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authorOleg Nesterov <oleg@tv-sign.ru>2007-02-28 20:13:49 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-01 14:53:39 -0800
commit34bbd704051c9d053d69e90569a3a2365f4c7b50 (patch)
treef5fb6f3941cd09be0fb92ae80f9759ad64fca709 /drivers/isdn
parent48dba8ab9b93c3b6b57946bd45ae013402b0b054 (diff)
[PATCH] adapt page_lock_anon_vma() to PREEMPT_RCU
page_lock_anon_vma() uses spin_lock() to block RCU. This doesn't work with PREEMPT_RCU, we have to do rcu_read_lock() explicitely. Otherwise, it is theoretically possible that slab returns anon_vma's memory to the system before we do spin_unlock(&anon_vma->lock). [ Hugh points out that this only matters for PREEMPT_RCU, which isn't merged yet, and may never be. Regardless, this patch is conceptually the right thing to do, even if it doesn't matter at this point. - Linus ] Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Christoph Lameter <clameter@engr.sgi.com> Acked-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/isdn')
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