linux-kernel - [tip:perf/core] uprobes: Remove insert_vm_struct()->uprobe

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Message-ID: <tip-89133786f9408d53361874a8c784fff150fc7f7c@git.kernel.org>
Date:	Mon, 30 Jul 2012 07:16:44 -0700
From:	tip-bot for Oleg Nesterov <oleg@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, anton@...hat.com, hpa@...or.com,
	mingo@...nel.org, srikar@...ux.vnet.ibm.com, oleg@...hat.com,
	tglx@...utronix.de
Subject: [tip:perf/core] uprobes: Remove insert_vm_struct()->uprobe_mmap()

Commit-ID:  89133786f9408d53361874a8c784fff150fc7f7c
Gitweb:     http://git.kernel.org/tip/89133786f9408d53361874a8c784fff150fc7f7c
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Sun, 29 Jul 2012 20:22:38 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 30 Jul 2012 11:27:22 +0200

uprobes: Remove insert_vm_struct()->uprobe_mmap()

Remove insert_vm_struct()->uprobe_mmap(). It is not needed, nobody
except arch/ia64/kernel/perfmon.c uses insert_vm_struct(vma)
with vma->vm_file != NULL.

And it is wrong. Again, get_user_pages() can not succeed before
vma_link(vma) makes is visible to find_vma(). And even if this
worked, we must not insert the new bp before this mapping is
visible to vma_prio_tree_foreach() for uprobe_unregister().

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Srikar Dronamraju <srikar.vnet.ibm.com>
Cc: Anton Arapov <anton@...hat.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/20120729182238.GA20349@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 mm/mmap.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index e5a4614..4fe2697 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2345,9 +2345,6 @@ int insert_vm_struct(struct mm_struct * mm, struct vm_area_struct * vma)
 	     security_vm_enough_memory_mm(mm, vma_pages(vma)))
 		return -ENOMEM;
 
-	if (vma->vm_file && uprobe_mmap(vma))
-		return -EINVAL;
-
 	vma_link(mm, vma, prev, rb_link, rb_parent);
 	return 0;
 }
--
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