linux-kernel - [RFC] Rename various 'IA32' uses in arch/x86/ code

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Message-ID: <20150618164912.GA8557@gmail.com>
Date:	Thu, 18 Jun 2015 18:49:12 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	brgerst@...il.com, linux-kernel@...r.kernel.org,
	peterz@...radead.org, bp@...en8.de, tglx@...utronix.de,
	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	dvlasenk@...hat.com, luto@...capital.net,
	linux-tip-commits@...r.kernel.org
Subject: [RFC] Rename various 'IA32' uses in arch/x86/ code


* H. Peter Anvin <hpa@...or.com> wrote:

> On 06/08/2015 03:24 PM, tip-bot for Ingo Molnar wrote:
> > Commit-ID:  bace7117d3fb59a6ed7ea1aa6c8994df6a28a72a
> > Gitweb:     http://git.kernel.org/tip/bace7117d3fb59a6ed7ea1aa6c8994df6a28a72a
> > Author:     Ingo Molnar <mingo@...nel.org>
> > AuthorDate: Mon, 8 Jun 2015 21:20:26 +0200
> > Committer:  Ingo Molnar <mingo@...nel.org>
> > CommitDate: Mon, 8 Jun 2015 23:43:38 +0200
> > 
> > x86/asm/entry: (Re-)rename __NR_entry_INT80_compat_max to __NR_syscall_compat_max
> > 
> > Brian Gerst noticed that I did a weird rename in the following commit:
> > 
> >    b2502b418e63 ("x86/asm/entry: Untangle 'system_call' into two entry points: entry_SYSCALL_64 and entry_INT80_32")
> > 
> > which renamed __NR_ia32_syscall_max to __NR_entry_INT80_compat_max.
> > 
> > Now the original name was a misnomer, but the new one is a misnomer as well,
> > as all the 32-bit compat syscall entry points (sysenter, syscall) share the
> > system call table, not just the INT80 based one.
> > 
> > Rename it to __NR_syscall_compat_max.
> > 
> 
> The original one wasn't really a misnomer, as it referred to the ia32
> system calls specifically, but this works too.

It was a misnomer, because what are the 'ia32 system calls'? We have no Intel 
specific system calls!

The term 'IA32' (Intel Architecture 32-bit) is a misnomer in many existing 
arch/x86/ symbol, function and file names, and most of them should be renamed.

Some common examples, with a suggested rename target:

 stack_frame_ia32		-> stack_frame_compat
 IA32_RT_SIGFRAME_sigcontext	-> COMPAT_RT_SIGFRAME_sigcontext
 sigcontext_ia32		-> sigcontext_compat
 user_i387_ia32_struct		-> user_i387_compat_struct
 TIF_IA32			-> TIF_COMPAT

and here a few 'ia32' misnomers that should be addressed not via simple renames, 
but via transformations to existing compat facilities:

 CONFIG_IA32_EMULATION		-> partly eliminate, partly covert to CONFIG_COMPAT use
 is_ia32_task()			-> convert to is_compat_task() use

This holds for file names as well, for example:

 arch/x86/ia32/			-> arch/x86/compat/
 arch/x86/ia32/ia32_aout.c	-> arch/x86/compat/aout.c
 arch/x86/ia32/ia32_signal.c	-> arch/x86/compat/signal.c
 arch/x86/ia32/sys_ia32.c	-> arch/x86/compat/sys.c

There are a number of symbols where the 'IA32' name is probably fine: for example 
the various Intel-specific MSR names - or even cross-CPU MSR names that AMD uses 
but which got first introduced on Intel CPUs.

For generic names that deal with 32-bit compat, 'ia32' is a misnomer.

If there's consensus for the above (re-)naming schemes I can start doing them.

Thanks,

	Ingo
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