spin_unlock_bh() and preempt_check_resched()

[Samuel Thibault <samuel.thibault@ens-lyon.org>]

Hi,

I'm wondering about macros like _spin_unlock_bh(lock):
do { \
        _raw_spin_unlock(lock); \
        preempt_enable(); \
        local_bh_enable(); \
        __release(lock); \
} while (0)

Is there a reason for using preempt_enable() instead of a simple
preempt_enable_no_resched() ?

Since we know bottom halves are disabled, preempt_schedule() will always
return at once (preempt_count!=0), and hence preempt_check_resched() is
useless here...

Regards,
Samuel
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