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Commit 53c99bd6 authored by Martin Schwidefsky's avatar Martin Schwidefsky
Browse files

init: add arch_call_rest_init to allow stack switching 



With CONFIG_VMAP_STACK=y the kernel stack of all tasks should be
allocated in the vmalloc space. The initial stack used for all
the early init code is in the init_thread_union. To be able to
switch from this early stack to a properly allocated stack
from vmalloc the architecture needs a switch-over point.

Introduce the arch_call_rest_init() function with a weak definition
in init/main.c with the only purpose to call rest_init() from the
end of start_kernel(). The architecture override can then do the
necessary magic to switch to the new vmalloc'ed stack.

Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 00e9e664

include/linux/start_kernel.h

+2 −0
Original line number Diff line number Diff line
@@ -9,5 +9,7 @@ 
   up something else. */



extern asmlinkage void __init start_kernel(void);

extern void __init arch_call_rest_init(void);

extern void __ref rest_init(void);



#endif /* _LINUX_START_KERNEL_H */

init/main.c

+7 −2
Original line number Diff line number Diff line
@@ -394,7 +394,7 @@ static void __init setup_command_line(char *command_line) 


static __initdata DECLARE_COMPLETION(kthreadd_done);



static noinline void __ref rest_init(void)

noinline void __ref rest_init(void)

{

	struct task_struct *tsk;

	int pid;
@@ -528,6 +528,11 @@ static void __init mm_init(void) 
	pti_init();

}



void __init __weak arch_call_rest_init(void)

{

	rest_init();

}



asmlinkage __visible void __init start_kernel(void)

{

	char *command_line;
@@ -736,7 +741,7 @@ asmlinkage __visible void __init start_kernel(void) 
	}



	/* Do the rest non-__init'ed, we're now alive */

	rest_init();

	arch_call_rest_init();

}



/* Call all constructor functions linked into the kernel. */