From: Alexandre Ghiti <aghiti@upmem.com>
Date: Mon, 10 Dec 2018 06:21:46 +0000 (+0000)
Subject: riscv: Adjust mmap base address at a third of task size
X-Git-Tag: v4.19.29~133
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dc04a00b3cbb89c96e3b5d5ef7b7cb75d1d747ec;p=platform%2Fkernel%2Flinux-rpi.git

riscv: Adjust mmap base address at a third of task size

[ Upstream commit ae662eec8a515ab550524e04c793b5ddf1aae3a1 ]

This ratio is the most used among all other architectures and make
icache_hygiene libhugetlbfs test pass: this test mmap lots of
hugepages whose addresses, without this patch, reach the end of
the process user address space.

Signed-off-by: Alexandre Ghiti <aghiti@upmem.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 3fe4af8..c23578a 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -22,7 +22,7 @@
  * This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
  */
-#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE >> 1)
+#define TASK_UNMAPPED_BASE	PAGE_ALIGN(TASK_SIZE / 3)
 
 #define STACK_TOP		TASK_SIZE
 #define STACK_TOP_MAX		STACK_TOP