{"id":2223024,"url":"http://patchwork.ozlabs.org/api/patches/2223024/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/37b8bdb379a845beaba645c104fb0cc31aca57ac.1776150071.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":"<37b8bdb379a845beaba645c104fb0cc31aca57ac.1776150071.git.sayalip@linux.ibm.com>","list_archive_url":"https://lore.kernel.org/linuxppc-dev/37b8bdb379a845beaba645c104fb0cc31aca57ac.1776150071.git.sayalip@linux.ibm.com/","date":"2026-04-14T08:22:03","name":"[v5,09/14] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap","commit_ref":null,"pull_url":null,"state":"handled-elsewhere","archived":false,"hash":"dc858f369600208a1d82a1ef3abf888c0d7b0265","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/37b8bdb379a845beaba645c104fb0cc31aca57ac.1776150071.git.sayalip@linux.ibm.com/mbox/","series":[{"id":499800,"url":"http://patchwork.ozlabs.org/api/series/499800/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499800","date":"2026-04-14T08:21:54","name":"selftests/mm: fix failures and robustness improvements","version":5,"mbox":"http://patchwork.ozlabs.org/series/499800/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223024/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223024/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 v5 09/14] selftest/mm: register existing mapping with\n userfaultfd in hugepage-mremap","Date":"Tue, 14 Apr 2026 13:52:03 +0530","Message-ID":"\n <37b8bdb379a845beaba645c104fb0cc31aca57ac.1776150071.git.sayalip@linux.ibm.com>","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 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anonymous\nmapping and overwrote the address supplied by the caller before\nregistering the range with userfaultfd.\n\nAs a result, userfaultfd was applied to an unrelated anonymous mapping\ninstead of the hugetlb region used by the test.\n\nRemove the extra mmap() and register the caller-provided address range\ndirectly using UFFDIO_REGISTER_MODE_MISSING, so that faults are\ngenerated for the hugetlb mapping used by the test.\n\nThis ensures userfaultfd operates on the actual hugetlb test region and\nvalidates the expected fault handling.\n\nBefore patch:\n running ./hugepage-mremap\n -------------------------\n TAP version 13\n 1..1\n Map haddr: Returned address is 0x7eaa40000000\n Map daddr: Returned address is 0x7daa40000000\n Map vaddr: Returned address is 0x7faa40000000\n Address returned by mmap() = 0x7fff9d000000\n Mremap: Returned address is 0x7faa40000000\n First hex is 0\n First hex is 3020100\n ok 1 Read same data\n Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0\n [PASS]\n ok 1 hugepage-mremap\n\nAfter patch:\n running ./hugepage-mremap\n -------------------------\n TAP version 13\n 1..1\n Map haddr: Returned address is 0x7eaa40000000\n Map daddr: Returned address is 0x7daa40000000\n Map vaddr: Returned address is 0x7faa40000000\n Registered memory at address 0x7eaa40000000 with userfaultfd\n Mremap: Returned address is 0x7faa40000000\n First hex is 0\n First hex is 3020100\n ok 1 Read same data\n Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0\n [PASS]\n ok 1 hugepage-mremap\n\nFixes: 12b613206474 (\"mm, hugepages: add hugetlb vma mremap() test\")\nAcked-by: David Hildenbrand (Arm) \nTested-by: Venkat Rao Bagalkote \nSigned-off-by: Sayali Patil \n---\n tools/testing/selftests/mm/hugepage-mremap.c | 21 +++++---------------\n 1 file changed, 5 insertions(+), 16 deletions(-)","diff":"diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c\nindex f66e4d806477..68c35d1d8a5f 100644\n--- a/tools/testing/selftests/mm/hugepage-mremap.c\n+++ b/tools/testing/selftests/mm/hugepage-mremap.c\n@@ -86,25 +86,14 @@ static void register_region_with_uffd(char *addr, size_t len)\n \tif (ioctl(uffd, UFFDIO_API, &uffdio_api) == -1)\n \t\tksft_exit_fail_msg(\"ioctl-UFFDIO_API: %s\\n\", strerror(errno));\n \n-\t/* Create a private anonymous mapping. The memory will be\n-\t * demand-zero paged--that is, not yet allocated. When we\n-\t * actually touch the memory, it will be allocated via\n-\t * the userfaultfd.\n-\t */\n-\n-\taddr = mmap(NULL, len, PROT_READ | PROT_WRITE,\n-\t\t MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n-\tif (addr == MAP_FAILED)\n-\t\tksft_exit_fail_msg(\"mmap: %s\\n\", strerror(errno));\n-\n-\tksft_print_msg(\"Address returned by mmap() = %p\\n\", addr);\n-\n-\t/* Register the memory range of the mapping we just created for\n-\t * handling by the userfaultfd object. In mode, we request to track\n-\t * missing pages (i.e., pages that have not yet been faulted in).\n+\t/* Register the passed memory range for handling by the userfaultfd object.\n+\t * In mode, we request to track missing pages\n+\t * (i.e., pages that have not yet been faulted in).\n \t */\n \tif (uffd_register(uffd, addr, len, true, false, false))\n \t\tksft_exit_fail_msg(\"ioctl-UFFDIO_REGISTER: %s\\n\", strerror(errno));\n+\n+\tksft_print_msg(\"Registered memory at address %p with userfaultfd\\n\", addr);\n }\n \n int main(int argc, char *argv[])\n","prefixes":["v5","09/14"]}