[PATCH 4.4 011/137] powerpc/mm: Fixup preempt underflow with huge pages

From: Greg Kroah-Hartman
Date: Sun Apr 17 2016 - 23:12:51 EST


4.4-stable review patch. If anyone has any objections, please let me know.

------------------

From: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>

commit 08a5bb2921e490939f78f38fd0d02858bb709942 upstream.

hugepd_free() used __get_cpu_var() once. Nothing ensured that the code
accessing the variable did not migrate from one CPU to another and soon
this was noticed by Tiejun Chen in 94b09d755462 ("powerpc/hugetlb:
Replace __get_cpu_var with get_cpu_var"). So we had it fixed.

Christoph Lameter was doing his __get_cpu_var() replaces and forgot
PowerPC. Then he noticed this and sent his fixed up batch again which
got applied as 69111bac42f5 ("powerpc: Replace __get_cpu_var uses").

The careful reader will noticed one little detail: get_cpu_var() got
replaced with this_cpu_ptr(). So now we have a put_cpu_var() which does
a preempt_enable() and nothing that does preempt_disable() so we
underflow the preempt counter.

Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
arch/powerpc/mm/hugetlbpage.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -486,13 +486,13 @@ static void hugepd_free(struct mmu_gathe
{
struct hugepd_freelist **batchp;

- batchp = this_cpu_ptr(&hugepd_freelist_cur);
+ batchp = &get_cpu_var(hugepd_freelist_cur);

if (atomic_read(&tlb->mm->mm_users) < 2 ||
cpumask_equal(mm_cpumask(tlb->mm),
cpumask_of(smp_processor_id()))) {
kmem_cache_free(hugepte_cache, hugepte);
- put_cpu_var(hugepd_freelist_cur);
+ put_cpu_var(hugepd_freelist_cur);
return;
}