linux-kernel - Re: [PATCH] vt_buffer: drop console buffer copying optimisations

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Message-ID: <CAPj87rM7bSdBmvOha4bc9BHi7Pb_9NhCW6sRjPGq=e-jqug9yw@mail.gmail.com>
Date:	Mon, 9 Feb 2015 10:35:07 +0000
From:	Daniel Stone <daniel@...ishbar.org>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Tomi Valkeinen <tomi.valkeinen@...com>, dri-devel@...ts.sf.net,
	Dave Airlie <airlied@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] vt_buffer: drop console buffer copying optimisations

On 5 February 2015 at 11:35, One Thousand Gnomes
<gnomes@...rguk.ukuu.org.uk> wrote:
>> If I'm not mistaken, that would be as simple as adding
>>
>>     #define VT_BUF_HAVE_RW.
>>     #define scr_writew(val, addr) (*(addr) = (val))
>>     #define scr_readw(addr) (*(addr))
>>
>> to arch/x86/include/asm/vga.h.
>
> and stick an
>
> #if defined (CONFIG_SUPPORT_SHITE_VGA_ADAPTERS)
>
> #endif
>
> around that and its sorted as an option everyone can leave off but the
> afflicted.

Well, given all the distros will enable that, might as well be #if
!defined(CONFIG_BREAK_SOME_HARDWARE_BUT_VGA_SCROLLING_WILL_BE_IMMEASURABLY_FASTER).
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