tree 2ebb9eed3eee9df643e3a3657ce89311b1024930
parent 5b716ac728bcc01b1f2a7ed6e437196602237c27
author Gerald Schaefer <gerald.schaefer@de.ibm.com> 1346345574 +0200
committer Martin Schwidefsky <schwidefsky@de.ibm.com> 1346663646 +0200

s390/mm: fix deadlock in unmap_hugepage_range()

git commit cd2934a3 moved the flush_tlb_range() within
__unmap_hugepage_range() inside the mm->page_table_lock, which
triggered a deadlock in s390 tlb flushing code. __tlb_flush_mm_cond()
also tries to acquire the mm->page_table_lock, but that is not needed
because all callers already have mm->mmap_sem or mm->page_table_lock,
so it can be safely removed to fix the deadlock.

Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>