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| author |   Sumanth Korikkar <sumanthk@linux.ibm.com> | 2025-08-07 20:35:45 +0200 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2025-08-27 22:45:43 -0700 |
| commit | c3576889d87b603cb66b417e08844a53c1077a37 (patch) | |
| tree | 8b7a41c86d02281522b376043422c2417f9dfd5b /rust/pin-init/internal/src | |
| parent | mm/damon/core: prevent unnecessary overflow in damos_set_effective_quota() (diff) | |
| download | wireguard-linux-c3576889d87b603cb66b417e08844a53c1077a37.tar.xz wireguard-linux-c3576889d87b603cb66b417e08844a53c1077a37.zip | |
mm: fix accounting of memmap pages
For !CONFIG_SPARSEMEM_VMEMMAP, memmap page accounting is currently done
upfront in sparse_buffer_init(). However, sparse_buffer_alloc() may
return NULL in failure scenario.
Also, memmap pages may be allocated either from the memblock allocator
during early boot or from the buddy allocator. When removed via
arch_remove_memory(), accounting of memmap pages must reflect the original
allocation source.
To ensure correctness:
* Account memmap pages after successful allocation in sparse_init_nid()
and section_activate().
* Account memmap pages in section_deactivate() based on allocation
source.
Link: https://lkml.kernel.org/r/20250807183545.1424509-1-sumanthk@linux.ibm.com
Fixes: 15995a352474 ("mm: report per-page metadata information")
Signed-off-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Wei Yang <richard.weiyang@gmail.com>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'rust/pin-init/internal/src')
0 files changed, 0 insertions, 0 deletions