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To improve performance, map the memory as weakly-ordered non-cacheable normal memory. Signed-off-by: Qingfang Deng --- arch/riscv/include/asm/io.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/arch/riscv/include/asm/io.h b/arch/riscv/include/asm/io.h index 1c5c641075d2..582503e0f508 100644 --- a/arch/riscv/include/asm/io.h +++ b/arch/riscv/include/asm/io.h @@ -133,6 +133,14 @@ __io_writes_outs(outs, u64, q, __io_pbr(), __io_paw()) #define outsq(addr, buffer, count) __outsq(PCI_IOBASE + (addr), buffer, co= unt) #endif =20 +#ifdef CONFIG_MMU +#define ioremap_wc(addr, size) \ + ioremap_prot((addr), (size), \ + (_PAGE_KERNEL & ~_PAGE_MTMASK) | _PAGE_NOCACHE) + +#define ioremap_wt ioremap_wc +#endif + #include =20 #ifdef CONFIG_MMU --=20 2.34.1