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kernel: Remove legacy preemption checking

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The metairq feature exposed the fact that all of our arch code (and a
few mistaken spots in the scheduler too) was trying to interpret
"preemptible" threads independently.

As of the scheduler rewrite, that logic is entirely within sched.c and
doing it externally is redundant.  And now that "cooperative" threads
can be preempted, it's wrong and produces test failures when used with
metairq threads.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-05-23 14:06:22 -07:00 • committed by Andrew Boie
commit 3a0cb2d35d
9 changed files with 2 additions and 71 deletions
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8
arch/arm/core/exc_exit.S
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@ -75,14 +75,6 @@ SECTION_SUBSEC_FUNC(TEXT, _HandlerModeExit, _ExcExit)
ldr r1, [r0, #_kernel_offset_to_current]
/*
* Non-preemptible thread ? Do not schedule (see explanation of
* preempt field in kernel_struct.h).
*/
ldrh r2, [r1, #_thread_offset_to_preempt]
cmp r2, #_PREEMPT_THRESHOLD
bhi _EXIT_EXC
ldr r0, [r0, _kernel_offset_to_ready_q_cache]
cmp r0, r1
beq _EXIT_EXC