From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tony Luck <tony.luck@gmail.com>,
David Daney <ddaney.cavm@gmail.com>,
Borislav Petkov <bp@amd64.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
David Daney <ddaney@caviumnetworks.com>
Subject: Re: [PATCH 3/3] x86, extable: Handle early exceptions
Date: Thu, 19 Apr 2012 16:10:14 -0700 [thread overview]
Message-ID: <4F909B56.60001@zytor.com> (raw)
In-Reply-To: <CA+55aFx8EDb3MOrpky7aBf28=5XQ41ebuunO5aYrnUY1haVzcA@mail.gmail.com>
On 04/19/2012 03:58 PM, Linus Torvalds wrote:
>
> In fact, doing an "objdump" on the few modules I have, I didn't find a
> *single* exception table entry. Maybe I did something wrong? Isn't it
> the __ex_table in modules too?
>
It is, but I suspect a lot of modules don't end up with any exception
table entries, as the common forms of user space access are out of line.
I suspect that just finding the module we're in or not in before
searching its ex_table is probably good enough, but a global hash would
be better. That being said, some distros are complaining about the
amount of time it takes to load modules on boot...
-hpa
next prev parent reply other threads:[~2012-04-19 23:10 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-19 0:16 [PATCH 0/5] RFC: x86: Early exception table support H. Peter Anvin
2012-04-19 0:16 ` [PATCH 1/5] x86, nop: Make the ASM_NOP* macros work from assembly H. Peter Anvin
2012-04-19 9:29 ` Borislav Petkov
2012-04-20 0:24 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 2/5] x86: Add symbolic constant for exceptions with error code H. Peter Anvin
2012-04-19 9:30 ` Borislav Petkov
2012-04-20 0:25 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 3/5] x86, paravirt: Replace GET_CR2_INTO_RCX with GET_CR2_INTO_RAX H. Peter Anvin
2012-04-20 0:26 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 4/5] x86-64: Handle exception table entries during early boot H. Peter Anvin
2012-04-19 13:02 ` Borislav Petkov
2012-04-19 16:59 ` H. Peter Anvin
2012-04-19 17:16 ` Borislav Petkov
2012-04-20 0:29 ` [tip:x86/extable] x86, doc: Revert "x86: Document rdmsr_safe restrictions" tip-bot for H. Peter Anvin
2012-04-20 0:28 ` [tip:x86/extable] x86-64: Handle exception table entries during early boot tip-bot for H. Peter Anvin
2012-04-19 0:16 ` [PATCH 5/5] x86-32: " H. Peter Anvin
2012-04-20 0:28 ` [tip:x86/extable] " tip-bot for H. Peter Anvin
2012-04-19 9:22 ` [PATCH 0/5] RFC: x86: Early exception table support Borislav Petkov
2012-04-19 9:24 ` [PATCH 1/3] x86, extable: Cleanup fixup_exception Borislav Petkov
2012-04-19 9:25 ` [PATCH 2/3] x86, extable: Carve out the main extable searching routine Borislav Petkov
2012-04-19 9:26 ` [PATCH 3/3] x86, extable: Handle early exceptions Borislav Petkov
2012-04-19 17:02 ` H. Peter Anvin
2012-04-19 17:27 ` Linus Torvalds
2012-04-19 17:38 ` Borislav Petkov
2012-04-19 17:59 ` H. Peter Anvin
2012-04-19 18:25 ` Linus Torvalds
2012-04-19 18:55 ` H. Peter Anvin
2012-04-19 20:17 ` David Daney
2012-04-19 20:20 ` H. Peter Anvin
2012-04-19 20:26 ` H. Peter Anvin
2012-04-19 20:40 ` David Daney
2012-04-19 21:47 ` Linus Torvalds
2012-04-19 22:16 ` H. Peter Anvin
2012-04-19 22:47 ` Tony Luck
2012-04-19 22:58 ` Linus Torvalds
2012-04-19 23:10 ` H. Peter Anvin [this message]
2012-04-19 23:26 ` Tony Luck
2012-04-19 23:35 ` H. Peter Anvin
2012-04-20 8:26 ` Andreas Schwab
2012-04-19 18:11 ` Linus Torvalds
2012-04-20 8:46 ` Borislav Petkov
2012-04-19 17:54 ` H. Peter Anvin
2012-04-20 0:27 ` [tip:x86/extable] x86, extable: Add early_fixup_exception() tip-bot for H. Peter Anvin
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