| From 76813109f0c1de2e27ca7a14b1b5a84601070401 Mon Sep 17 00:00:00 2001 |
| From: Alexandre Ghiti <aghiti@upmem.com> |
| Date: Mon, 10 Dec 2018 06:21:46 +0000 |
| Subject: 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> |
| --- |
| arch/riscv/include/asm/processor.h | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h |
| index 3fe4af8147d2..c23578a37b44 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 |
| -- |
| 2.19.1 |
| |
