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

Conor.Dooley
2022-09-04T10:17:16Z

Hey Guo Ren,
(off topic: is Guo or Ren your given name?)

This series seems to introduce a build warning:

arch/riscv/kernel/irq.c:17:1: warning: symbol 'irq_stack_ptr' was not declared. Should it be static?

One more comment below:

On 04/09/2022 08:26, guoren@kernel.org wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> From: Guo Ren <guoren@linux.alibaba.com>
>
> 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@kernel.org/T/#u

I find this really confusing. The same patch is in two different series?
Is the above series no longer required & this is a different approach?
Thanks,
Conor.

> - Fixup compile warning
> Reported-by: kernel test robot <lkp@intel.com>
> - 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
>
> --
> 2.36.1
>