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The SHIFT_PERCPU_PTR() returns a pointer used by a number of functions that expect the pointer to be __percpu annotated (sparse address space 3). Adding __percpu to this makes the following sparse warnings go away. Note, this then creates the problem the __percup is marked as noderef, which may need removing for some of the internal functions, or to remove other warnings. mm/vmstat.c:385:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:385:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:385:13: got signed char * mm/vmstat.c:385:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:385:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:385:13: got signed char * mm/vmstat.c:385:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:385:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:385:13: got signed char * mm/vmstat.c:385:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:385:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:385:13: got signed char * mm/vmstat.c:401:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:401:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:401:13: got signed char * mm/vmstat.c:401:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:401:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:401:13: got signed char * mm/vmstat.c:401:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:401:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:401:13: got signed char * mm/vmstat.c:401:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:401:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:401:13: got signed char * mm/vmstat.c:429:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:429:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:429:13: got signed char * mm/vmstat.c:429:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:429:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:429:13: got signed char * mm/vmstat.c:429:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:429:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:429:13: got signed char * mm/vmstat.c:429:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:429:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:429:13: got signed char * mm/vmstat.c:445:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:445:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:445:13: got signed char * mm/vmstat.c:445:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:445:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:445:13: got signed char * mm/vmstat.c:445:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:445:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:445:13: got signed char * mm/vmstat.c:445:13: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:445:13: expected signed char [noderef] [usertype] <asn:3> *__p mm/vmstat.c:445:13: got signed char * mm/vmstat.c:763:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:763:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:763:29: got signed char * mm/vmstat.c:763:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:763:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:763:29: got signed char * mm/vmstat.c:763:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:763:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:763:29: got signed char * mm/vmstat.c:763:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:763:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:763:29: got signed char * mm/vmstat.c:825:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:825:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:825:29: got signed char * mm/vmstat.c:825:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:825:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:825:29: got signed char * mm/vmstat.c:825:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:825:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:825:29: got signed char * mm/vmstat.c:825:29: warning: incorrect type in initializer (different address spaces) mm/vmstat.c:825:29: expected signed char [noderef] <asn:3> *__p mm/vmstat.c:825:29: got signed char * Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk> Signed-off-by: Dennis Zhou <dennis@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.