44 lines
1.3 KiB
Plaintext
44 lines
1.3 KiB
Plaintext
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From: Jeff Mahoney <jeffm@suse.com>
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Subject: [PATCH] s390: Define FREE_PTE_NR
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Patch-mainline: Never, unless FREE_PTE_NR is used in generic code
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Commit ba8a9229ab9e80278c28ad68b15053f65b2b0a7c from
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Martin Schwidefsky <schwidefsky@de.ibm.com> removed the
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#include <asm-generic/tlb.h> from asm-s390/tlb.h when he defined the
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s390-specific TLB operations.
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FREE_PTR_NR is generally an internal-only value, but our unmap_vmas-lat
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patch uses it to make smarter decisions about dumping PTEs in chunks.
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This patch restores the generic value in asm-s390/tlb.h. Since it's only
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used for an optimization, this should be safe.
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Signed-off-by: Jeff Mahoney <jeffm@suse.com>
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---
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arch/s390/include/asm/tlb.h | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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--- a/arch/s390/include/asm/tlb.h
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+++ b/arch/s390/include/asm/tlb.h
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@@ -34,6 +34,19 @@
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#define TLB_NR_PTRS 508
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#endif
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+/* Lifted from asm-generic/tlb.h; Is used by patches.suse/unmap_vmas-lat */
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+/*
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+ * For UP we don't need to worry about TLB flush
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+ * and page free order so much..
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+ */
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+#ifdef CONFIG_SMP
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+ #define FREE_PTE_NR 506
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+ #define tlb_fast_mode(tlb) ((tlb)->nr == ~0U)
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+#else
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+ #define FREE_PTE_NR 1
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+ #define tlb_fast_mode(tlb) 1
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+#endif
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+
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struct mmu_gather {
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struct mm_struct *mm;
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unsigned int fullmm;
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