From: liuj97@gmail.com (Jiang Liu)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 0/7] Optimize jump label implementation on ARM64
Date: Mon, 14 Oct 2013 23:24:50 +0800 [thread overview]
Message-ID: <525C0CC2.7080305@gmail.com> (raw)
In-Reply-To: <20131014151938.GJ10491@mudshark.cambridge.arm.com>
On 10/14/2013 11:19 PM, Will Deacon wrote:
> On Sun, Oct 13, 2013 at 03:50:20PM +0100, Jiang Liu wrote:
>> From: Jiang Liu <jiang.liu@huawei.com>
>>
>> This patchset tries to optimize arch specfic jump label implementation
>> for ARM64 by dynamic kernel text patching.
>>
>> To enable this feature, your toolchain must support "asm goto" extension
>> and "%c" constraint extesion. Current GCC for AARCH64 doesn't support
>> "%c", so you need a GCC patch similiar to this:
>> http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm.c?view=patch&r1=175293&r2=175565&pathrev=175565
>> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48637
>
> Right, but this is just for the ARM (AArch32) backend afaict. Are there any
> plans for upstream GCC to support this constraint for AArch64?
>
> Will
>
Hi Will,
We have an internal GCC version with this issue fixed. But I'm not
familiar with GCC community and don't know the way to get the fix merged
into GCC mainstream. Any suggestion?
Thanks!
next prev parent reply other threads:[~2013-10-14 15:24 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-13 14:50 [PATCH v2 0/7] Optimize jump label implementation on ARM64 Jiang Liu
2013-10-13 14:50 ` [PATCH v2 1/7] arm64: introduce basic aarch64 instruction decoding helpers Jiang Liu
2013-10-13 14:50 ` [PATCH v2 2/7] arm64: introduce interfaces to hotpatch kernel and module code Jiang Liu
2013-10-13 14:50 ` [PATCH v2 3/7] arm64: move encode_insn_immediate() from module.c to insn.c Jiang Liu
2013-10-13 14:50 ` [PATCH v2 4/7] arm64: introduce aarch64_insn_gen_{nop|branch_imm}() helper functions Jiang Liu
2013-10-14 14:24 ` [PATCH] " Jiang Liu
2013-10-13 14:50 ` [PATCH v2 5/7] arm64, jump label: detect %c support for ARM64 Jiang Liu
2013-10-13 14:50 ` [PATCH v2 6/7] arm64, jump label: optimize jump label implementation Jiang Liu
2013-10-13 14:50 ` [PATCH v2 7/7] jump_label: use defined macros instead of hard-coding for better readability Jiang Liu
2013-10-14 15:19 ` [PATCH v2 0/7] Optimize jump label implementation on ARM64 Will Deacon
2013-10-14 15:24 ` Jiang Liu [this message]
2013-10-14 15:40 ` Russell King - ARM Linux
2013-10-14 15:57 ` Jiang Liu
2013-10-14 16:04 ` Russell King - ARM Linux
2013-10-14 16:41 ` Will Deacon
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