omQCUgXLDS5ZAbMLQS91NFm54W5 X-Authority-Analysis: v=2.4 cv=W60IkxWk c=1 sm=1 tr=0 ts=69ddf96d cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=gVE5Qc0x_BWLnb-D2gsA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-14_02,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 priorityscore=1501 spamscore=0 bulkscore=0 adultscore=0 phishscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604140077 X-Stat-Signature: prqyzbi6f9usn318dttiztkdfb6ymj8e X-Rspamd-Queue-Id: 7FC8F8000D X-Rspam-User: X-Rspamd-Server: rspam03 X-HE-Tag: 1776154997-860156 X-HE-Meta: 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 5zNXDbZu YPesbEGzSQdGKKS80vVWBsifrxIVqcW+F6jeQalbrW0Pq7nkIrjyCSjv6Atf6+WxGIUGS6WgwS0iCFOByk/f1AIemxNzL8FWHjuwDqgvygb1bmPCrRjymWvd28G+x7mTzGoLLZbpotgboGTe9kSEvq0IGy6JM9ESzDwRkCb8xXeXcwSCUuD1OHKnN0xgN2IqYRN/HSyGh7msSbt5ArUO122Y8mLNZhpWYWds+LCKVtAUY+LQxYu9RxpXbuG2O5K9ZU5ubwhdN+lB5+Nn5T8KOUB2U2w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: The hugepage-mremap selftest reserves the destination address using a anonymous base-page mapping before calling mremap() with MREMAP_FIXED, while the source region is hugetlb-backed. When remapping a hugetlb mapping into a base-page VMA may fail with: mremap: Device or resource busy This is observed on powerpc hash MMU systems where slice constraints and page size incompatibilities prevent the remap. Ensure the destination region is created using MAP_HUGETLB so that both source and destination VMAs are hugetlb-backed and compatible. Update the FLAGS macro to include MAP_HUGETLB | MAP_SHARED so that both mappings are hugetlb-backed and compatible. Also use the macro for the mmap() calls to avoid repeating the flag combination. This ensures the test reliably exercises hugetlb mremap instead of failing due to VMA type mismatch. Fixes: 12b613206474 ("mm, hugepages: add hugetlb vma mremap() test") Tested-by: Venkat Rao Bagalkote Signed-off-by: Sayali Patil --- tools/testing/selftests/mm/hugepage-mremap.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c index 68c35d1d8a5f..a442d01908cc 100644 --- a/tools/testing/selftests/mm/hugepage-mremap.c +++ b/tools/testing/selftests/mm/hugepage-mremap.c @@ -31,7 +31,7 @@ #define MB_TO_BYTES(x) (x * 1024 * 1024) #define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC) -#define FLAGS (MAP_SHARED | MAP_ANONYMOUS) +#define FLAGS (MAP_HUGETLB | MAP_SHARED) #define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1)) static void check_bytes(char *addr) @@ -131,23 +131,20 @@ int main(int argc, char *argv[]) /* mmap to a PUD aligned address to hopefully trigger pmd sharing. */ unsigned long suggested_addr = 0x7eaa40000000; - void *haddr = mmap((void *)suggested_addr, length, PROTECTION, - MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0); + void *haddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0); ksft_print_msg("Map haddr: Returned address is %p\n", haddr); if (haddr == MAP_FAILED) ksft_exit_fail_msg("mmap1: %s\n", strerror(errno)); /* mmap again to a dummy address to hopefully trigger pmd sharing. */ suggested_addr = 0x7daa40000000; - void *daddr = mmap((void *)suggested_addr, length, PROTECTION, - MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0); + void *daddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0); ksft_print_msg("Map daddr: Returned address is %p\n", daddr); if (daddr == MAP_FAILED) ksft_exit_fail_msg("mmap3: %s\n", strerror(errno)); suggested_addr = 0x7faa40000000; - void *vaddr = - mmap((void *)suggested_addr, length, PROTECTION, FLAGS, -1, 0); + void *vaddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0); ksft_print_msg("Map vaddr: Returned address is %p\n", vaddr); if (vaddr == MAP_FAILED) ksft_exit_fail_msg("mmap2: %s\n", strerror(errno)); -- 2.52.0