"brcm,bcm2835-aux-uart" and returns the appropriate core clock based
results; otherwise it returns the uart clock from firmware.
Should fix early console output on the rpi0w.
Based on a diff from mlelstv
- Use mmcpwrseq resources if available
- Only set 4- or 8-bit mode if specified in the dt properties
- Add quirk for implementations with inverted power enable logic
- Support switching signal voltage between 1.8V and 3.3V
- Fix a clock divider issue on Rockchip SoCs
overflow. On my test build at least, by luck, the compiler orders the
variables in a way that the overflow hits only local structures which
haven't yet been initialized and used, so the overflow is harmless.
Very easily seeable with kASan - just invoke the syscall from a 32bit
binary.
crafting the former the device can leak stack data. By crafting the latter
the device can overwrite the stack. The combination of the two means the
device can ROP the kernel and obtain code execution (demonstrated with an
actual exploit over vHCI).
Truncate the lengths to the size of the buffers, and also drop sc_ilen
since it is unused. Patch tested with vHCI+kASan.
of page interlocks. Require that the page interlock be held over calls to
uvm_pageactivate(), uvm_pagewire() and similar.
- Solve the concurrency problem with page replacement state. Rather than
updating the global state synchronously, set an intended state on
individual pages (active, inactive, enqueued, dequeued) while holding the
page interlock. After the interlock is released put the pages on a 128
entry per-CPU queue for their state changes to be made real in batch.
This results in in a ~400 fold decrease in contention on my test system.
Proposed on tech-kern but modified to use the page interlock rather than
atomics to synchronise as it's much easier to maintain that way, and
cheaper.
uvmpdpol at the start of the structure, so that while under global lock we
need only touch one cache line for each vm_page. There is still the problem
of vm_page not being aligned, but this seems to drop lock wait time for
(a modified) uvmpdpol and the allocator by 20-30% in a quick test.
