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SubjectRe: [PATCH v2 3/3] mm: vmalloc: Replace BUG_ON() by WARN_ON_ONCE()
On Wed, Dec 21, 2022 at 06:44:54PM +0100, Uladzislau Rezki (Sony) wrote:
> Currently a vm_unmap_ram() functions triggers a BUG() if an area
> is not found. Replace it by the WARN_ON_ONCE() error message and
> keep machine alive instead of stopping it.
>
> The worst case is a memory leaking.
>
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
> ---
> mm/vmalloc.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 17e688cc7357..221d8950e13c 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2252,7 +2252,9 @@ void vm_unmap_ram(const void *mem, unsigned int count)
> }
>
> va = find_unlink_vmap_area(addr);
> - BUG_ON(!va);
> + if (WARN_ON_ONCE(!va))
> + return;
> +
> debug_check_no_locks_freed((void *)va->va_start,
> (va->va_end - va->va_start));
> free_unmap_vmap_area(va);
> --
> 2.30.2
>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>

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