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Message-ID: <CAJZ5v0jBFOWZZrGuBb0GyJa3rKRwSYXrMFOtGu8jLnQ+OPtXHw@mail.gmail.com>
Date:   Tue, 22 Mar 2022 18:41:20 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        linux-s390@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-ia64@...r.kernel.org,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Pavel Machek <pavel@....cz>, Len Brown <lenb@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] Docs: admin/kernel-parameters: edit a few boot options

On Mon, Mar 21, 2022 at 2:22 AM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> Clean up some of admin-guide/kernel-parameters.txt:
>
> a. "smt" should be "smt=" (S390)
> b. add "smt-enabled" for POWERPC
> c. Sparc supports the vdso= boot option
> d. make the tp_printk options (2) formatting similar to other options
>    by adding spacing
> e. add "trace_clock=" with a reference to Documentation/trace/ftrace.rst
> f. use [IA-64] as documented instead of [ia64]
> g. fix formatting and text for test_suspend=

This ->

> h. fix formatting for swapaccount=
> i. fix formatting and grammar for video.brightness_switch_enabled=

-> and the last one are fine with me, but I suppose that there will be a v2?

> Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
> Cc: Heiko Carstens <hca@...ux.ibm.com>
> Cc: Vasily Gorbik <gor@...ux.ibm.com>
> Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
> Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
> Cc: Sven Schnelle <svens@...ux.ibm.com>
> Cc: linux-s390@...r.kernel.org
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: sparclinux@...r.kernel.org
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-ia64@...r.kernel.org
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Pavel Machek <pavel@....cz>
> Cc: Len Brown <lenb@...nel.org>
> Cc: linux-pm@...r.kernel.org
> Cc: linux-acpi@...r.kernel.org
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: linux-doc@...r.kernel.org
> ---
>  Documentation/admin-guide/kernel-parameters.txt |   33 +++++++++-----
>  1 file changed, 22 insertions(+), 11 deletions(-)
>
> --- linux-next-20220318.orig/Documentation/admin-guide/kernel-parameters.txt
> +++ linux-next-20220318/Documentation/admin-guide/kernel-parameters.txt
> @@ -2814,7 +2814,7 @@
>                         different yeeloong laptops.
>                         Example: machtype=lemote-yeeloong-2f-7inch
>
> -       max_addr=nn[KMG]        [KNL,BOOT,ia64] All physical memory greater
> +       max_addr=nn[KMG]        [KNL,BOOT,IA-64] All physical memory greater
>                         than or equal to this physical address is ignored.
>
>         maxcpus=        [SMP] Maximum number of processors that an SMP kernel
> @@ -3057,7 +3057,7 @@
>
>         mga=            [HW,DRM]
>
> -       min_addr=nn[KMG]        [KNL,BOOT,ia64] All physical memory below this
> +       min_addr=nn[KMG]        [KNL,BOOT,IA-64] All physical memory below this
>                         physical address is ignored.
>
>         mini2440=       [ARM,HW,KNL]
> @@ -5382,13 +5382,19 @@
>                                 1: Fast pin select (default)
>                                 2: ATC IRMode
>
> -       smt             [KNL,S390] Set the maximum number of threads (logical
> +       smt=            [KNL,S390] Set the maximum number of threads (logical
>                         CPUs) to use per physical CPU on systems capable of
>                         symmetric multithreading (SMT). Will be capped to the
>                         actual hardware limit.
>                         Format: <integer>
>                         Default: -1 (no limit)
>
> +       smt-enabled=    [PPC 64-bit] Enable SMT, disable SMT, or set the
> +                       maximum number of threads. This can be used to override
> +                       the Open Firmware (OF) option.
> +                       Format: on | off | <integer>
> +                       Default: all threads enabled
> +
>         softlockup_panic=
>                         [KNL] Should the soft-lockup detector generate panics.
>                         Format: 0 | 1
> @@ -5768,8 +5774,9 @@
>                         This parameter controls use of the Protected
>                         Execution Facility on pSeries.
>
> -       swapaccount=[0|1]
> -                       [KNL] Enable accounting of swap in memory resource
> +       swapaccount=    [KNL]
> +                       Format: [0|1]
> +                       Enable accounting of swap in memory resource
>                         controller if no parameter or 1 is given or disable
>                         it if 0 is given (See Documentation/admin-guide/cgroup-v1/memory.rst)
>
> @@ -5815,7 +5822,8 @@
>
>         tdfx=           [HW,DRM]
>
> -       test_suspend=   [SUSPEND][,N]
> +       test_suspend=   [SUSPEND]
> +                       Format: { "mem" | "standby" | "freeze" }[,N]
>                         Specify "mem" (for Suspend-to-RAM) or "standby" (for
>                         standby suspend) or "freeze" (for suspend type freeze)
>                         as the system sleep state during system startup with
> @@ -5902,6 +5910,8 @@
>         trace_buf_size=nn[KMG]
>                         [FTRACE] will set tracing buffer size on each cpu.
>
> +       trace_clock=    [FTRACE] See Documentation/trace/ftrace.rst
> +
>         trace_event=[event-list]
>                         [FTRACE] Set and start specified trace events in order
>                         to facilitate early boot debugging. The event-list is a
> @@ -5924,7 +5934,7 @@
>                         See also Documentation/trace/ftrace.rst "trace options"
>                         section.
>
> -       tp_printk[FTRACE]
> +       tp_printk       [FTRACE]
>                         Have the tracepoints sent to printk as well as the
>                         tracing ring buffer. This is useful for early boot up
>                         where the system hangs or reboots and does not give the
> @@ -5946,7 +5956,7 @@
>                         frequency tracepoints such as irq or sched, can cause
>                         the system to live lock.
>
> -       tp_printk_stop_on_boot[FTRACE]
> +       tp_printk_stop_on_boot [FTRACE]
>                         When tp_printk (above) is set, it can cause a lot of noise
>                         on the console. It may be useful to only include the
>                         printing of events during boot up, as user space may
> @@ -6295,7 +6305,7 @@
>                                         HIGHMEM regardless of setting
>                                         of CONFIG_HIGHPTE.
>
> -       vdso=           [X86,SH]
> +       vdso=           [X86,SH,SPARC]
>                         On X86_32, this is an alias for vdso32=.  Otherwise:
>
>                         vdso=1: enable VDSO (the default)
> @@ -6321,11 +6331,12 @@
>         video=          [FB] Frame buffer configuration
>                         See Documentation/fb/modedb.rst.
>
> -       video.brightness_switch_enabled= [0,1]
> +       video.brightness_switch_enabled= [ACPI]
> +                       Format: [0|1]
>                         If set to 1, on receiving an ACPI notify event
>                         generated by hotkey, video driver will adjust brightness
>                         level and then send out the event to user space through
> -                       the allocated input device; If set to 0, video driver
> +                       the allocated input device. If set to 0, video driver
>                         will only send out the event without touching backlight
>                         brightness level.
>                         default: 1

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