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From: Linus Torvalds <torvalds@linux-foundation.org>
To: David Daney <david.s.daney@gmail.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>,
	David Daney <ddaney.cavm@gmail.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	x86@kernel.org, Michal Marek <mmarek@suse.cz>,
	linux-kernel@vger.kernel.org, linux-mips@linux-mips.org,
	Andrew Morton <akpm@linux-foundation.org>,
	David Daney <david.daney@cavium.com>
Subject: Re: [PATCH v1 1/5] scripts: Add sortextable to sort the kernel's exception table.
Date: Thu, 19 Apr 2012 20:31:26 -0700	[thread overview]
Message-ID: <CA+55aFyijf43qSu3N9nWHEBwaGbb7T2Oq9A=9EyR=Jtyqfq_cQ@mail.gmail.com> (raw)
In-Reply-To: <4F90D564.3090508@gmail.com>

On Thu, Apr 19, 2012 at 8:17 PM, David Daney <david.s.daney@gmail.com> wrote:
>
> I hadn't considered that the image was relocatable.  Our MIPS kernels never
> have relocations.
>
> I am working on a version of this that handles the relocations.  It
> shouldn't be too difficult.

It might be better to just make the rule be that we don't have
relocations there - make everything relative to the start of the code
segment or something.

On x86, we already use that _ASM_EXTABLE() macro to hide the
differences between x86-64 and x86-32. So it should be be somewhat
easy to make that same macro make it relative to the code start, and
at the same time also make the exception table perhaps be two 32-bit
words rather than two pointers.

So it would shrink the exception table and avoid relocations at the
same time. Win-win. No?

                      Linus

  reply	other threads:[~2012-04-20  3:31 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-19 21:59 [PATCH v2 0/5] Speed booting by sorting exception tables at build time David Daney
2012-04-19 21:59 ` [PATCH v1 1/5] scripts: Add sortextable to sort the kernel's exception table David Daney
2012-04-20  0:20   ` [tip:x86/extable] scripts: Add sortextable to sort the kernel' s " tip-bot for David Daney
2012-04-20  1:44   ` [PATCH v1 1/5] scripts: Add sortextable to sort the kernel's " H. Peter Anvin
2012-04-20  3:17     ` David Daney
2012-04-20  3:31       ` Linus Torvalds [this message]
2012-04-20  3:42         ` H. Peter Anvin
2012-04-20  4:49           ` H. Peter Anvin
2012-04-20  4:54             ` H. Peter Anvin
2012-04-20 21:55         ` [tip:x86/extable] x86, extable: Use .pushsection ... . popsection for _ASM_EXTABLE() tip-bot for H. Peter Anvin
2012-04-20 21:56         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/ia32/ia32entry.S tip-bot for H. Peter Anvin
2012-04-20 21:57         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/kernel/entry_32.S tip-bot for H. Peter Anvin
2012-04-20 21:58         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/kernel/entry_64.S tip-bot for H. Peter Anvin
2012-04-20 21:58         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/kernel/test_rodata.c tip-bot for H. Peter Anvin
2012-04-20 21:59         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/checksum_32.S tip-bot for H. Peter Anvin
2012-04-20 22:00         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/copy_user_64.S tip-bot for H. Peter Anvin
2012-04-20 22:01         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/ copy_user_nocache_64.S tip-bot for H. Peter Anvin
2012-04-20 22:02         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/csum-copy_64.S tip-bot for H. Peter Anvin
2012-04-20 22:03         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/getuser.S tip-bot for H. Peter Anvin
2012-04-20 22:03         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/putuser.S tip-bot for H. Peter Anvin
2012-04-20 22:04         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/lib/usercopy_32.c tip-bot for H. Peter Anvin
2012-04-20 22:05         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/um/checksum_32.S tip-bot for H. Peter Anvin
2012-04-20 22:06         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/xen/xen-asm_32.S tip-bot for H. Peter Anvin
2012-04-20 22:07         ` [tip:x86/extable] x86, extable: Remove the now-unused __ASM_EX_SEC macros tip-bot for H. Peter Anvin
2012-04-20 22:08         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/include/asm/kvm_host .h tip-bot for H. Peter Anvin
2012-04-20 22:08         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/include/asm/xsave.h tip-bot for H. Peter Anvin
2012-04-21  0:16         ` [tip:x86/extable] x86, extable: Remove open-coded exception table entries in arch/x86/ia32/ia32entry.S tip-bot for H. Peter Anvin
2012-04-21  0:17         ` [tip:x86/extable] x86, extable: Add _ASM_EXTABLE_EX() macro tip-bot for H. Peter Anvin
2012-04-21  1:16         ` [tip:x86/extable] x86, extable: Disable presorted exception table for now tip-bot for H. Peter Anvin
2012-04-21  1:17         ` [tip:x86/extable] x86, extable: Switch to relative exception table entries tip-bot for H. Peter Anvin
2012-04-20 14:59   ` [PATCH v1 1/5] scripts: Add sortextable to sort the kernel's exception table Sam Ravnborg
2012-04-20 16:49     ` David Daney
2012-04-19 21:59 ` [PATCH v2 2/5] extable: Skip sorting if sorted at build time David Daney
2012-04-20  0:21   ` [tip:x86/extable] " tip-bot for David Daney
2012-04-19 21:59 ` [PATCH v2 3/5] kbuild/extable: Hook up sortextable into the build system David Daney
2012-04-20  0:22   ` [tip:x86/extable] " tip-bot for David Daney
2012-04-20 15:02   ` [PATCH v2 3/5] " Sam Ravnborg
2012-04-19 21:59 ` [PATCH v2 4/5] MIPS: Select BUILDTIME_EXTABLE_SORT David Daney
2012-04-20  0:23   ` [tip:x86/extable] " tip-bot for David Daney
2012-04-19 21:59 ` [PATCH v2 5/5] x86: " David Daney
2012-04-20  0:23   ` [tip:x86/extable] " tip-bot for David Daney

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