On Sun, 2020-03-29 at 09:44 -0700, Thomas Skibo wrote: > On Sun, Mar 29, 2020 at 12:29:00AM -0700, Mark Millard via freebsd- > arm wrote: > > While trying to update the head version > > in use I ran into boot hangups on the > > OrangePi+ 2e and did an approximate > > bisect of artificact.freebsd.org kernels > > to find approximately which kernel > > version the issue started at. > > > > I found that head -r359309 boots and > > -r359311 fails (shown later below). > > The original update attempt was from > > -r359966 to -r359376 and -r359376 > > stopped there as well. (I kept world > > there and varied the kernel version > > for the approximate bisect activity.) > > > > It seems that at least one of the > > "MI-namespace" atomics added do not work > > in all its usage-contexts on the cortexA7 > > (armv7) involved. > > It looks like my previous reply didn't go to the mailing lists. I'm > new to > mutt. > > Anyway, I looked at this problem yesterday and it seems r359311 > enables > using some atomic operations that were not being used until now. In > particular, atomic_fcmpset_8() seems broken and hangs up > in vm_page_bits_swap(). I think I have a fix but I want to run it > by Ian. > > --Thomas > > Index: sys/arm/include/atomic-v6.h > =================================================================== > --- sys/arm/include/atomic-v6.h (revision 359412) > +++ sys/arm/include/atomic-v6.h (working copy) > _at__at_ -196,7 +196,7 _at__at_ > \ > __asm __volatile( \ > "1: ldrex" SUF " %[tmp], [%[ptr]] \n" \ > - " ldr %[ret], [%[oldv]] \n" \ > + " ldr" SUF " %[ret], [%[oldv]] \n" \ > " teq %[tmp], %[ret] \n" \ > " ittee ne \n" \ > " str" SUF "ne %[tmp], [%[oldv]] \n" \ > I've committed this fix as r359423, thanks! -- IanReceived on Sun Mar 29 2020 - 15:58:47 UTC
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