Commit 8f8d9fe6 authored by ZhangPeng's avatar ZhangPeng Committed by Peng Zhang
Browse files

mm/userswap: provide cpu info in userfault msg 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8KESX


CVE: NA

--------------------------------

The uffd_msg.reserved3 field is used to transfer the CPU information of
the PF.

Signed-off-by: default avatarZhangPeng <zhangpeng362@huawei.com>
parent 0214feb8

fs/userfaultfd.c

+3 −0
Original line number Diff line number Diff line
@@ -269,6 +269,9 @@ static inline struct uffd_msg userfault_msg(unsigned long address, 
		msg.arg.pagefault.flags |= UFFD_PAGEFAULT_FLAG_MINOR;

	if (features & UFFD_FEATURE_THREAD_ID)

		msg.arg.pagefault.feat.ptid = task_pid_vnr(current);

#ifdef CONFIG_USERSWAP

	uswap_get_cpu_id(reason, &msg);

#endif

	return msg;

}

include/linux/userswap.h

+6 −0
Original line number Diff line number Diff line
@@ -50,5 +50,11 @@ static inline bool uswap_check_copy(struct vm_area_struct *vma, 
	return true;

}



static inline void uswap_get_cpu_id(unsigned long reason, struct uffd_msg *msg)

{

	if (reason & VM_USWAP)

		msg->reserved3 = smp_processor_id();

}



#endif /* CONFIG_USERSWAP */

#endif /* _LINUX_USERSWAP_H */