From: Oleg Nesterov <oleg@redhat.com>
Date: Sun, 23 Sep 2012 19:30:44 +0000 (+0200)
Subject: uprobes: Kill set_orig_insn()->is_swbp_at_addr()
X-Git-Tag: v3.7-rc3~40^2~1^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed6f6a50dc5f183c53e7b3b7fed4794bc50d9aa7;p=pandora-kernel.git

uprobes: Kill set_orig_insn()->is_swbp_at_addr()

Unlike set_swbp(), set_orig_insn()->is_swbp_at_addr() makes sense,
although it can't prevent all confusions.

But the usage of is_swbp_at_addr() is equally confusing, and it adds
the extra get_user_pages() we can avoid.

This patch removes set_orig_insn()->is_swbp_at_addr() but changes
write_opcode() to do the necessary checks before replace_page().

Perhaps it also makes sense to ensure PAGE_MAPPING_ANON in unregister
case.

find_active_uprobe() becomes the only user of is_swbp_at_addr(),
we can change its semantics.

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