4.20-stable review patch. If anyone has any objections, please let me know.
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[ 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 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