linux-kernel - [tip: locking/kcsan] sparc32: mm: Reduce allocation size for PMD and PTE tables

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Date:   Tue, 12 May 2020 14:36:59 -0000
From:   "tip-bot2 for Will Deacon" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "David S. Miller" <davem@...emloft.net>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: locking/kcsan] sparc32: mm: Reduce allocation size for PMD and
 PTE tables

The following commit has been merged into the locking/kcsan branch of tip:

Commit-ID:     2443600dc98fdc91661b2e24184f279d1198f8cc
Gitweb:        https://git.kernel.org/tip/2443600dc98fdc91661b2e24184f279d1198f8cc
Author:        Will Deacon <will@...nel.org>
AuthorDate:    Mon, 11 May 2020 21:41:36 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 12 May 2020 11:04:09 +02:00

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.

Signed-off-by: Will Deacon <will@...nel.org>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: "David S. Miller" <davem@...emloft.net>
Link: https://lkml.kernel.org/r/20200511204150.27858-5-will@kernel.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 58ea8e8..7708d01 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 */