如何在内核源代码中使用函数？

Question

I need to use the function void clflush_cache_range(void *vaddr, unsigned int size) implemented in arch/x86/mm/pageattr.c , but I got two problems.

1. How to identify the corresponding header correctly? I naively searched the symbol and it seems that arch/x86/include/asm/cacheflush.h is the one.

2. How to include the header arch/x86/include/asm/cacheflush.h (if it's the correct one to include)? I tried to include <asm/cacheflush.h> , but it didn't work.

fatal error: asm/cacheflush.h: No such file or directory

Answer 1

Though its not very straightforward way but I would look at other files if they are using the function and try to do the same. For eg look at drivers/iommu/intel-iommu.c on how they use clflush_cache_range()

Refer to http://www.thegeekstuff.com/2013/07/write-linux-kernel-module/ on how to write kernel code.