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authorAlexandre Ghiti <aghiti@upmem.com>2018-12-10 06:21:46 +0000
committerPalmer Dabbelt <palmer@sifive.com>2019-01-25 10:50:53 -0800
commitae662eec8a515ab550524e04c793b5ddf1aae3a1 (patch)
tree06913ca3f17b61d32c612392bac28ef885ee247f /arch/riscv
parentriscv: fixup max_low_pfn with PFN_DOWN. (diff)
downloadlinux-dev-ae662eec8a515ab550524e04c793b5ddf1aae3a1.tar.xz
linux-dev-ae662eec8a515ab550524e04c793b5ddf1aae3a1.zip
riscv: Adjust mmap base address at a third of task size
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>
Diffstat (limited to 'arch/riscv')
-rw-r--r--arch/riscv/include/asm/processor.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 0531f49af5c3..ce70bceb8872 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