I've a structure declaration and definition in header file header.h as:
#include <linux/slab.h>
struct hello{
int a;
char b;
};
extern struct hello *hello;
In file1.c I've:
#include<header.h>
struct hello *hello;
hello=kmalloc(sizeof(struct hello), __GFP_REPEAT);
kfree(hello); //just to check later if 'hello' -
hello=NULL; //-is initialized or not.
In file2.c I've:
#include<header.h>
The struct variable hello is used in file1.c and file2.c.
But while compiling I get an error:
file1.c:3:1 error: type defaults to 'int' in declaration of 'hello' [-Werror=implicit-int]
file1.c:4:1 error: conflicting types for 'hello'
file1.c:3:16 note: previous declaration of 'hello' was here
extern struct hello *hello;
I've never used variable definition in header file. Searched online and got this from few sources. Unable to find what is wrong. A lot of other errors are there after this which originates due to the mentioned error.
Is this:
hello=kmalloc(sizeof(struct hello), __GFP_REPEAT);
really at file-level scope like that? You can't have code like that outside a function in C, but I would expect a different error message.
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