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powerpc/mm/radix: Fix always false comparison against MMU_NO_CONTEXT

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In some of the radix TLB flush routines, we use a local to store the
mm->context.id, AKA the PID.

Currently we use an int, but the PID is unsigned long, so large values
of PID will be truncated. In particular MMU_NO_CONTEXT is -1, which
means all our comparisons against that value can never be true.

This means we'll issue TLB flushes when we shouldn't on radix enabled
machines.

Fix it by using an unsigned long for the local. Discovered by Coverity.

Fixes: 1a472c9dba ("powerpc/mm/radix: Add tlbflush routines")
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Balbir Singh <bsingharora@gmail.com>
[mpe: Write change log]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2016-06-02 15:14:48 +05:30 committed by Michael Ellerman
parent b3c0a4dab7
commit 9690c15742
1 changed files with 4 additions and 4 deletions
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8
arch/powerpc/mm/tlb-radix.c
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@ -117,7 +117,7 @@ static inline void _tlbie_va(unsigned long va, unsigned long pid,
*/
void radix__local_flush_tlb_mm(struct mm_struct *mm)
{
unsigned int pid;
unsigned long pid;
preempt_disable();
pid = mm->context.id;
@ -130,7 +130,7 @@ EXPORT_SYMBOL(radix__local_flush_tlb_mm);
void radix___local_flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
unsigned long ap, int nid)
{
unsigned int pid;
unsigned long pid;
preempt_disable();
pid = mm ? mm->context.id : 0;
@ -160,7 +160,7 @@ static int mm_is_core_local(struct mm_struct *mm)
void radix__flush_tlb_mm(struct mm_struct *mm)
{
unsigned int pid;
unsigned long pid;
preempt_disable();
pid = mm->context.id;
@ -185,7 +185,7 @@ EXPORT_SYMBOL(radix__flush_tlb_mm);
void radix___flush_tlb_page(struct mm_struct *mm, unsigned long vmaddr,
unsigned long ap, int nid)
{
unsigned int pid;
unsigned long pid;
preempt_disable();
pid = mm ? mm->context.id : 0;