linux-kernel - Re: [PATCH 00/16] x86/asm changes for 4.1 for review

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Date:	Wed, 4 Mar 2015 22:50:15 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Borislav Petkov <bp@...en8.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH 00/16] x86/asm changes for 4.1 for review


* Andy Lutomirski <luto@...capital.net> wrote:

> Hi all-
> 
> After much handwringing, painful review, and curation, here's round 
> 1 of the x86/asm changes.  (This is not intended to imply that there 
> will or will not be a round 2.)
> 
> For ease of review for git users:
> 
> The following changes since commit 7453311d68f16a5c587c3cbf19563c9a4fbbd41a:
> 
>   Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip (2015-02-09 17:16:44 -0800)
> 
> are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git 
> 
> for you to fetch changes up to 4710be56d76ef994ddf59087aad98c000fbab9a4:
> 
>   x86_64, entry: Remove a bogus ret_from_fork optimization (2015-02-26 07:09:36 -0800)
> 
> Ingo, if you like these, feel free to pull.  I will try to review 
> the scary change *again* this evening if I have time.  In the mean 
> time, these are queued as is for -next.  I will remove them from my 
> -next branch if they turn out to be buggy or if they end up in -tip 
> in any form.
> 
> Andy Lutomirski (2):
>   x86, entry: Remove int_check_syscall_exit_work
>   x86_64, entry: Remove a bogus ret_from_fork optimization
> 
> Denys Vlasenko (14):
>   x86: open-code register save/restore in trace_hardirqs thunks
>   x86: introduce push/pop macros which generate CFI_REL_OFFSET and
>     CFI_RESTORE
>   x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET
>   x86: entry_64.S: always allocate complete "struct pt_regs"
>   x86: entry_64.S: fix comments. No code changes
>   x86: code shrink in paranoid_exit
>   x86: mass removal of ARGOFFSET. No code changes
>   x86: add comments about various syscall instructions, no code changes
>   x86: entry_64.S: move save_paranoid and ret_from_fork closer to their
>     users
>   x86: entry_64.S: rename save_paranoid to paranoid_entry, no code
>     changes
>   x86: ia32entry.S: fold IA32_ARG_FIXUP macro into its callers
>   x86: entry_64.S: use more understandable constants
>   x86: ia32entry.S: use more understandable constant
>   x86: entry.S: simplify optimistic SYSRET
> 
>  arch/x86/ia32/ia32entry.S              | 342 ++++++++++++----------
>  arch/x86/include/asm/calling.h         | 267 ++++++++---------
>  arch/x86/include/asm/dwarf2.h          |  24 ++
>  arch/x86/include/asm/irqflags.h        |   4 +-
>  arch/x86/include/asm/ptrace.h          |  13 +-
>  arch/x86/include/uapi/asm/ptrace-abi.h |  16 +-
>  arch/x86/include/uapi/asm/ptrace.h     |  13 +-
>  arch/x86/kernel/entry_32.S             |  21 +-
>  arch/x86/kernel/entry_64.S             | 510 ++++++++++++++++-----------------
>  arch/x86/lib/atomic64_cx8_32.S         |  50 ++--
>  arch/x86/lib/checksum_32.S             |  60 ++--
>  arch/x86/lib/msr-reg.S                 |  24 +-
>  arch/x86/lib/rwsem.S                   |  44 ++-
>  arch/x86/lib/thunk_32.S                |  18 +-
>  arch/x86/lib/thunk_64.S                |  28 +-
>  15 files changed, 724 insertions(+), 710 deletions(-)

Ok, I had a really close look, and these changes are all looking good 
to me.

While reviewing the patches I also fixed up the patch titles and tons 
of small details in the changelogs, so I didn't pull but applied the 
patches out of email, to tip:x86/asm.

Thanks guys, this is really good progress and a big step forward for 
the x86 entry code's readability and maintainability!

Thanks,

	Ingo
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