From: Grazvydas Ignotas <notasas@gmail.com>
Date: Sat, 7 Feb 2015 19:22:28 +0000 (+0200)
Subject: mm: allow remote_vm access to non-io pfnmap memory
X-Git-Tag: sz_173~67
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=9d108bea65355f33a7d1533ca60184d99750238c;hp=e2dc9d598b4945be932e176ff19b9f804c7ab1a4

mm: allow remote_vm access to non-io pfnmap memory

this allows gdb to see the framebuffer and DSP shared memory
---

diff --git a/mm/memory.c b/mm/memory.c
index e138bf4885b5..b9a95f103d49 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -3875,7 +3875,11 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
 			vma = find_vma(mm, addr);
 			if (!vma || vma->vm_start > addr)
 				break;
-			if (vma->vm_ops && vma->vm_ops->access)
+			if ((vma->vm_flags & VM_PFNMAP) &&
+			    !(vma->vm_flags & VM_IO))
+				ret = generic_access_phys(vma, addr, buf,
+							  len, write);
+			if (ret <= 0 && vma->vm_ops && vma->vm_ops->access)
 				ret = vma->vm_ops->access(vma, addr, buf,
 							  len, write);
 			if (ret <= 0)