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From: Borislav Petkov <bp@alien8.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org, linux-kernel@vger.kernel.org,
	jpoimboe@redhat.com, mark.rutland@arm.com, dvyukov@google.com,
	seanjc@google.com, pbonzini@redhat.com, mbenes@suse.cz
Subject: Re: [RFC][PATCH 02/22] x86,mmx_32: Remove .fixup usage
Date: Thu, 4 Nov 2021 19:00:43 +0100	[thread overview]
Message-ID: <YYQfy2CNYyXO4KLV@zn.tnic> (raw)
In-Reply-To: <20211104165524.625383149@infradead.org>

On Thu, Nov 04, 2021 at 05:47:31PM +0100, Peter Zijlstra wrote:
> This code puts an exception table entry on the "PREFIX" instruction to
> overwrite it with a jmp.d8 when it triggers an exception. Except of
> course, our code is no longer writable, also SMP.
> 
> Replace it with ALTERNATIVE, the novel
> 
> XXX: arguably we should just delete this code

Yah, might as well.

Wikipedia says the last AMD CPU which supports 3DNow is A8-3870K which
is family 0x11, i.e.,

1. a real rarity
2. it is pretty much obsolete
3. even if not, it can do AMD64
4. and even if people who have it, wanna run 32-bit, they can use the
normal memcpy, i.e., CONFIG_X86_USE_3DNOW=n should work there

In our case, it is a bit different, though:

config X86_USE_3DNOW
        def_bool y
        depends on (MCYRIXIII || MK7 || MGEODE_LX) && !UML

MK7 is K7 - that is practically dead.

The only thing I have no clue about are those cyrix and geode things and
whether they're still actively used in some embedded gunk.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2021-11-04 18:00 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-04 16:47 [RFC][PATCH 00/22] x86: Remove anonymous out-of-line fixups Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 01/22] bitfield.h: Fix "type of reg too small for mask" test Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 02/22] x86,mmx_32: Remove .fixup usage Peter Zijlstra
2021-11-04 18:00   ` Borislav Petkov [this message]
2021-11-05 11:20     ` David Laight
2021-11-04 20:22   ` Josh Poimboeuf
2021-11-05  8:05     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 03/22] x86,copy_user_64: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 04/22] x86,copy_mc_64: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 05/22] x86,entry_64: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 06/22] x86,entry_32: " Peter Zijlstra
2021-11-04 20:39   ` Josh Poimboeuf
2021-11-05  7:43     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 07/22] x86,extable: Extend extable functionality Peter Zijlstra
2021-11-04 21:49   ` Josh Poimboeuf
2021-11-05  7:54     ` Peter Zijlstra
2021-11-05 10:16       ` Mark Rutland
2021-11-05 17:32   ` Sean Christopherson
2021-11-05 18:45     ` Peter Zijlstra
2021-11-05 19:17       ` Sean Christopherson
2021-11-05 19:32         ` Peter Zijlstra
2021-11-05 19:47           ` Sean Christopherson
2021-11-05 20:15             ` Peter Zijlstra
2021-11-05 20:26               ` Peter Zijlstra
2021-11-05 22:30                 ` Sean Christopherson
2021-11-04 16:47 ` [RFC][PATCH 08/22] x86,msr: Remove .fixup usage Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 09/22] x86,futex: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 10/22] x86,uaccess: " Peter Zijlstra
2021-11-04 22:28   ` Josh Poimboeuf
2021-11-04 16:47 ` [RFC][PATCH 11/22] x86,xen: " Peter Zijlstra
2021-11-04 22:31   ` Josh Poimboeuf
2021-11-05  7:56     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 12/22] x86,fpu: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 13/22] x86,segment: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 14/22] x86,ftrace: " Peter Zijlstra
2021-11-04 22:35   ` Josh Poimboeuf
2021-11-05  7:57     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 15/22] x86,vmx: " Peter Zijlstra
2021-11-04 18:50   ` Paolo Bonzini
2021-11-05 18:17   ` Sean Christopherson
2021-11-05 18:52     ` Peter Zijlstra
2021-11-05 20:58     ` Peter Zijlstra
2021-11-05 22:29       ` Sean Christopherson
2021-11-06  7:05     ` Paolo Bonzini
2021-11-06  8:36       ` Peter Zijlstra
2021-11-07 19:13         ` Paolo Bonzini
2021-11-06  8:28     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 16/22] x86,checksum_32: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 17/22] x86,sgx: " Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 18/22] x86,kvm: " Peter Zijlstra
2021-11-04 18:50   ` Paolo Bonzini
2021-11-05  7:58     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 19/22] x86,usercopy_32: Simplify Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 20/22] x86,usercopy: Remove .fixup usage Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 21/22] x86,word-at-a-time: " Peter Zijlstra
2021-11-04 23:33   ` Josh Poimboeuf
2021-11-05  8:04     ` Peter Zijlstra
2021-11-04 16:47 ` [RFC][PATCH 22/22] x86: Remove .fixup section Peter Zijlstra
2021-11-04 23:00   ` Josh Poimboeuf

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