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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2017-04-24 19:19:10 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2017-06-12 17:25:54 +0300
commit1aea9b3f921003f0880f0676ae85d87c9f1cb4a2 (patch)
tree32b9b3100e16b50d515cd05cf249df3f6fb0b779 /arch/s390/include/asm/tlb.h
parent16ddcc34b8bde5d9257114a16565fac73237bef9 (diff)
downloadlinux-1aea9b3f921003f0880f0676ae85d87c9f1cb4a2.tar.xz
s390/mm: implement 5 level pages tables
Add the logic to upgrade the page table for a 64-bit process to five levels. This increases the TASK_SIZE from 8PB to 16EB-4K. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/tlb.h')
-rw-r--r--arch/s390/include/asm/tlb.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h
index 853b2a3d8dee..7317b3108a88 100644
--- a/arch/s390/include/asm/tlb.h
+++ b/arch/s390/include/asm/tlb.h
@@ -137,6 +137,21 @@ static inline void pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
}
/*
+ * p4d_free_tlb frees a pud table and clears the CRSTE for the
+ * region second table entry from the tlb.
+ * If the mm uses a four level page table the single p4d is freed
+ * as the pgd. p4d_free_tlb checks the asce_limit against 8PB
+ * to avoid the double free of the p4d in this case.
+ */
+static inline void p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
+ unsigned long address)
+{
+ if (tlb->mm->context.asce_limit <= (1UL << 53))
+ return;
+ tlb_remove_table(tlb, p4d);
+}
+
+/*
* pud_free_tlb frees a pud table and clears the CRSTE for the
* region third table entry from the tlb.
* If the mm uses a three level page table the single pud is freed