(1) Move cnt.v_trap increment to the beginning. There is cnt.v_vm_faults
counter in vm_fault(), so a number of hardware emulation aborts may be
get roughly as difference.
(2) Move kdb_reenter() up to not be ignored if pmap_fault() has failed.
(3) Update comments.
gp (global pointer) is used by compiler in userland only,
so re-use it for pcpup in kernel, save it on stack on switching
out to userland and load back on return to kernel.
Discussed with: jhb, andrew, kib
Sponsored by: DARPA, AFRL
Sponsored by: HEIF5
Differential Revision: https://reviews.freebsd.org/D5178
fork1 required its callers to pass a pointer to struct proc * which would
be set to the new process (if any). procdesc and racct manipulation also
used said pointer.
However, the process could have exited prior to do_fork return and be
automatically reaped, thus making this a use-after-free.
Fix the problem by letting callers indicate whether they want the pid or
the struct proc, return the process in stopped state for the latter case.
Reviewed by: kib
ext2fs: passthrough any extra timestamps to the dinode struct.
While it passed the classic testing, the change appears to have
caused some regression and still requires some more precautions.
PR: 206820
MFC after: 3 days
It turned out that devmap.c is not only file in which PTE_DEVICE
is used and simultaneously, built for both armv4 and armv6 platforms.
When I tried to build all arm kernels before r295168 commit, it was
hid by some other local changes in my tree. I hope that this is just
temporary workaround before VM_MEMATTR_DEVICE could be used instead of
PTE_DEVICE outside of pmap code for __ARM_ARCH < 6.
as otherwise platforms with strict alignment would break. It's unclear
to me if there's also a problem with access to the address list following
the structure. However we never copied the address list after the structure
and thus are pointing at random memory. For now just use a pointer to the
original memory for accessing the address list making it at least work on
platforms with weak memory access.
PR: 195445
Reported by: wolfgang lyxys.ka.sub.org
Tested by: wolfgang lyxys.ka.sub.org (x86)
MFC after: 3 days
This makes runnig f_substr() faster than it was when running under bash,
but both sh and dash are still faster when using the non-bash recipe which
features dynamically unrolled loops.
The stack must be aligned to 16 bytes at all times. Clang 3.8 is especially
adamant about this, and causes strange behavior and segmentation faults if it is
not the case.
PR: kern/206810
Device trees mark lbc as compatible with simplebus. Since simplebus is passed
first, it attaches first. When lbc's pass (default pass) comes, the bus is
already attached to simplebus, so is skipped.
Sponsored by: Alex Perez/Inertial Computing
