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samples/damon/mtier: avoid starting DAMON before initialization

Commit 964314344eab ("samples/damon/mtier: support boot time enable
setup") is somehow incompletely applying the origin patch [1]. It is
missing the part that avoids starting DAMON before module initialization.
Probably a mistake during a merge has happened. Fix it by applying the
missed part again.

Link: https://lkml.kernel.org/r/20250909022238.2989-4-sj@kernel.org
Link: https://lore.kernel.org/20250706193207.39810-4-sj@kernel.org [1]
Fixes: 964314344eab ("samples/damon/mtier: support boot time enable setup")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

SeongJae Park and committed by
Andrew Morton c62cff40 e6b733ca

+3
+3
samples/damon/mtier.c
··· 208 208 if (enabled == is_enabled) 209 209 return 0; 210 210 211 + if (!init_called) 212 + return 0; 213 + 211 214 if (enabled) { 212 215 err = damon_sample_mtier_start(); 213 216 if (err)