From: Anton Arapov <anton@redhat.com>
Date: Wed, 3 Apr 2013 16:00:32 +0000 (+0200)
Subject: uretprobes: Reserve the first slot in xol_vma for trampoline
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~119^2~9^2~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e78aebfd27256ca59ccd3e6cf62cfad2a80e02d3;p=pandora-kernel.git

uretprobes: Reserve the first slot in xol_vma for trampoline

Allocate trampoline page, as the very first one in uprobed
task xol area, and fill it with breakpoint opcode.

Also introduce get_trampoline_vaddr() helper, to wrap the
trampoline address extraction from area->vaddr. That removes
confusion and eases the debug experience in case ->vaddr
notion will be changed.

Signed-off-by: Anton Arapov <anton@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---

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