problem in mmap b/w user and kernel space

[vijeshreddy]

I am trying to mmap some memory b/w user space and kernel space so that I can use it as a shared memory area.

I tried a sample code from internet in which the following functions were used.

1. mem_map_reserve(page);

2. remap_page_range(start, page, PAGE_SIZE, PAGE_SHARED))

and  an include file #include <linux/wrapper.h> was used.

If I compile the same code for imx6 i am getting <linux/wrapper.h> - no such file  error , if I am not including the file - i am getting an error - implicit declaration of  remap_page_range()

Please let me know which include i have to use to eliminate the error or is there any better way to mmap some memory between user and kernel space.

Thanks in advance.

Vijesh.

[igorpadykov]

Hi Vijesh

what android release used in the case. In general one can try to rebuild from scratch,

to avoid possibilty for using old headers. Also similar issues one can find by googling, like
mmap causes compile errors on r15c (unknown identifier) · Issue #477 · android-ndk/ndk · GitHub 

Best regards
igor
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[vijeshreddy]

I am using linux 4.1.18-i.MX6-PD15.3.0

[igorpadykov]

this is not supported by nxp, please try nxp official releases described on

http://www.nxp.com/products/software-and-tools/software-development-tools/i.mx-software-and-tools/i....

Best regards
igor