From: Oleg Nesterov <oleg@redhat.com>
Date: Sun, 29 Jul 2012 18:22:12 +0000 (+0200)
Subject: uprobes: Don't recheck vma/f_mapping in write_opcode()
X-Git-Tag: v3.6-rc1~32^2~13
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f403072c6108e15f319a4a5036b650c77760522c;p=pandora-kernel.git

uprobes: Don't recheck vma/f_mapping in write_opcode()

write_opcode() rechecks valid_vma() and ->f_mapping, this is
pointless. The caller, register_for_each_vma() or uprobe_mmap(),
has already done these checks under mmap_sem.

To clarify, uprobe_mmap() checks valid_vma() only, but we can
rely on build_probe_list(vm_file->f_mapping->host).

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120729182212.GA20304@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

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