/usr/arm-linux-androideabi/include/linux/smp.h is in gcc-arm-linux-androideabi 0.20130705.1-0ubuntu9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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****************************************************************************
***
*** This header was automatically generated from a Linux kernel header
*** of the same name, to make information necessary for userspace to
*** call into the kernel available to libc. It contains only constants,
*** structures, and macros generated from the original header, and thus,
*** contains no copyrightable information.
***
*** To edit the content of this header, modify the corresponding
*** source file (e.g. under external/kernel-headers/original/) then
*** run bionic/libc/kernel/tools/update_all.py
***
*** Any manual change here will be lost the next time this script will
*** be run. You've been warned!
***
****************************************************************************
****************************************************************************/
#ifndef __LINUX_SMP_H
#define __LINUX_SMP_H
#define raw_smp_processor_id() 0
#define hard_smp_processor_id() 0
/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
#define smp_call_function(func,info,retry,wait) (up_smp_call_function())
#define on_each_cpu(func,info,retry,wait) ({ local_irq_disable(); func(info); local_irq_enable(); 0; })
#define num_booting_cpus() 1
#define smp_prepare_boot_cpu() do {} while (0)
/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
#define smp_processor_id() raw_smp_processor_id()
#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
#define put_cpu() preempt_enable()
#define put_cpu_no_resched() preempt_enable_no_resched()
/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
#endif
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