[PATCH 0/7] riscv: Correctly handle IPIs already pending upon boot

[Sean Anderson <seanga2@gmail.com>]

On the K210, the prior stage bootloader does not clear IPIs. This presents
a problem, because U-Boot up until this point assumes (with one exception)
that IPIs are cleared when it starts. This series attempts to fix this in a
robust manner, and fix several concurrency bugs I noticed while fixing
these other areas. Heinrich previously submitted a patch addressing part of
this problem in [1].

[1] https://patchwork.ozlabs.org/project/uboot/patch/20200811035648.3284-1-xypron.glpk at gmx.de/


Sean Anderson (7):
  Revert "riscv: Clear pending interrupts before enabling IPIs"
  riscv: Match memory barriers between send_ipi_many and handle_ipi
  riscv: Use NULL as a sentinel value for smp_call_function
  riscv: Clear pending IPIs on initialization
  riscv: Add fence to available_harts_lock
  riscv: Ensure gp is NULL or points to valid data
  riscv: Add some comments to start.S

 arch/riscv/cpu/cpu.c        | 18 ++++++++++++++
 arch/riscv/cpu/start.S      | 47 +++++++++++++++++++++++++++++--------
 arch/riscv/lib/interrupts.c |  3 ++-
 arch/riscv/lib/smp.c        | 26 +++++++++++++++++---
 4 files changed, 80 insertions(+), 14 deletions(-)

-- 
2.28.0