+ selftests-mm-hmm-tests-include-linux-mmanh-to-access-madv_collapse.patch added to mm-hotfixes-unstable branch

+ selftests-mm-hmm-tests-include-linux-mmanh-to-access-madv_collapse.patch added to mm-hotfixes-unstable branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: hmm-tests: include linux/mman.h to access MADV_COLLAPSE
has been added to the -mm mm-hotfixes-unstable branch.  Its filename is
     selftests-mm-hmm-tests-include-linux-mmanh-to-access-madv_collapse.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-hmm-tests-include-linux-mmanh-to-access-madv_collapse.patch

This patch will later appear in the mm-hotfixes-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Zenghui Yu <zenghui.yu@linux.dev>
Subject: selftests/mm: hmm-tests: include linux/mman.h to access MADV_COLLAPSE
Date: Sun, 28 Jun 2026 22:31:11 +0800

The following compilation error occurs with an old version of glibc due to
a recent commit adding MADV_COLLAPSE testing:

 [root@localhost mm]# getconf GNU_LIBC_VERSION
 glibc 2.34
 [root@localhost mm]# make
   CC       hmm-tests
 hmm-tests.c: In function 'hmm_migrate_anon_huge_fault':
 hmm-tests.c:2355:27: error: 'MADV_COLLAPSE' undeclared (first use in this function); did you mean 'MADV_COLD'?
  2355 |  ret = madvise(map, size, MADV_COLLAPSE);
       |                           ^~~~~~~~~~~~~
       |                           MADV_COLD
 hmm-tests.c:2355:27: note: each undeclared identifier is reported only once for each function it appears in
 make: *** [../lib.mk:225: /root/code/linux/tools/testing/selftests/mm/hmm-tests] Error 1

Include linux/mman.h (which provides the definition of MADV_COLLAPSE) to
fix the build error.

Link: https://lore.kernel.org/20260628143111.36863-1-zenghui.yu@linux.dev
Fixes: e3d8707358ea ("selftests/mm/hmm-tests: test pagemap reads of PMD device-private entries")
Signed-off-by: Zenghui Yu <zenghui.yu@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/hmm-tests.c |    1 +
 1 file changed, 1 insertion(+)

--- a/tools/testing/selftests/mm/hmm-tests.c~selftests-mm-hmm-tests-include-linux-mmanh-to-access-madv_collapse
+++ a/tools/testing/selftests/mm/hmm-tests.c
@@ -23,6 +23,7 @@
 #include <time.h>
 #include <pthread.h>
 #include <limits.h>
+#include <linux/mman.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
_

Patches currently in -mm which might be from zenghui.yu@linux.dev are

selftests-mm-pagemap_ioctl-use-the-correct-page-size-for-transact_test.patch
selftests-mm-hmm-tests-include-linux-mmanh-to-access-madv_collapse.patch
tools-mm-add-thp_swap_allocator_test-binary-to-gitignore.patch
docs-pagemap-fix-flags-location-member-name-and-sample-code.patch