Change in coreboot[master]: x86/smp/spinlock: Disable thread coop when taking spinlock

[Raul Rangel (Code Review)]

Attention is currently required from: Furquan Shaikh, Julius Werner.
Hello build bot (Jenkins), Furquan Shaikh,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/56320

to look at the new patch set (#2).

Change subject: x86/smp/spinlock: Disable thread coop when taking spinlock
......................................................................

x86/smp/spinlock: Disable thread coop when taking spinlock

Switching threads while holding a spinlock can lead to a deadlock. This
happens if you have two thread trying to print to the serial console
because the uart code uses udelay.

BUG=b:179699789
TEST=Boot guybrush and no longer see a deadlock when printing to
console from a second thread.

Signed-off-by: Raul E Rangel 
Change-Id: I1b929070b7f175965d4f37be693462fef26be052
---
M src/arch/x86/include/arch/smp/spinlock.h
1 file changed, 8 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/20/56320/2