linux-kernel - Re: [PATCH V2 0/6] riscv: Add GENERIC_ENTRY, IRQ

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Message-ID: <bdac65bd-175f-3f09-ae46-97d4fcc77d6f@microchip.com>
Date:   Sun, 4 Sep 2022 10:17:03 +0000
From:   <Conor.Dooley@...rochip.com>
To:     <guoren@...nel.org>, <arnd@...db.de>, <palmer@...osinc.com>,
        <tglx@...utronix.de>, <peterz@...radead.org>, <luto@...nel.org>,
        <heiko@...ech.de>, <jszhang@...nel.org>, <lazyparser@...il.com>,
        <falcon@...ylab.org>, <chenhuacai@...nel.org>,
        <apatel@...tanamicro.com>, <atishp@...shpatra.org>,
        <palmer@...belt.com>, <paul.walmsley@...ive.com>
CC:     <linux-arch@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <guoren@...ux.alibaba.com>
Subject: Re: [PATCH V2 0/6] riscv: Add GENERIC_ENTRY, IRQ_STACKS support

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@...nel.org wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> From: Guo Ren <guoren@...ux.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@...el.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
>