Commit e4026440 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: map vsyscalls early enough 



map vsyscalls early enough. This is important if a __vsyscall_fn
function is used by other kernel code too.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent cdc7957d

arch/x86/kernel/setup_64.c

+2 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <asm/mtrr.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/vsyscall.h>

#include <asm/io.h>

#include <asm/smp.h>

#include <asm/msr.h>
@@ -453,6 +454,7 @@ void __init setup_arch(char **cmdline_p) 
#endif

	reserve_crashkernel();

	paging_init();

	map_vsyscall();



	early_quirks();

arch/x86/kernel/vsyscall_64.c

+1 −2
Original line number Diff line number Diff line
@@ -319,7 +319,7 @@ cpu_vsyscall_notifier(struct notifier_block *n, unsigned long action, void *arg) 
	return NOTIFY_DONE;

}



static void __init map_vsyscall(void)

void __init map_vsyscall(void)

{

	extern char __vsyscall_0;

	unsigned long physaddr_page0 = __pa_symbol(&__vsyscall_0);
@@ -335,7 +335,6 @@ static int __init vsyscall_init(void) 
	BUG_ON((unsigned long) &vtime != VSYSCALL_ADDR(__NR_vtime));

	BUG_ON((VSYSCALL_ADDR(0) != __fix_to_virt(VSYSCALL_FIRST_PAGE)));

	BUG_ON((unsigned long) &vgetcpu != VSYSCALL_ADDR(__NR_vgetcpu));

	map_vsyscall();

#ifdef CONFIG_SYSCTL

	register_sysctl_table(kernel_root_table2);

#endif

include/asm-x86/vsyscall.h

+2 −0
Original line number Diff line number Diff line
@@ -36,6 +36,8 @@ extern volatile unsigned long __jiffies; 
extern int vgetcpu_mode;

extern struct timezone sys_tz;



extern void map_vsyscall(void);



#endif /* __KERNEL__ */



#endif /* _ASM_X86_64_VSYSCALL_H_ */

CRA Git | Maintained and supported by SUSTech CRA and CCSE