{"id":2220080,"url":"http://patchwork.ozlabs.org/api/patches/2220080/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/a4c1dd0e2b83cc06ea84bd04e6a86ca6d51efb67.1775466330.git.sayalip@linux.ibm.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/","list_archive_url":"https://lore.kernel.org/linuxppc-dev/","list_archive_url_format":"https://lore.kernel.org/linuxppc-dev/{}/","commit_url_format":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}"},"msgid":"","list_archive_url":"https://lore.kernel.org/linuxppc-dev/a4c1dd0e2b83cc06ea84bd04e6a86ca6d51efb67.1775466330.git.sayalip@linux.ibm.com/","date":"2026-04-06T09:19:29","name":"[v4,10/15] selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"9bab1eb558fdf72feefa79208e6eefbb78c63d83","submitter":{"id":92656,"url":"http://patchwork.ozlabs.org/api/people/92656/?format=json","name":"Sayali Patil","email":"sayalip@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/a4c1dd0e2b83cc06ea84bd04e6a86ca6d51efb67.1775466330.git.sayalip@linux.ibm.com/mbox/","series":[{"id":498833,"url":"http://patchwork.ozlabs.org/api/series/498833/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498833","date":"2026-04-06T09:19:22","name":"selftests/mm: fix failures and robustness improvements","version":4,"mbox":"http://patchwork.ozlabs.org/series/498833/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2220080/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220080/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n 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","To":"Andrew Morton , Shuah Khan ,\n linux-mm@kvack.org, linux-kernel@vger.kernel.org,\n linux-kselftest@vger.kernel.org,\n Ritesh Harjani ","Cc":"David Hildenbrand , Zi Yan ,\n Michal Hocko , Oscar Salvador ,\n Lorenzo Stoakes ,\n Dev Jain , Liam.Howlett@oracle.com,\n linuxppc-dev@lists.ozlabs.org, Miaohe Lin ,\n Venkat Rao Bagalkote ,\n Sayali Patil ","Subject":"[PATCH v4 10/15] selftests/mm: ensure destination is hugetlb-backed\n in hugepage-mremap","Date":"Mon, 6 Apr 2026 14:49:29 +0530","Message-ID":"\n ","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"","References":"","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-TM-AS-GCONF":"00","X-Proofpoint-Reinject":"loops=2 maxloops=12","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDA2MDA5MCBTYWx0ZWRfX+HqQvBPdjI7l\n 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engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-06_02,2026-04-03_01,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n impostorscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0\n malwarescore=0 spamscore=0 phishscore=0 priorityscore=1501 bulkscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604060090","X-Spam-Status":"No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org"},"content":"The hugepage-mremap selftest reserves the destination address using a\nanonymous base-page mapping before calling mremap() with MREMAP_FIXED,\nwhile the source region is hugetlb-backed.\n\nWhen remapping a hugetlb mapping into a base-page VMA may fail with:\n\n mremap: Device or resource busy\n\nThis is observed on powerpc hash MMU systems where slice constraints\nand page size incompatibilities prevent the remap.\n\nEnsure the destination region is created using MAP_HUGETLB so that both\nsource and destination VMAs are hugetlb-backed and compatible.\n\nUpdate the FLAGS macro to include MAP_HUGETLB | MAP_SHARED\nso that both mappings are hugetlb-backed and compatible.\nAlso use the macro for the mmap() calls to avoid repeating\nthe flag combination.\n\nThis ensures the test reliably exercises hugetlb mremap instead of\nfailing due to VMA type mismatch.\n\nFixes: 12b613206474 (\"mm, hugepages: add hugetlb vma mremap() test\")\nSigned-off-by: Sayali Patil \n---\n tools/testing/selftests/mm/hugepage-mremap.c | 11 ++++-------\n 1 file changed, 4 insertions(+), 7 deletions(-)","diff":"diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c\nindex 68c35d1d8a5f..a442d01908cc 100644\n--- a/tools/testing/selftests/mm/hugepage-mremap.c\n+++ b/tools/testing/selftests/mm/hugepage-mremap.c\n@@ -31,7 +31,7 @@\n #define MB_TO_BYTES(x) (x * 1024 * 1024)\n \n #define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC)\n-#define FLAGS (MAP_SHARED | MAP_ANONYMOUS)\n+#define FLAGS (MAP_HUGETLB | MAP_SHARED)\n #define ALIGN(x, a) (((x) + ((a) - 1)) & ~((a) - 1))\n \n static void check_bytes(char *addr)\n@@ -131,23 +131,20 @@ int main(int argc, char *argv[])\n \n \t/* mmap to a PUD aligned address to hopefully trigger pmd sharing. */\n \tunsigned long suggested_addr = 0x7eaa40000000;\n-\tvoid *haddr = mmap((void *)suggested_addr, length, PROTECTION,\n-\t\t\t MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);\n+\tvoid *haddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);\n \tksft_print_msg(\"Map haddr: Returned address is %p\\n\", haddr);\n \tif (haddr == MAP_FAILED)\n \t\tksft_exit_fail_msg(\"mmap1: %s\\n\", strerror(errno));\n \n \t/* mmap again to a dummy address to hopefully trigger pmd sharing. */\n \tsuggested_addr = 0x7daa40000000;\n-\tvoid *daddr = mmap((void *)suggested_addr, length, PROTECTION,\n-\t\t\t MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);\n+\tvoid *daddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);\n \tksft_print_msg(\"Map daddr: Returned address is %p\\n\", daddr);\n \tif (daddr == MAP_FAILED)\n \t\tksft_exit_fail_msg(\"mmap3: %s\\n\", strerror(errno));\n \n \tsuggested_addr = 0x7faa40000000;\n-\tvoid *vaddr =\n-\t\tmmap((void *)suggested_addr, length, PROTECTION, FLAGS, -1, 0);\n+\tvoid *vaddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);\n \tksft_print_msg(\"Map vaddr: Returned address is %p\\n\", vaddr);\n \tif (vaddr == MAP_FAILED)\n \t\tksft_exit_fail_msg(\"mmap2: %s\\n\", strerror(errno));\n","prefixes":["v4","10/15"]}