The patch titled
Subject: mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix
has been added to the -mm mm-unstable branch. Its filename is
mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix
Date: Thu, 26 Dec 2024 12:03:35 -0800
vma->vm_refcnt does not exist when CONFIG_PER_VMA_LOCK=n, therefore when
CONFIG_PER_VMA_LOCK=n and CONFIG_DEBUG_VM=y we need to avoid its usage in
dump_vma().
Link: https://lkml.kernel.org/r/20241226200335.1250078-1-surenb@xxxxxxxxxx
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202412270328.HiJX1mRt-lkp@xxxxxxxxx/
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/debug.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/mm/debug.c~mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix
+++ a/mm/debug.c
@@ -178,6 +178,7 @@ EXPORT_SYMBOL(dump_page);
void dump_vma(const struct vm_area_struct *vma)
{
+#ifdef CONFIG_PER_VMA_LOCK
pr_emerg("vma %px start %px end %px mm %px\n"
"prot %lx anon_vma %px vm_ops %px\n"
"pgoff %lx file %px private_data %px\n"
@@ -187,6 +188,17 @@ void dump_vma(const struct vm_area_struc
vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
vma->vm_file, vma->vm_private_data,
vma->vm_flags, &vma->vm_flags, refcount_read(&vma->vm_refcnt));
+#else
+ pr_emerg("vma %px start %px end %px mm %px\n"
+ "prot %lx anon_vma %px vm_ops %px\n"
+ "pgoff %lx file %px private_data %px\n"
+ "flags: %#lx(%pGv)\n",
+ vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm,
+ (unsigned long)pgprot_val(vma->vm_page_prot),
+ vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
+ vma->vm_file, vma->vm_private_data,
+ vma->vm_flags, &vma->vm_flags);
+#endif
}
EXPORT_SYMBOL(dump_vma);
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
seqlock-add-raw_seqcount_try_begin.patch
mm-convert-mm_lock_seq-to-a-proper-seqcount.patch
mm-introduce-mmap_lock_speculate_try_beginretry.patch
mm-introduce-vma_start_read_locked_nested-helpers.patch
mm-move-per-vma-lock-into-vm_area_struct.patch
mm-mark-vma-as-detached-until-its-added-into-vma-tree.patch
mm-modify-vma_iter_store_gfp-to-indicate-if-its-storing-a-new-vma.patch
mm-mark-vmas-detached-upon-exit.patch
mm-nommu-fix-the-last-places-where-vma-is-not-locked-before-being-attached.patch
types-move-struct-rcuwait-into-typesh.patch
mm-allow-vma_start_read_locked-vma_start_read_locked_nested-to-fail.patch
mm-move-mmap_init_lock-out-of-the-header-file.patch
mm-uninline-the-main-body-of-vma_start_write.patch
refcount-introduce-__refcount_addinc_not_zero_limited.patch
mm-replace-vm_lock-and-detached-flag-with-a-reference-count.patch
mm-debug-print-vm_refcnt-state-when-dumping-the-vma.patch
mm-debug-print-vm_refcnt-state-when-dumping-the-vma-fix.patch
mm-remove-extra-vma_numab_state_init-call.patch
mm-prepare-lock_vma_under_rcu-for-vma-reuse-possibility.patch
mm-make-vma-cache-slab_typesafe_by_rcu.patch
docs-mm-document-latest-changes-to-vm_lock.patch
