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

From: Ingo Molnar
Date: Thu Jun 18 2015 - 12:49:40 EST

* H. Peter Anvin <hpa@xxxxxxxxx> 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@xxxxxxxxxx>
> > AuthorDate: Mon, 8 Jun 2015 21:20:26 +0200
> > Committer: Ingo Molnar <mingo@xxxxxxxxxx>
> > 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

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.


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