linux-kernel - [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables

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Date:   Mon, 11 May 2020 21:41:36 +0100
From:   Will Deacon <will@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     elver@...gle.com, tglx@...utronix.de, paulmck@...nel.org,
        mingo@...nel.org, peterz@...radead.org, will@...nel.org
Subject: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables

Now that the page table allocator can free page table allocations
smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations
to avoid needlessly wasting memory.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
 arch/sparc/include/asm/pgtsrmmu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h
index 58ea8e8c6ee7..7708d015712b 100644
--- a/arch/sparc/include/asm/pgtsrmmu.h
+++ b/arch/sparc/include/asm/pgtsrmmu.h
@@ -17,8 +17,8 @@
 /* Number of contexts is implementation-dependent; 64k is the most we support */
 #define SRMMU_MAX_CONTEXTS	65536
 
-#define SRMMU_PTE_TABLE_SIZE		(PAGE_SIZE)
-#define SRMMU_PMD_TABLE_SIZE		(PAGE_SIZE)
+#define SRMMU_PTE_TABLE_SIZE		(PTRS_PER_PTE*4)
+#define SRMMU_PMD_TABLE_SIZE		(PTRS_PER_PMD*4)
 #define SRMMU_PGD_TABLE_SIZE		(PTRS_PER_PGD*4)
 
 /* Definition of the values in the ET field of PTD's and PTE's */
-- 
2.26.2.645.ge9eca65c58-goog