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author | Huacai Chen <chenhuacai@loongson.cn> | 2022-05-31 18:04:11 +0800 |
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committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-06-03 20:09:28 +0800 |
commit | 09cfefb7fa70c3af011b0db0a513fd80b2f18abc (patch) | |
tree | fc1a269ecba1f88cabb2e79ee92251612ed6605a /arch/loongarch/mm/maccess.c | |
parent | 803b0fc5c3f2baa6e54978cd576407896f789b08 (diff) | |
download | linux-stable-09cfefb7fa70c3af011b0db0a513fd80b2f18abc.tar.gz linux-stable-09cfefb7fa70c3af011b0db0a513fd80b2f18abc.tar.bz2 linux-stable-09cfefb7fa70c3af011b0db0a513fd80b2f18abc.zip |
LoongArch: Add memory management
Add memory management support for LoongArch, including: cache and tlb
management, page fault handling and ioremap/mmap support.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/mm/maccess.c')
-rw-r--r-- | arch/loongarch/mm/maccess.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/loongarch/mm/maccess.c b/arch/loongarch/mm/maccess.c new file mode 100644 index 000000000000..58173842c6be --- /dev/null +++ b/arch/loongarch/mm/maccess.c @@ -0,0 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include <linux/uaccess.h> +#include <linux/kernel.h> + +bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size) +{ + /* highest bit set means kernel space */ + return (unsigned long)unsafe_src >> (BITS_PER_LONG - 1); +} |