From: David Miller <davem@davemloft.net>
To: rostedt@goodmis.org
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
akpm@linux-foundation.org, fweisbec@gmail.com, jbaron@redhat.com,
ddaney@caviumnetworks.com
Subject: Re: [PATCH 4/8] jump label: Make arch_jump_label_text_poke_early() optional
Date: Fri, 29 Oct 2010 13:37:59 -0700 (PDT) [thread overview]
Message-ID: <20101029.133759.48489968.davem@davemloft.net> (raw)
In-Reply-To: <20101028135647.822609872@goodmis.org>
From: Steven Rostedt <rostedt@goodmis.org>
Date: Thu, 28 Oct 2010 09:55:52 -0400
> From: David Daney <ddaney@caviumnetworks.com>
>
> For the forthcoming MIPS jump label support,
> arch_jump_label_text_poke_early() is unneeded as the MIPS NOP
> instruction is already optimal.
>
> Supply a default implementation that does nothing. Flag x86 and SPARC
> as having arch_jump_label_text_poke_early().
>
> Cc: Jason Baron <jbaron@redhat.com>
> Cc: David Miller <davem@davemloft.net>
> Signed-off-by: David Daney <ddaney@caviumnetworks.com>
> LKML-Reference: <1286218615-24011-2-git-send-email-ddaney@caviumnetworks.com>
> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
On the SPARC side, it's not that the nop isn't optimal, on sparc it's
always 0x01000000. The issue is that when written an I-cache flush is
necessary using a 'flushi' instruction.
Does MIPS not need a flush when poking instructions? I find this hard
to believe, although it's been some time since I last touched that
architecture :-)
next prev parent reply other threads:[~2010-10-29 20:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-28 13:55 [PATCH 0/8] [GIT PULL] jump label: various fixes and updates Steven Rostedt
2010-10-28 13:55 ` [PATCH 1/8] jump label: Fix module __init section race Steven Rostedt
2010-10-28 13:55 ` [PATCH 2/8] jump label: Fix deadlock b/w jump_label_mutex vs. text_mutex Steven Rostedt
2010-10-28 13:55 ` [PATCH 3/8] jump label: Fix error with preempt disable holding mutex Steven Rostedt
2010-10-29 4:20 ` Masami Hiramatsu
2010-10-28 13:55 ` [PATCH 4/8] jump label: Make arch_jump_label_text_poke_early() optional Steven Rostedt
2010-10-29 20:37 ` David Miller [this message]
2010-10-29 20:48 ` David Daney
2010-10-28 13:55 ` [PATCH 5/8] jump label: Add MIPS support Steven Rostedt
2010-10-28 13:55 ` [PATCH 6/8] jump_label: Fix unaligned traps on sparc Steven Rostedt
2010-10-28 13:55 ` [PATCH 7/8] x86, ftrace: Use safe noops, drop trap test Steven Rostedt
2010-10-28 13:55 ` [PATCH 8/8] jump label: Disable due to compiler bug Steven Rostedt
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