From: hpa@zytor•com (H. Peter Anvin)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 0/6] generic relative extable support
Date: Mon, 04 Jan 2016 10:15:28 -0800 [thread overview]
Message-ID: <568AB6C0.4060502@zytor.com> (raw)
In-Reply-To: <20160104112026.GC4179@osiris>
On 01/04/2016 03:20 AM, Heiko Carstens wrote:
> On Sun, Jan 03, 2016 at 05:05:51PM +0100, Ard Biesheuvel wrote:
>> There are currently four architectures (x86, ia64, alpha and s390) whose
>> user-access exception tables are relative to the table entry address rather
>> than absolute. Each of these architectures has its own search_extable() and
>> sort_extable() implementation, which are not only mostly identical to each
>> other, but also deviate very little from the generic absolute implementations
>> in lib/extable.c that they override.
>>
>> So before making arm64 the fifth architecture that reimplements this, let's
>> refactor the existing code so that all of these architectures use common code
>> for searching and sorting the relative extables. Archs may set
>> ARCH_HAS_RELATIVE_EXTABLE to indicate that the table consists of a pair of
>> relative ints, and may define swap_ex_entry_fixup() if the fixup member needs
>> special treatment in the swapping step of the sorting routine (such as alpha).
>>
>> Note that the s390 patch applies on top of the following patch:
>>
>> http://article.gmane.org/gmane.linux.kernel/2117036
>>
>> which fixes a bug I spotted while working on this code. Since that probably
>> needs to go to -stable, I broke it out and posted it separately.
>>
>> Ard Biesheuvel (6):
>> extable: add support for relative extables to search and sort routines
>> alpha/extable: use generic search and sort routines
>> s390/extable: use generic search and sort routines
>> x86/extable: use generic search and sort routines
>> ia64/extable: use generic search and sort routines
>> arm64: switch to relative exception tables
>
> For the s390 bits:
>
> Acked-by: Heiko Carstens <heiko.carstens@de•ibm.com>
>
For the x86 bits:
Acked-by: H. Peter Anvin <hpa@linux•intel.com>
*However*, please see my comment about generalizing _ASM_EXTABLE() for
the non-x86 architectures.
-hpa
prev parent reply other threads:[~2016-01-04 18:15 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-03 16:05 [PATCH 0/6] generic relative extable support Ard Biesheuvel
2016-01-03 16:05 ` [PATCH 1/6] extable: add support for relative extables to search and sort routines Ard Biesheuvel
2016-01-04 21:05 ` Helge Deller
2016-01-03 16:05 ` [PATCH 2/6] alpha/extable: use generic " Ard Biesheuvel
2016-01-03 16:05 ` [PATCH 3/6] s390/extable: " Ard Biesheuvel
2016-01-03 16:05 ` [PATCH 4/6] x86/extable: " Ard Biesheuvel
2016-01-03 16:05 ` [PATCH 5/6] ia64/extable: " Ard Biesheuvel
2016-01-03 16:05 ` [PATCH 6/6] arm64: switch to relative exception tables Ard Biesheuvel
2016-01-04 14:46 ` Will Deacon
2016-01-04 18:13 ` H. Peter Anvin
2016-01-04 18:20 ` Luck, Tony
2016-01-04 18:47 ` H. Peter Anvin
2016-01-04 19:21 ` H. Peter Anvin
2016-01-04 19:28 ` Ard Biesheuvel
2016-01-04 19:49 ` Luck, Tony
2016-01-04 11:20 ` [PATCH 0/6] generic relative extable support Heiko Carstens
2016-01-04 18:15 ` H. Peter Anvin [this message]
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