Hi,
Can someone explain the "fastcall" directive used in Linux kernel? When I called a
kernel function with this directive, I got a "general protection fault" error. But after I removed the "fastcall"
directive, the problem disappeared. I checked linkage.h and found that fastcall directive essentially tells the compiler
to put the first arguments in registers. But I don't know why that causes the protection failure.
Here is the full story:
I tried to call the following code in a kernel module:
error = do_path_lookup(AT_FDCWD, "/etc/profile.d/glib2.csh",
LOOKUP_PARENT, &nd);
But do_path_lookup() caused the "general protection fault: 0000 [#1]"
kernel error.
After I removed the "fastcall" from the declaration of do_path_lookup(),
I successfully called do_path_lookup() in my kernel module.
Can someone explain it?
Thanks,
