Re: [PATCH] x86: Drop 32-bit support ... finally.

Borislav Petkov
2015-04-01T08:23:59Z

peterz says I forgot to Cc Linus. My bad. Fixed.

On Wed, Apr 01, 2015 at 10:15:58AM +0200, Borislav Petkov wrote:
> From: Borislav Petkov <bp@suse.de>
>
> Today, April 1st 2015, marks almost 15 years since the introduction of
> the 64-bit extensions to the x86 architecture. And frankly, 15 years was
> a graceful period enough for people to move to 64-bit. Therefore, today,
> I'm removing 32-bit support from x86 Linux. And it was about friggin'
> time...
>
> 32-bit code is old, full of nasty hacks and keeps always breaking when
> we do our shiny new features for 64-bit. And frankly, no one cares
> about 32-bit. If you do, then you're wrong and you need to get with the
> program. Go out, take a deep breath, go for a walk and the first thing
> you do when you come back is *take* *a* *look* at the goddam calendar.
> Time to say goodbye to your old 32-bit sand. Get a 64-bit processor.
> Live a little. Come to the real world.
>
> This is a minimal patch which prevents from building a 32-bit kernel
> only. Removing of the rest of the crazy ifdeffery and potential cleanups
> needs to come later, in nice clean patches. This is especially true for
> you, you patch count wankers. Restrain yourself!
>
> Signed-off-by: Borislav Petkov <bp@alien8.de>
> Cc: H. Peter Anvin <hpa@zytor.com>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Tony Luck <tony.luck@intel.com>
> Cc: Peter Zijlstra <peterz@infradead.org>
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Cc: Andy Lutomirski <luto@amacapital.net>
> Cc: Matt Fleming <matt@codeblueprint.co.uk>
> Cc: Jörg Rödel <joro@8bytes.org>
> Cc: Jiri Kosina <jkosina@suse.cz>
> Cc: Jeff Mahoney <jeffm@suse.com>
> Cc: Michal Hocko <mhocko@suse.cz>
> Cc: Vlastimil Babka <vbabka@suse.cz>
> Cc: Andre Przywara <andre@andrep.de>
> Cc: Andreas Herrmann <herrmann.der.user@gmail.com>
> Cc: Robert Richter <rric@kernel.org>
> Cc: Richard Weinberger <richard@nod.at>
> ---
> Makefile | 3 ---
> arch/x86/Kconfig | 9 ++-------
> 2 files changed, 2 insertions(+), 10 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index da36a3be7969..0a907dd934b6 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -256,9 +256,6 @@ UTS_MACHINE := $(ARCH)
> SRCARCH := $(ARCH)
>
> # Additional ARCH settings for x86
> -ifeq ($(ARCH),i386)
> - SRCARCH := x86
> -endif
> ifeq ($(ARCH),x86_64)
> SRCARCH := x86
> endif
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 8db84b0e5bbd..9fed79e3ed39 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1,13 +1,8 @@
> -# Select 32 or 64 bit
> config 64BIT
> - bool "64-bit kernel" if ARCH = "x86"
> - default ARCH != "i386"
> - ---help---
> - Say yes to build a 64-bit kernel - formerly known as x86_64
> - Say no to build a 32-bit kernel - formerly known as i386
> + def_bool y
>
> config X86_32
> - def_bool y
> + def_bool n
> depends on !64BIT
> select CLKSRC_I8253
> select HAVE_UID16
> --
> 2.3.3
>
>

--
Regards/Gruss,
Boris.

ECO tip #101: Trim your mails when you reply.
--