From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>,
Michal Marek <mmarek@suse.cz>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andi Kleen <andi@firstfloor.org>,
live-patching@vger.kernel.org, X86 ML <x86@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v5 02/10] x86: Compile-time asm code validation
Date: Thu, 11 Jun 2015 09:01:10 -0500 [thread overview]
Message-ID: <20150611140110.GB11517@treble.redhat.com> (raw)
In-Reply-To: <20150611060807.GA30720@gmail.com>
On Thu, Jun 11, 2015 at 08:08:07AM +0200, Ingo Molnar wrote:
>
> * Josh Poimboeuf <jpoimboe@redhat.com> wrote:
>
> > I should also mention that my proposed ia32_ptregs_common patch, which
> > duplicated the needed code, was more optimized for performance than code size.
> >
> > But if you're more worried about code size, we could turn ia32_ptregs_common
> > into a proper callable function, and then replace
> >
> > jmp ia32_ptregs_common
> >
> > with:
> >
> > call ia32_ptregs_common
> > ret
> >
> > So it becomes a regular call instead of a tail call. It only adds a few
> > instructions and the function is self-contained. Would that be good enough?
>
> No, debug info should not slow down the kernel, especially not code we write in
> assembly partly for performance.
Ok. I'll work on adding support for external jumps.
--
Josh
next prev parent reply other threads:[~2015-06-11 14:01 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 12:06 [PATCH v5 00/10] x86/asm: Compile-time asm code validation Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 01/10] x86/asm: Add FP_SAVE/RESTORE frame pointer macros Josh Poimboeuf
2015-06-10 18:17 ` Pavel Machek
2015-06-10 18:24 ` Josh Poimboeuf
2015-06-11 4:22 ` Jiri Kosina
2015-06-11 6:46 ` Pavel Machek
2015-06-11 12:06 ` Jiri Kosina
2015-06-11 14:18 ` Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 02/10] x86: Compile-time asm code validation Josh Poimboeuf
2015-06-10 17:21 ` Andy Lutomirski
2015-06-10 17:53 ` Josh Poimboeuf
2015-06-10 18:15 ` Andy Lutomirski
2015-06-10 18:58 ` Josh Poimboeuf
2015-06-10 22:17 ` Josh Poimboeuf
2015-06-11 6:08 ` Ingo Molnar
2015-06-11 14:01 ` Josh Poimboeuf [this message]
2015-06-11 6:10 ` Ingo Molnar
2015-06-11 14:10 ` Josh Poimboeuf
2015-06-12 11:18 ` Pedro Alves
2015-06-12 14:10 ` Josh Poimboeuf
2015-06-12 16:00 ` Pedro Alves
2015-06-12 16:41 ` Josh Poimboeuf
2015-06-10 18:16 ` Vojtech Pavlik
2015-06-10 18:18 ` Andy Lutomirski
2015-06-10 12:06 ` [PATCH v5 03/10] x86/asm/entry: Fix asmvalidate warnings for entry_64_compat.S Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 04/10] x86/asm/crypto: Fix asmvalidate warnings for aesni-intel_asm.S Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 05/10] x86/asm/crypto: Fix asmvalidate warnings for ghash-clmulni-intel_asm.S Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 06/10] x86/asm/efi: Fix asmvalidate warnings for efi_stub_64.S Josh Poimboeuf
2015-06-11 13:14 ` Matt Fleming
2015-06-12 19:24 ` Borislav Petkov
2015-06-10 12:06 ` [PATCH v5 07/10] x86/asm/acpi: Fix asmvalidate warnings for wakeup_64.S Josh Poimboeuf
2015-06-10 13:19 ` Pavel Machek
2015-06-10 14:08 ` Josh Poimboeuf
2015-06-11 12:36 ` Pavel Machek
2015-06-10 13:21 ` Pavel Machek
2015-06-10 14:13 ` Josh Poimboeuf
2015-06-11 6:13 ` Ingo Molnar
2015-06-10 12:06 ` [PATCH v5 08/10] x86/asm/head: Fix asmvalidate warnings for head_64.S Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 09/10] x86/asm/lib: Fix asmvalidate warnings for lib functions Josh Poimboeuf
2015-06-10 12:06 ` [PATCH v5 10/10] x86/asm/lib: Fix asmvalidate warnings for rwsem.S Josh Poimboeuf
2015-06-10 12:16 ` [PATCH v5 00/10] x86/asm: Compile-time asm code validation Josh Poimboeuf
2015-06-10 13:08 ` Andi Kleen
2015-06-10 13:52 ` Josh Poimboeuf
2015-06-10 14:11 ` Andi Kleen
2015-06-10 14:32 ` Josh Poimboeuf
2015-06-10 15:04 ` Andi Kleen
2015-06-10 15:31 ` Josh Poimboeuf
2015-06-10 16:50 ` Josh Poimboeuf
2015-06-10 18:41 ` Andi Kleen
2015-06-10 19:43 ` Josh Poimboeuf
2015-06-10 18:40 ` Andi Kleen
2015-06-10 19:36 ` Josh Poimboeuf
2015-06-10 19:38 ` Andy Lutomirski
2015-06-10 19:51 ` Josh Poimboeuf
2015-06-10 13:42 ` Pavel Machek
2015-06-10 14:20 ` Josh Poimboeuf
2015-06-10 18:24 ` Andy Lutomirski
2015-06-10 20:26 ` Josh Poimboeuf
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