[PATCH V2 0/6] riscv: Add GENERIC_ENTRY, IRQ_STACKS support

[guoren]

From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

The patches convert riscv to use the generic entry infrastructure from
kernel/entry/*. Add independent irq stacks (IRQ_STACKS) for percpu to
prevent kernel stack overflows. Add the HAVE_SOFTIRQ_ON_OWN_STACK
feature for the IRQ_STACKS config. You can try it directly with [1].

[1] https://github.com/guoren83/linux/tree/generic_entry_v2

Changes in V2:
 - Fixup compile error by include "riscv: ptrace: Remove duplicate
   operation"
   https://lore.kernel.org/linux-riscv/20220903162328.1952477-2-guoren@xxxxxxxxxx/T/#u
 - Fixup compile warning
   Reported-by: kernel test robot <lkp@xxxxxxxxx>
 - Add test repo link in cover letter

Guo Ren (6):
  riscv: ptrace: Remove duplicate operation
  riscv: convert to generic entry
  riscv: Support HAVE_IRQ_EXIT_ON_IRQ_STACK
  riscv: Support HAVE_SOFTIRQ_ON_OWN_STACK
  riscv: elf_kexec: Fixup compile warning
  riscv: compat_syscall_table: Fixup compile warning

 arch/riscv/Kconfig                    |  10 +
 arch/riscv/include/asm/csr.h          |   1 -
 arch/riscv/include/asm/entry-common.h |   8 +
 arch/riscv/include/asm/irq.h          |   3 +
 arch/riscv/include/asm/ptrace.h       |  10 +-
 arch/riscv/include/asm/stacktrace.h   |   5 +
 arch/riscv/include/asm/syscall.h      |   6 +
 arch/riscv/include/asm/thread_info.h  |  15 +-
 arch/riscv/include/asm/vmap_stack.h   |  28 +++
 arch/riscv/kernel/Makefile            |   1 +
 arch/riscv/kernel/elf_kexec.c         |   4 +
 arch/riscv/kernel/entry.S             | 255 +++++---------------------
 arch/riscv/kernel/irq.c               |  75 ++++++++
 arch/riscv/kernel/ptrace.c            |  41 -----
 arch/riscv/kernel/signal.c            |  21 +--
 arch/riscv/kernel/sys_riscv.c         |  26 +++
 arch/riscv/kernel/traps.c             |  11 ++
 arch/riscv/mm/fault.c                 |  12 +-
 18 files changed, 250 insertions(+), 282 deletions(-)
 create mode 100644 arch/riscv/include/asm/entry-common.h
 create mode 100644 arch/riscv/include/asm/vmap_stack.h

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2.36.1