Add an 'initialized' field to struct percpu_counter to track whether
a counter has been properly initialized. Update percpu_counter_init()
to set this field and percpu_counter_initialized() to check it.
This is needed because ext4 uses percpu_counter_initialized() to check
if counters are ready before accessing them.
Co-developed-by: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
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