linux-kernel - Re: [PATCH V2 2/9] fork: pass worker_flags to copy

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Message-ID: <20210922124245.m4gucclabgyijqei@wittgenstein>
Date:   Wed, 22 Sep 2021 14:42:45 +0200
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Mike Christie <michael.christie@...cle.com>
Cc:     hdanton@...a.com, hch@...radead.org, stefanha@...hat.com,
        jasowang@...hat.com, mst@...hat.com, sgarzare@...hat.com,
        virtualization@...ts.linux-foundation.org, axboe@...nel.dk,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 2/9] fork: pass worker_flags to copy_thread

On Tue, Sep 21, 2021 at 04:52:11PM -0500, Mike Christie wrote:
> We need to break up PF_IO_WORKER into the parts that are used for
> scheduling and signal handling and the part that tells copy_thread to
> treat it as a special type of thread during setup. This patch passes the
> worker_flags to copy_thread, so in the next patch we can add new worker
> flags that function can see.
> 
> Signed-off-by: Mike Christie <michael.christie@...cle.com>
> ---
>  arch/alpha/kernel/process.c      | 2 +-
>  arch/arc/kernel/process.c        | 2 +-
>  arch/arm/kernel/process.c        | 3 ++-
>  arch/arm64/kernel/process.c      | 3 ++-
>  arch/csky/kernel/process.c       | 3 ++-
>  arch/h8300/kernel/process.c      | 3 ++-
>  arch/hexagon/kernel/process.c    | 2 +-
>  arch/ia64/kernel/process.c       | 3 ++-
>  arch/m68k/kernel/process.c       | 2 +-
>  arch/microblaze/kernel/process.c | 2 +-
>  arch/mips/kernel/process.c       | 2 +-
>  arch/nds32/kernel/process.c      | 3 ++-
>  arch/nios2/kernel/process.c      | 2 +-
>  arch/openrisc/kernel/process.c   | 3 ++-
>  arch/parisc/kernel/process.c     | 3 ++-
>  arch/powerpc/kernel/process.c    | 2 +-
>  arch/riscv/kernel/process.c      | 2 +-
>  arch/s390/kernel/process.c       | 3 ++-
>  arch/sh/kernel/process_32.c      | 2 +-
>  arch/sparc/kernel/process_32.c   | 2 +-
>  arch/sparc/kernel/process_64.c   | 2 +-
>  arch/um/kernel/process.c         | 3 ++-
>  arch/x86/kernel/process.c        | 2 +-
>  arch/xtensa/kernel/process.c     | 2 +-
>  include/linux/sched/task.h       | 2 +-
>  kernel/fork.c                    | 3 ++-
>  26 files changed, 37 insertions(+), 26 deletions(-)
> 
> diff --git a/arch/alpha/kernel/process.c b/arch/alpha/kernel/process.c
> index a5123ea426ce..6005b0dfe7e2 100644
> --- a/arch/alpha/kernel/process.c
> +++ b/arch/alpha/kernel/process.c
> @@ -235,7 +235,7 @@ release_thread(struct task_struct *dead_task)
>   */
>  int copy_thread(unsigned long clone_flags, unsigned long usp,
>  		unsigned long kthread_arg, struct task_struct *p,
> -		unsigned long tls)
> +		unsigned long tls, u32 worker_flags)

After I unified all of those calls across all arches I think we should
start thinking about a way to maybe have a substruct
struct copy_thread
or something to encompass this information that gets passed to
copy_thread() instead of individual arguments.
struct copy_thread
would just contain the information all the arches need and nothing more.
That's better than passing all of
struct kernel_clone_args
imho. But that's a separate cleanup I had in mind for a while and is
unrelated to your patch.
I think it's fine to do it this way for now.

Acked-by: Christian Brauner <christian.brauner@...ntu.com>