From: David Miller <davem@davemloft.net>
To: dhowells@redhat.com
Cc: oleg@redhat.com, linux-arch@vger.kernel.org
Subject: Re: [PATCH 2/3] Mark the 'current' pointer register read-only when such a thing exists
Date: Tue, 18 May 2010 14:05:46 -0700 (PDT) [thread overview]
Message-ID: <20100518.140546.170125902.davem@davemloft.net> (raw)
In-Reply-To: <20100518164542.6194.451.stgit@warthog.procyon.org.uk>
From: David Howells <dhowells@redhat.com>
Date: Tue, 18 May 2010 17:45:42 +0100
> Where the value of current is kept in a register, that register can be marked
> such that the pointer value is read only, e.g.:
>
> register struct task_struct *const current asm("e2");
>
> This prevents inadvertent assignment outside of assembly code.
>
> This has been available on the MN10300 arch for a while now, and I've also
> tested it on the FRV arch.
>
> Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
next prev parent reply other threads:[~2010-05-18 21:05 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-18 16:45 [PATCH 1/3] Reduce get_current() to the asm-generic implementation where possible David Howells
2010-05-18 16:45 ` [PATCH 2/3] Mark the 'current' pointer register read-only when such a thing exists David Howells
2010-05-18 21:05 ` David Miller [this message]
2010-05-18 16:45 ` [PATCH 3/3] Make get_current() __attribute__((const)) David Howells
2010-05-18 21:22 ` schedule() && prev/current (Was: [PATCH 3/3] Make get_current() __attribute__((const))) Oleg Nesterov
2010-05-19 6:21 ` Peter Zijlstra
2010-05-19 10:27 ` Oleg Nesterov
2010-05-19 10:37 ` Peter Zijlstra
2010-05-19 12:57 ` [PATCH] schedule: simplify the reacquire_kernel_lock() logic Oleg Nesterov
2010-05-19 12:57 ` Oleg Nesterov
2010-05-19 13:11 ` Yong Zhang
2010-05-19 13:07 ` schedule() && prev/current (Was: [PATCH 3/3] Make get_current() __attribute__((const))) Yong Zhang
2010-05-19 13:07 ` Yong Zhang
2010-05-18 17:39 ` [PATCH 1/3] Reduce get_current() to the asm-generic implementation where possible Kyle McMartin
2010-05-18 19:47 ` Jamie Lokier
2010-05-19 6:21 ` Nick Piggin
2010-05-19 11:02 ` Oleg Nesterov
2010-05-21 10:13 ` David Howells
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