diff mbox series

[v1,11/14] mm/mshare: unmap vmas in mshare_unlink

Message ID fa5583368b0a6492ecb13180c29d7bfb29f73dd9.1649370874.git.khalid.aziz@oracle.com (mailing list archive)
State New
Headers show
Series Add support for shared PTEs across processes | expand

Commit Message

Khalid Aziz April 11, 2022, 4:05 p.m. UTC 
mshare() maps in vma for the calling task. These vmas should be
unmapped when the task calls mshare_unlink(). Add minimal code to
unmap vmas.

Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
---
 mm/mshare.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/mm/mshare.c b/mm/mshare.c
index 40c495ffc0ca..ec23d1db79b2 100644
--- a/mm/mshare.c
+++ b/mm/mshare.c
@@ -490,6 +490,17 @@  SYSCALL_DEFINE1(mshare_unlink, const char *, name)
 		mmput(info->mm);
 		kfree(info);
 	} else {
+		/*
+		 * TODO: If mshare'd range is still mapped in the process,
+		 * it should be unmapped. Following is minimal code and
+		 * might need fix up
+		 */
+		unsigned long tmp;
+
+		tmp = info->mm->task_size - info->mm->mmap_base;
+		if (info->host_mm != current->mm)
+			vm_munmap(info->mm->mmap_base, tmp);
+
 		dput(dentry);
 	}