[Devel] [PATCH hci-8.1 4/6] ms/cgroup/dmem: Return -ENOMEM on failed pool preallocation

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> From: Guopeng Zhang <zhangguopeng at kylinos.cn>
> 
> get_cg_pool_unlocked() handles allocation failures under dmemcg_lock by
> dropping the lock, preallocating a pool with GFP_KERNEL, and retrying the
> locked lookup and creation path.
> 
> If the fallback allocation fails too, pool remains NULL. Since the loop
> condition is while (!pool), the function can keep retrying instead of
> propagating the allocation failure to the caller.
> 
> Set pool to ERR_PTR(-ENOMEM) when the fallback allocation fails so the
> loop exits through the existing common return path. The callers already
> handle ERR_PTR() from get_cg_pool_unlocked(), so this restores the
> expected error path.
> 
> Fixes: b168ed458dde ("kernel/cgroup: Add "dmem" memory accounting cgroup")
> Cc: stable at vger.kernel.org # v6.14+
> Signed-off-by: Guopeng Zhang <zhangguopeng at kylinos.cn>
> Signed-off-by: Tejun Heo <tj at kernel.org>
> (cherry picked from commit 796ad622040f7f955ccc3973085e953415920496)
> 
> https://virtuozzo.atlassian.net/browse/VSTOR-152813
> Signed-off-by: Mirian Shilakadze <mirian.shilakadze at virtuozzo.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.vzint.dev/#/patchset/20261101235155.124059-1-mirian.shilakadze@virtuozzo.com?part=4