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mm/balloon_compaction: improve comments for WARN_ON_ONCE(!b_dev_info)

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Let's clarify a bit by extending the comments.

Link: https://lkml.kernel.org/r/20260119230133.3551867-5-david@kernel.org
Signed-off-by: David Hildenbrand (Red Hat) <david@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Eugenio Pérez <eperezma@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Jerrin Shaji George <jerrin.shaji-george@broadcom.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: SeongJae Park <sj@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand (Red Hat) 2026-01-20 00:01:12 +01:00 committed by Andrew Morton
parent 5b3342cbf0
commit 6af05dfe9a
1 changed files with 10 additions and 2 deletions
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12
mm/balloon_compaction.c
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@ -222,7 +222,11 @@ static void balloon_page_putback(struct page *page)
struct balloon_dev_info *b_dev_info = balloon_page_device(page);
unsigned long flags;
/* Isolated balloon pages cannot get deflated. */
/*
* When we isolated the page, the page was still inflated in a balloon
* device. As isolated balloon pages cannot get deflated, we still have
* a balloon device here.
*/
if (WARN_ON_ONCE(!b_dev_info))
return;
@ -241,7 +245,11 @@ static int balloon_page_migrate(struct page *newpage, struct page *page,
VM_BUG_ON_PAGE(!PageLocked(page), page);
VM_BUG_ON_PAGE(!PageLocked(newpage), newpage);
/* Isolated balloon pages cannot get deflated. */
/*
* When we isolated the page, the page was still inflated in a balloon
* device. As isolated balloon pages cannot get deflated, we still have
* a balloon device here.
*/
if (WARN_ON_ONCE(!balloon))
return -EAGAIN;