summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include/asm/tlb.h
diff options
context:
space:
mode:
authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2016-10-24 08:50:43 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2016-10-27 21:55:13 +1100
commitbd77c4498616e27d5725b5959d880ce2272fefa9 (patch)
tree0c9b440569016a254614d7b3eb1ce05f57cd920c /arch/powerpc/include/asm/tlb.h
parent39715bf972ed4fee18fe5409609a971fb16b1771 (diff)
downloadblackbird-op-linux-bd77c4498616e27d5725b5959d880ce2272fefa9.tar.gz
blackbird-op-linux-bd77c4498616e27d5725b5959d880ce2272fefa9.zip
powerpc/mm/radix: Use tlbiel only if we ever ran on the current cpu
Before this patch, we used tlbiel, if we ever ran only on this core. That was mostly derived from the nohash usage of the same. But is incorrect, the ISA 3.0 clarifies tlbiel such that: "All TLB entries that have all of the following properties are made invalid on the thread executing the tlbiel instruction" ie. tlbiel only invalidates TLB entries on the current thread. So if the mm has been used on any other thread (aka. cpu) then we must broadcast the invalidate. This bug could lead to invalid TLB entries if a program runs on multiple threads of a core. Hence use tlbiel, if we only ever ran on only the current cpu. Fixes: 1a472c9dba6b ("powerpc/mm/radix: Add tlbflush routines") Cc: stable@vger.kernel.org # v4.7+ Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/tlb.h')
-rw-r--r--arch/powerpc/include/asm/tlb.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/tlb.h b/arch/powerpc/include/asm/tlb.h
index f6f68f73e858..99e1397b71da 100644
--- a/arch/powerpc/include/asm/tlb.h
+++ b/arch/powerpc/include/asm/tlb.h
@@ -52,11 +52,23 @@ static inline int mm_is_core_local(struct mm_struct *mm)
return cpumask_subset(mm_cpumask(mm),
topology_sibling_cpumask(smp_processor_id()));
}
+
+static inline int mm_is_thread_local(struct mm_struct *mm)
+{
+ return cpumask_equal(mm_cpumask(mm),
+ cpumask_of(smp_processor_id()));
+}
+
#else
static inline int mm_is_core_local(struct mm_struct *mm)
{
return 1;
}
+
+static inline int mm_is_thread_local(struct mm_struct *mm)
+{
+ return 1;
+}
#endif
#endif /* __KERNEL__ */
OpenPOWER on IntegriCloud