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SubjectPREEMPT is messing with everyone
Hi,

preempt stuff SHOULD only stay in #ifdef CONFIG_PREEMP_* , but it is
messing with everyone even though not defined.

e.g.

1. linux-2.6.19/kernel/spinlock.c

Line 18: #include <linux/preempt.h>

Line 26: preempt_disable();

Line 32: preempt_disable();

and so on .

2. linux-2.6.19/kernel/sched.c

Line 1096: int preempted;

Line 1104: preempted = !task_running(rq, p);

Line 1106: if (preempted)

Line 2059: if (TASK_PREEMPTS_CURR(p, this_rq))

Line 3355: current->comm, preempt_count(), current->pid);

Line 3342: preempt_disable();

Line 3375: if (prev->state && !(preempt_count() & PREEMPT_ACTIVE)) {

Line 3471: preempt_enable_no_resched();

3. linux-2.6.19/kernel/timer.c

Line 444: int preempt_count = preempt_count();

Line 447: if (preempt_count != preempt_count()) {

4. linux-2.6.19/arch/i386/kernel/entry.S

Line 240: preempt_stop

5. linux-2.6.19/arch/i386/irq.c

Line 111: irqctx->tinfo.preempt_count =

Line 112: (irqctx->tinfo.preempt_count & ~SOFTIRQ_MASK) |

Line 113: (curctx->tinfo.preempt_count & SOFTIRQ_MASK);

Line 160: irqctx->tinfo.preempt_count = HARDIRQ_OFFSET;

and so on.

Similarly unnecessary preempt code is also written in other important files.

70 to 80 % of this code is removed when compiled.

but 20 to 30 % code left in binary kernel image.

Why Linux kernel is wasting its resources which is not defined at all.

Any solution ?

Thank you,

Best Regards,

Jaswinder Singh.
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