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munmap: fix deadlock with remote pagefault on vm range lock

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Add similar protection to clear_host_pte than to set_host_vma (see #986)

Also make the page fault handler only skip taking lock if the munmap
happened on the same cpu id

Change-Id: I6d9e68e8f8905b20bb2ccfa72848e04fe6404ab6
This commit is contained in:
Dominique Martinet
2019-03-28 14:01:15 +09:00
committed by Balazs Gerofi
parent 621533bbd3
commit a563d780c1
6 changed files with 25 additions and 22 deletions
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2
kernel/include/process.h
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@ -750,7 +750,7 @@ struct process_vm {
// 2. addition of process page table (allocate_pages, update_process_page_table)
// note that physical memory allocator (ihk_mc_alloc_pages, ihk_pagealloc_alloc)
// is protected by its own lock (see ihk/manycore/generic/page_alloc.c)
unsigned long is_memory_range_lock_taken;
int is_memory_range_lock_taken;
/* #986: Fix deadlock between do_page_fault_process_vm() and set_host_vma() */
ihk_atomic_t refcount;