From: Borislav Petkov <bp@alien8.de>
To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Denys Vlasenko <dvlasenk@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Oleg Nesterov <oleg@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@amacapital.net>,
Frederic Weisbecker <fweisbec@gmail.com>, X86 ML <x86@kernel.org>,
Alexei Starovoitov <ast@plumgrid.com>,
Will Drewry <wad@chromium.org>, Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH 3/4] x86: open-code register save/restore in trace_hardirqs thunks
Date: Sun, 11 Jan 2015 11:54:36 +0100 [thread overview]
Message-ID: <20150111105436.GA19421@pd.tnic> (raw)
In-Reply-To: <CAK1hOcMU0kV1M8dk-iOnTJuY3xtE+tmqqgzTxXnzzuDR2EOuLg@mail.gmail.com>
On Sun, Jan 11, 2015 at 04:33:58AM +0100, Denys Vlasenko wrote:
> I understand Andy's post.
> My question is, what about places like this?
>
> > .macro op_safe_regs op
> > ENTRY(\op\()_safe_regs)
> > CFI_STARTPROC
> > pushl_cfi %ebx
> > pushl_cfi %ebp
> > pushl_cfi %esi
> > pushl_cfi %edi
>
> Do we need to convert it to use macros which also do
> "CFI_REL_OFFSET reg, 0" thingy, or not?
> In either case: why?
What is different at those places to not use the CFI annotations?
Frankly speaking, I'm for dropping all that CFI ugliness completely.
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
next prev parent reply other threads:[~2015-01-11 10:54 UTC|newest]
Thread overview: 150+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-01-10 22:00 [PATCH 0/4 v2] x86: entry.S cleanup Denys Vlasenko
2015-01-10 22:00 ` [PATCH 1/4] x86: entry_64.S: delete unused code Denys Vlasenko
2015-01-10 22:12 ` Andy Lutomirski
2015-01-10 22:00 ` [PATCH 2/4] x86: ia32entry.S: fix wrong symbolic constant usage: R11->ARGOFFSET Denys Vlasenko
2015-01-10 22:13 ` Andy Lutomirski
2015-01-10 22:27 ` Linus Torvalds
2015-01-10 22:35 ` Borislav Petkov
2015-01-10 22:41 ` Linus Torvalds
2015-01-10 22:45 ` Borislav Petkov
2015-01-10 22:37 ` Linus Torvalds
2015-01-10 23:27 ` Andy Lutomirski
2015-01-13 22:11 ` Andy Lutomirski
2015-01-10 22:00 ` [PATCH 3/4] x86: open-code register save/restore in trace_hardirqs thunks Denys Vlasenko
2015-01-10 22:07 ` Linus Torvalds
2015-01-10 22:35 ` Denys Vlasenko
2015-01-10 22:41 ` Borislav Petkov
2015-01-11 3:33 ` Denys Vlasenko
2015-01-11 10:54 ` Borislav Petkov [this message]
2015-01-11 23:06 ` Denys Vlasenko
2015-02-11 2:38 ` Andy Lutomirski
2015-01-10 22:00 ` [PATCH 4/4] x86: entry_64.S: fold SAVE_ARGS_IRQ macro into its sole user Denys Vlasenko
2015-01-13 22:26 ` Andy Lutomirski
-- strict thread matches above, loose matches on Subject: below --
2015-02-26 22:40 [PATCH 00/16] x86/asm changes for 4.1 for review Andy Lutomirski
2015-02-26 22:40 ` [PATCH 01/16] x86: open-code register save/restore in trace_hardirqs thunks Andy Lutomirski
2015-03-04 22:52 ` [tip:x86/asm] x86/asm/64: Open-code register save/ restore in trace_hardirqs*() thunks tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 02/16] x86: introduce push/pop macros which generate CFI_REL_OFFSET and CFI_RESTORE Andy Lutomirski
2015-03-04 22:52 ` [tip:x86/asm] x86/asm: Introduce push/ pop " tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 03/16] x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET Andy Lutomirski
2015-03-04 22:53 ` [tip:x86/asm] x86/asm/entry/64: Fix incorrect " tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 04/16] x86: entry_64.S: always allocate complete "struct pt_regs" Andy Lutomirski
2015-03-04 22:53 ` [tip:x86/asm] x86/asm/entry/64: Always allocate a complete " struct pt_regs" on the kernel stack tip-bot for Denys Vlasenko
2015-03-21 22:51 ` Brian Gerst
2015-03-22 14:15 ` Denys Vlasenko
2015-02-26 22:40 ` [PATCH 05/16] x86: entry_64.S: fix comments. No code changes Andy Lutomirski
2015-03-04 22:53 ` [tip:x86/asm] x86/asm/entry/64: Fix comments tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 06/16] x86: code shrink in paranoid_exit Andy Lutomirski
2015-03-04 22:53 ` [tip:x86/asm] x86/asm/entry/64: Shrink code in 'paranoid_exit' tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 07/16] x86: mass removal of ARGOFFSET. No code changes Andy Lutomirski
2015-03-04 22:54 ` [tip:x86/asm] x86/asm/entry: Do mass removal of 'ARGOFFSET' tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 08/16] x86, entry: Remove int_check_syscall_exit_work Andy Lutomirski
2015-03-04 22:54 ` [tip:x86/asm] x86/asm/entry/64: Remove ' int_check_syscall_exit_work' tip-bot for Andy Lutomirski
2015-02-26 22:40 ` [PATCH 09/16] x86: add comments about various syscall instructions, no code changes Andy Lutomirski
2015-03-04 22:54 ` [tip:x86/asm] x86/asm/entry: Add comments about various syscall instructions tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 10/16] x86: entry_64.S: move save_paranoid and ret_from_fork closer to their users Andy Lutomirski
2015-03-04 22:55 ` [tip:x86/asm] x86/asm/entry/64: Move 'save_paranoid' and ' ret_from_fork' " tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 11/16] x86: entry_64.S: rename save_paranoid to paranoid_entry, no code changes Andy Lutomirski
2015-03-04 22:55 ` [tip:x86/asm] x86/asm/entry/64: Clean up and document various entry code details tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 12/16] x86: ia32entry.S: fold IA32_ARG_FIXUP macro into its callers Andy Lutomirski
2015-03-04 22:55 ` [tip:x86/asm] x86/asm/entry/64/compat: Fold the " tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 13/16] x86: entry_64.S: use more understandable constants Andy Lutomirski
2015-03-04 22:56 ` [tip:x86/asm] x86/asm/entry/64: Use more readable constants tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 14/16] x86: ia32entry.S: use more understandable constant Andy Lutomirski
2015-03-04 22:56 ` [tip:x86/asm] x86/asm/entry/64/compat: Use more readable constant tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 15/16] x86: entry.S: simplify optimistic SYSRET Andy Lutomirski
2015-03-04 21:40 ` Ingo Molnar
2015-03-04 22:56 ` [tip:x86/asm] x86/asm/entry/64: Simplify " tip-bot for Denys Vlasenko
2015-02-26 22:40 ` [PATCH 16/16] x86_64, entry: Remove a bogus ret_from_fork optimization Andy Lutomirski
2015-03-04 22:57 ` [tip:x86/asm] x86/asm/entry/64: Remove a bogus 'ret_from_fork' optimization tip-bot for Andy Lutomirski
2015-03-05 11:49 ` [tip:x86/urgent] " tip-bot for Andy Lutomirski
2015-03-04 21:50 ` [PATCH 00/16] x86/asm changes for 4.1 for review Ingo Molnar
2015-03-04 21:55 ` Andy Lutomirski
2015-02-12 21:54 [PATCH 1/3 v3] x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET Denys Vlasenko
2015-02-12 21:54 ` [PATCH 2/3 v3] x86: entry_64.S: always allocate complete "struct pt_regs" Denys Vlasenko
2015-02-18 20:22 ` Andy Lutomirski
2015-02-25 12:37 ` Andrey Wagin
2015-02-25 13:55 ` Denys Vlasenko
2015-02-25 14:48 ` Sabrina Dubroca
2015-02-25 16:52 ` Denys Vlasenko
2015-02-25 18:42 ` Denys Vlasenko
2015-02-25 19:59 ` Andrey Wagin
2015-02-25 20:10 ` Andy Lutomirski
2015-02-25 21:28 ` Denys Vlasenko
2015-02-25 21:59 ` Andy Lutomirski
2015-02-25 22:40 ` Sabrina Dubroca
2015-02-25 23:34 ` Sabrina Dubroca
2015-02-26 1:12 ` Denys Vlasenko
2015-02-26 5:18 ` Andrew Morton
2015-02-26 6:25 ` Stephen Rothwell
2015-02-26 9:55 ` Denys Vlasenko
2015-02-26 12:11 ` Denys Vlasenko
2015-02-26 13:54 ` Denys Vlasenko
2015-02-26 14:26 ` Sabrina Dubroca
2015-02-26 15:14 ` Andy Lutomirski
2015-02-12 21:54 ` [PATCH 3/3 v3] x86: entry_64.S: fix comments. No code changes Denys Vlasenko
2015-02-18 20:25 ` Andy Lutomirski
2015-02-18 20:00 ` [PATCH 1/3 v3] x86: entry_64.S: fix wrong symbolic constant usage: R11->ARGOFFSET Andy Lutomirski
2015-01-14 21:48 [PATCH 01/11] x86: entry_64.S: always allocate complete "struct pt_regs" Denys Vlasenko
2015-01-14 21:48 ` [PATCH 02/11] x86: code shrink in paranoid_exit Denys Vlasenko
2015-02-11 20:36 ` Andy Lutomirski
2015-02-11 21:01 ` H. Peter Anvin
2015-02-11 21:13 ` Denys Vlasenko
2015-02-11 22:09 ` Andy Lutomirski
2015-02-18 23:26 ` Andy Lutomirski
2015-01-14 21:48 ` [PATCH 03/11] x86: mass removal of ARGOFFSET Denys Vlasenko
2015-02-21 0:31 ` Andy Lutomirski
2015-02-23 14:31 ` Denys Vlasenko
2015-02-23 16:06 ` Andy Lutomirski
2015-01-14 21:48 ` [PATCH 04/11] x86: rename some macros and labels, no code changes Denys Vlasenko
2015-01-14 21:48 ` [PATCH 05/11] x86: add comments about various syscall instructions, " Denys Vlasenko
2015-01-14 21:48 ` [PATCH 06/11] x86: entry_64.S: move save_paranoid and ret_from_fork closer to their users Denys Vlasenko
2015-01-14 21:48 ` [PATCH 07/11] x86: entry_64.S: rename save_paranoid to paranoid_entry, no code changes Denys Vlasenko
2015-02-11 20:39 ` Andy Lutomirski
2015-01-14 21:48 ` [PATCH 08/11] x86: entry_64.S: fold test_in_nmi macro into its only user Denys Vlasenko
2015-02-11 20:40 ` Andy Lutomirski
2015-02-12 2:17 ` Steven Rostedt
2015-01-14 21:48 ` [PATCH 09/11] x86: get rid of KERNEL_STACK_OFFSET Denys Vlasenko
2015-01-14 21:48 ` [PATCH 10/11] x86: ia32entry.S: fold IA32_ARG_FIXUP macro into its callers Denys Vlasenko
2015-01-14 21:48 ` [PATCH 11/11] x86: entry_64.S: use more understandable constants Denys Vlasenko
2015-01-14 22:17 ` [PATCH 01/11] x86: entry_64.S: always allocate complete "struct pt_regs" Denys Vlasenko
2015-01-14 22:29 ` Andy Lutomirski
2015-01-14 22:41 ` Borislav Petkov
2015-01-14 22:50 ` Denys Vlasenko
2015-02-11 20:30 ` Andy Lutomirski
2015-02-11 21:55 ` Denys Vlasenko
2015-02-11 22:03 ` Andy Lutomirski
2015-01-11 23:07 [PATCH] x86: introduce push/pop macros which generate CFI_REL_OFFSET and CFI_RESTORE Denys Vlasenko
2015-01-12 0:38 ` Andy Lutomirski
2015-01-12 6:23 ` Denys Vlasenko
2015-01-12 19:23 ` Borislav Petkov
2015-01-12 19:25 ` Andy Lutomirski
2015-01-12 19:37 ` Borislav Petkov
2015-01-12 19:46 ` Andy Lutomirski
2015-01-12 20:11 ` Borislav Petkov
2015-01-12 20:14 ` Andy Lutomirski
2015-01-12 20:22 ` H. Peter Anvin
2015-01-12 20:26 ` Andy Lutomirski
2015-01-12 21:03 ` Borislav Petkov
2015-01-13 12:07 ` Denys Vlasenko
2015-01-12 20:32 ` Borislav Petkov
2015-02-11 20:24 ` Andy Lutomirski
2015-01-08 16:25 [PATCH 0/4] x86: entry.S cleanup Denys Vlasenko
2015-01-08 16:25 ` [PATCH 3/4] x86: open-code register save/restore in trace_hardirqs thunks Denys Vlasenko
2015-01-09 10:55 ` Borislav Petkov
2015-01-09 20:29 ` Denys Vlasenko
2015-01-10 13:52 ` Borislav Petkov
2015-01-09 12:19 ` Borislav Petkov
2015-01-09 18:54 ` Denys Vlasenko
2015-01-10 14:23 ` Borislav Petkov
2015-01-10 20:14 ` Denys Vlasenko
2015-01-10 20:17 ` Andy Lutomirski
2015-01-10 20:42 ` Borislav Petkov
2015-01-10 21:02 ` Andy Lutomirski
2015-01-10 21:09 ` Denys Vlasenko
2015-01-10 21:27 ` Linus Torvalds
2015-01-10 21:57 ` Denys Vlasenko
2015-01-10 20:43 ` Denys Vlasenko
2015-01-10 21:08 ` Linus Torvalds
2015-01-10 21:26 ` Borislav Petkov
2015-01-10 22:00 ` Borislav Petkov
2015-01-10 22:03 ` Denys Vlasenko
2015-01-10 22:04 ` Andy Lutomirski
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