linux-kernel - Re: [PATCH] tty: Don't force RISCV SBI console as preferred console

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Date:   Tue, 30 Apr 2019 17:25:03 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...ive.com>
To:     Anup Patel <Anup.Patel@....com>
CC:     Greg KH <gregkh@...uxfoundation.org>, jslaby@...e.com,
        aou@...s.berkeley.edu, Atish Patra <Atish.Patra@....com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anup Patel <Anup.Patel@....com>, stable@...r.kernel.org
Subject:     Re: [PATCH] tty: Don't force RISCV SBI console as preferred console

On Thu, 25 Apr 2019 06:35:06 PDT (-0700), Anup Patel wrote:
> The Linux kernel will auto-disables all boot consoles whenever it
> gets a preferred real console.
> 
> Currently on RISC-V systems, if we have a real console which is not
> RISCV SBI console then boot consoles (such as earlycon=sbi) are not
> auto-disabled when a real console (ttyS0 or ttySIF0) is available.
> This results in duplicate prints at boot-time after kernel starts
> using real console (i.e. ttyS0 or ttySIF0) if "earlycon=" kernel
> parameter was passed by bootloader.
> 
> The reason for above issue is that RISCV SBI console always adds
> itself as preferred console which is causing other real consoles
> to be not used as preferred console.
> 
> Ideally "console=" kernel parameter passed by bootloaders should
> be the one selecting a preferred real console.
> 
> This patch fixes above issue by not forcing RISCV SBI console as
> preferred console.
> 
> Fixes: afa6b1ccfad5 ("tty: New RISC-V SBI console driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Anup Patel <anup.patel@....com>
> ---
>  drivers/tty/hvc/hvc_riscv_sbi.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/tty/hvc/hvc_riscv_sbi.c b/drivers/tty/hvc/hvc_riscv_sbi.c
> index 75155bde2b88..31f53fa77e4a 100644
> --- a/drivers/tty/hvc/hvc_riscv_sbi.c
> +++ b/drivers/tty/hvc/hvc_riscv_sbi.c
> @@ -53,7 +53,6 @@ device_initcall(hvc_sbi_init);
>  static int __init hvc_sbi_console_init(void)
>  {
>  	hvc_instantiate(0, 0, &hvc_sbi_ops);
> -	add_preferred_console("hvc", 0, NULL);
>  
>  	return 0;
>  }
> -- 
> 2.17.1
> 

I merged this.  Also, it looks like Exchange is doing something to your patches
that makes them a bit difficult to merge.  If you don't have a way of fixing
that, can you include a pointer to a git tree with a signed commit/tag?