mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 21:02:19 +00:00
43644679a1
These macros had two bugs: - the type of the mask was not correctly expanded to the full size of the argument being expanded, resulting in possible loss of high bits when mixing types. - the alignment argument was evaluated twice, despite the macro looking like a fancy function (but it really does need to be a macro, since it works on arbitrary integer types) Noticed by Peter Anvin, and with a fix that is a modification of his suggestion (bug noticed by Yinghai Lu). Cc: Peter Anvin <hpa@zytor.com> Cc: Yinghai Lu <yinghai@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
36 lines
913 B
C
36 lines
913 B
C
#ifndef _ASM_X86_PROTO_H
|
|
#define _ASM_X86_PROTO_H
|
|
|
|
#include <asm/ldt.h>
|
|
|
|
/* misc architecture specific prototypes */
|
|
|
|
extern void early_idt_handler(void);
|
|
|
|
extern void system_call(void);
|
|
extern void syscall_init(void);
|
|
|
|
extern void ia32_syscall(void);
|
|
extern void ia32_cstar_target(void);
|
|
extern void ia32_sysenter_target(void);
|
|
|
|
extern void syscall32_cpu_init(void);
|
|
|
|
extern void check_efer(void);
|
|
|
|
extern int reboot_force;
|
|
|
|
long do_arch_prctl(struct task_struct *task, int code, unsigned long addr);
|
|
|
|
/*
|
|
* This looks more complex than it should be. But we need to
|
|
* get the type for the ~ right in round_down (it needs to be
|
|
* as wide as the result!), and we want to evaluate the macro
|
|
* arguments just once each.
|
|
*/
|
|
#define __round_mask(x,y) ((__typeof__(x))((y)-1))
|
|
#define round_up(x,y) ((((x)-1) | __round_mask(x,y))+1)
|
|
#define round_down(x,y) ((x) & ~__round_mask(x,y))
|
|
|
|
#endif /* _ASM_X86_PROTO_H */
|