Author: hselasky
Date: Mon May 4 08:05:01 2020
New Revision: 360621
URL: https://svnweb.freebsd.org/changeset/base/360621
Log:
Fix warning about sleeping with non-sleepable lock when allocating
"current" from linux_cdev_pager_populate() in the LinuxKPI:
Backtrace:
witness_debugger()
witness_warn()
uma_zalloc_arg()
malloc()
linux_alloc_current()
linux_cdev_pager_populate()
vm_fault()
vm_fault_trap()
trap_pfault()
trap()
calltrap()
Suggested by: avg@
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/src/linux_compat.c
Modified: head/sys/compat/linuxkpi/common/src/linux_compat.c
==============================================================================
--- head/sys/compat/linuxkpi/common/src/linux_compat.c Mon May 4 07:57:55
2020 (r360620)
+++ head/sys/compat/linuxkpi/common/src/linux_compat.c Mon May 4 08:05:01
2020 (r360621)
@@ -525,14 +525,14 @@ linux_cdev_pager_populate(vm_object_t vm_obj, vm_pinde
struct vm_area_struct *vmap;
int err;
- linux_set_current(curthread);
-
/* get VM area structure */
vmap = linux_cdev_handle_find(vm_obj->handle);
MPASS(vmap != NULL);
MPASS(vmap->vm_private_data == vm_obj->handle);
VM_OBJECT_WUNLOCK(vm_obj);
+
+ linux_set_current(curthread);
down_write(&vmap->vm_mm->mmap_sem);
if (unlikely(vmap->vm_ops == NULL)) {
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