Author: kib
Date: Sun Jan 6 00:45:41 2019
New Revision: 342800
URL: https://svnweb.freebsd.org/changeset/base/342800
Log:
MFC r342627:
Implement zap_vma_ptes() for managed device objects.
Modified:
stable/12/sys/compat/linuxkpi/common/include/linux/mm.h
stable/12/sys/compat/linuxkpi/common/src/linux_compat.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/compat/linuxkpi/common/include/linux/mm.h
==============================================================================
--- stable/12/sys/compat/linuxkpi/common/include/linux/mm.h Sun Jan 6
00:44:32 2019 (r342799)
+++ stable/12/sys/compat/linuxkpi/common/include/linux/mm.h Sun Jan 6
00:45:41 2019 (r342800)
@@ -180,12 +180,8 @@ apply_to_page_range(struct mm_struct *mm, unsigned lon
return (-ENOTSUP);
}
-static inline int
-zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
- unsigned long size)
-{
- return (-ENOTSUP);
-}
+int zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+ unsigned long size);
static inline int
remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
Modified: stable/12/sys/compat/linuxkpi/common/src/linux_compat.c
==============================================================================
--- stable/12/sys/compat/linuxkpi/common/src/linux_compat.c Sun Jan 6
00:44:32 2019 (r342799)
+++ stable/12/sys/compat/linuxkpi/common/src/linux_compat.c Sun Jan 6
00:45:41 2019 (r342800)
@@ -672,6 +672,25 @@ static struct cdev_pager_ops linux_cdev_pager_ops[2] =
},
};
+int
+zap_vma_ptes(struct vm_area_struct *vma, unsigned long address,
+ unsigned long size)
+{
+ vm_object_t obj;
+ vm_page_t m;
+
+ obj = vma->vm_obj;
+ if (obj == NULL || (obj->flags & OBJ_UNMANAGED) != 0)
+ return (-ENOTSUP);
+ VM_OBJECT_RLOCK(obj);
+ for (m = vm_page_find_least(obj, OFF_TO_IDX(address));
+ m != NULL && m->pindex < OFF_TO_IDX(address + size);
+ m = TAILQ_NEXT(m, listq))
+ pmap_remove_all(m);
+ VM_OBJECT_RUNLOCK(obj);
+ return (0);
+}
+
#define OPW(fp,td,code) ({ \
struct file *__fpop; \
__typeof(code) __retval; \
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