From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Thu, 4 Dec 2014 10:07:19 +0000 (+0100)
Subject: s390/mm: fix memory leak of ptlock in pmd_free_tlb
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9de45f736f21655400fd56b85bfbaf507cc2959d;p=linux-beck.git

s390/mm: fix memory leak of ptlock in pmd_free_tlb

The pmd_free_tlb function fails to call pgtable_pmd_page_dtor.
Without the call the ptlock for the pmd tables will not be freed.
Add the missing call.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index 572c59949004..06d8741ad6f4 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -121,6 +121,7 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 #ifdef CONFIG_64BIT
 	if (tlb->mm->context.asce_limit <= (1UL << 31))
 		return;
+	pgtable_pmd_page_dtor(virt_to_page(pmd));
 	tlb_remove_table(tlb, pmd);
 #endif
 }