From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Thu, 30 Aug 2012 16:52:54 +0000 (+0200)
Subject: s390/mm: fix deadlock in unmap_hugepage_range()
X-Git-Tag: v3.6-rc7~22^2~8
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d5feaea364281a7e9b80b4712e790ab908d61711;p=pandora-kernel.git

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>
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