In kernel/sched.c the return value from preempt_count() is cast to an int. That made sense when preempt_count was defined as different types on is not needed and should go away. The patch removes the cast. In kernel/timer.c the return value from preempt_count() is assigned to a variable of type u32 and then that unsigned value is later compared to preempt_count(). Since preempt_count() returns an int, an int is what should be used to store its return value. Storing the result in an unsigned 32bit integer made a tiny bit of sense back when preempt_count was different types on different archs, but no more - let's not play signed vs unsigned comparison games when we don't have to. The patch modifies the code to use an int to hold the value. While I was around that bit of code I also made two changes to a nearby (related) printk() - I modified it to specify the loglevel explicitly and also broke the line into a few pieces to avoid it being longer than 80 chars and clarified the text a bit.
Showing the changes to kernel/timer.c (1 of 2 files). Show all
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| @@ -489,10 +489,14 @@ static inline void __run_timers(tvec_base_t *base) · 488 unmodified lines | ||
| 489 | 489 | detach_timer(timer, 1); |
| 490 | 490 | spin_unlock_irq(&base->t_base.lock); |
| 491 | 491 | { |
| 492 | − u32 preempt_count = preempt_count(); | |
| 492 | + int preempt_count = preempt_count(); | |
| 493 | 493 | fn(data); |
| 494 | 494 | if (preempt_count != preempt_count()) { |
| 495 | − printk("huh, entered %p with %08x, exited with %08x?\n", fn, preempt_count, preempt_count()); | |
| 495 | + printk(KERN_WARNING "huh, entered %p " | |
| 496 | + "with preempt_count %08x, exited" | |
| 497 | + " with %08x?\n", | |
| 498 | + fn, preempt_count, | |
| 499 | + preempt_count()); | |
| 496 | 500 | BUG(); |
| 497 | 501 | } |
| 498 | 502 | } |