From: Andrew Morton <akpm@linux-foundation.org>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
linux-s390@vger.kernel.org, x86@kernel.org, hpa@zytor.com,
heiko.carstens@de.ibm.com, rth@twiddle.net, tony.luck@intel.com,
will.deacon@arm.com, deller@gmx.de
Subject: Re: [PATCH v2 resend 6/6] arm64: switch to relative exception tables
Date: Wed, 27 Jan 2016 11:35:48 -0800 [thread overview]
Message-ID: <20160127113548.d4f2f2a7029b3b89f0e596da@linux-foundation.org> (raw)
In-Reply-To: <1453892123-17973-7-git-send-email-ard.biesheuvel@linaro.org>
On Wed, 27 Jan 2016 11:55:23 +0100 Ard Biesheuvel <ard.biesheuvel@linaro.org> wrote:
> Instead of using absolute addresses for both the exception location
> and the fixup, use offsets relative to the exception table entry values.
> Not only does this cut the size of the exception table in half, it is
> also a prerequisite for KASLR, since absolute exception table entries
> are subject to dynamic relocation, which is incompatible with the sorting
> of the exception table that occurs at build time.
>
> This patch also introduces the _ASM_EXTABLE preprocessor macro (which
> exists on x86 as well) and its _asm_extable assembly counterpart, as
> shorthands to emit exception table entries.
checkpatch speaketh truth:
ERROR: #define of 'ARCH_HAS_RELATIVE_EXTABLE' is wrong - use Kconfig variables or standard guards instead
#113: FILE: arch/arm64/include/asm/uaccess.h:56:
next prev parent reply other threads:[~2016-01-27 19:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-27 10:55 [PATCH v2 resend 0/6] generic relative extable support Ard Biesheuvel
2016-01-27 10:55 ` [PATCH v2 resend 1/6] extable: add support for relative extables to search and sort routines Ard Biesheuvel
2016-01-27 10:55 ` [PATCH v2 resend 2/6] alpha/extable: use generic " Ard Biesheuvel
2016-01-27 10:55 ` [PATCH v2 resend 3/6] s390/extable: " Ard Biesheuvel
2016-01-27 10:55 ` [PATCH v2 resend 4/6] x86/extable: " Ard Biesheuvel
2016-01-27 10:55 ` [PATCH v2 resend 5/6] ia64/extable: " Ard Biesheuvel
2016-01-27 10:55 ` [PATCH v2 resend 6/6] arm64: switch to relative exception tables Ard Biesheuvel
2016-01-27 19:35 ` Andrew Morton [this message]
2016-01-27 19:39 ` Ard Biesheuvel
2016-01-27 19:46 ` Andrew Morton
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