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From: Al Viro <viro@zeniv.linux.org.uk>
To: Rob Landley <rob@landley.net>
Cc: Randy Dunlap <rdunlap@infradead.org>, linux-kernel@vger.kernel.org
Subject: Re: Why is CONFIG_VT forced on?
Date: Tue, 31 Dec 2019 02:40:54 +0000	[thread overview]
Message-ID: <20191231024054.GC4203@ZenIV.linux.org.uk> (raw)
In-Reply-To: <774dfe49-61a0-0144-42b7-c2cbac150687@landley.net>

On Mon, Dec 30, 2019 at 08:04:35PM -0600, Rob Landley wrote:
> 
> 
> On 12/30/19 7:45 PM, Rob Landley wrote:
> > On 12/30/19 6:59 PM, Randy Dunlap wrote:
> >> #
> >> # Character devices
> >> #
> >> CONFIG_TTY=y
> >> # CONFIG_VT is not set
> >>
> >> But first you must set/enable EXPERT.  See the bool prompt.
> > 
> > Wait, the if doesn't _disable_ the symbol? It disables _editability_ of the
> > symbol, but the symbol can still be on (and displayed) when the if is false?
> > (Why would...)
> > 
> > Ok. Thanks for pointing that out. Any idea why the menuconfig help text has no
> > mention of this?
> 
> So if I disable CONFIG_EXPERT, using miniconfig I then need to manually switch on:
> 
> ./init/Kconfig:	bool "Namespaces support" if EXPERT
> ./init/Kconfig:	bool "Multiple users, groups and capabilities support" if EXPERT
> ./init/Kconfig:	bool "Sysfs syscall support" if EXPERT
> ./init/Kconfig:	bool "open by fhandle syscalls" if EXPERT
> ./init/Kconfig:	bool "Posix Clocks & timers" if EXPERT
> ./init/Kconfig:	bool "Enable support for printk" if EXPERT
> ./init/Kconfig:	bool "BUG() support" if EXPERT
> ./init/Kconfig:	bool "Enable ELF core dumps" if EXPERT
> ./init/Kconfig:	bool "Enable full-sized data structures for core" if EXPERT
> ./init/Kconfig:	bool "Enable futex support" if EXPERT
> ./init/Kconfig:	bool "Enable eventpoll support" if EXPERT
> ./init/Kconfig:	bool "Enable signalfd() system call" if EXPERT
> ./init/Kconfig:	bool "Enable timerfd() system call" if EXPERT
> ./init/Kconfig:	bool "Enable eventfd() system call" if EXPERT
> ./init/Kconfig:	bool "Use full shmem filesystem" if EXPERT
> ./init/Kconfig:	bool "Enable AIO support" if EXPERT
> ./init/Kconfig:	bool "Enable IO uring support" if EXPERT
> ./init/Kconfig:	bool "Enable madvise/fadvise syscalls" if EXPERT
> ./init/Kconfig:	bool "Enable membarrier() system call" if EXPERT
> ./init/Kconfig:	bool "Load all symbols for debugging/ksymoops" if EXPERT
> ./init/Kconfig:	bool "Enable rseq() system call" if EXPERT
> ./init/Kconfig:	bool "Enabled debugging of rseq() system call" if EXPERT
> ./init/Kconfig:	bool "PC/104 support" if EXPERT
> ./init/Kconfig:	bool "Enable VM event counters for /proc/vmstat" if EXPERT

No.  What you need is
	* actually attempt to flip CONFIG_EXPERT (go to "General setup" submenu and
set "Configure standard kernel features (expert users)" there)
	* check the resulting .config (or look at the items in question via
menuconfig)
	* get enlightened

Rob, if you are in a mood for a long wank, it's your business.  But try to avoid
spraying the results over public lists.

  parent reply	other threads:[~2019-12-31  2:40 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-31  0:30 Why is CONFIG_VT forced on? Rob Landley
2019-12-31  0:36 ` Randy Dunlap
2019-12-31  0:53   ` Rob Landley
2019-12-31  0:59     ` Randy Dunlap
2019-12-31  1:45       ` Rob Landley
2019-12-31  2:00         ` Randy Dunlap
2019-12-31  2:04         ` Rob Landley
2019-12-31  2:03           ` Randy Dunlap
2019-12-31  2:33             ` Theodore Y. Ts'o
2019-12-31  2:40           ` Al Viro [this message]
2019-12-31  2:52             ` Al Viro
2019-12-31  3:27               ` Rob Landley
2019-12-31  3:53                 ` Al Viro
2019-12-31  4:18                   ` Al Viro
2019-12-31  5:58                     ` Al Viro
2020-01-01 20:41                       ` [PATCH] menuconfig: restore prompt dependencies in help text Arvind Sankar
2020-01-01 21:04                         ` Al Viro
2020-01-01 22:26                           ` Arvind Sankar
2020-01-02 16:14                             ` Randy Dunlap
2020-01-02 23:14                               ` [PATCH] kconfig: " Arvind Sankar
2020-01-03  2:10                                 ` Masahiro Yamada
2020-01-03  4:20                                   ` Arvind Sankar
2019-12-31  1:55 ` Why is CONFIG_VT forced on? Theodore Y. Ts'o
2020-01-04 20:27   ` Enrico Weigelt, metux IT consult
2019-12-31  2:28 ` Al Viro

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