#ifndef __ASM_GENERIC_POSIX_TYPES_H #define __ASM_GENERIC_POSIX_TYPES_H #include /* * This file is generally used by user-level software, so you need to * be a little careful about namespace pollution etc. * * First the types that are often defined in different ways across * architectures, so that you can override them. */ #ifndef __kernel_long_t typedef long __kernel_long_t; typedef unsigned long __kernel_ulong_t; #endif #ifndef __kernel_ino_t typedef __kernel_ulong_t __kernel_ino_t; #endif #ifndef __kernel_mode_t typedef unsigned int __kernel_mode_t; #endif #ifndef __kernel_pid_t typedef int __kernel_pid_t; #endif #ifndef __kernel_ipc_pid_t typedef int __kernel_ipc_pid_t; #endif #ifndef __kernel_uid_t typedef unsigned int __kernel_uid_t; typedef unsigned int __kernel_gid_t; #endif #ifndef __kernel_suseconds_t typedef __kernel_long_t __kernel_suseconds_t; #endif #ifndef __kernel_daddr_t typedef int __kernel_daddr_t; #endif #ifndef __kernel_uid32_t typedef unsigned int __kernel_uid32_t; typedef unsigned int __kernel_gid32_t; #endif #ifndef __kernel_old_uid_t typedef __kernel_uid_t __kernel_old_uid_t; typedef __kernel_gid_t __kernel_old_gid_t; #endif #ifndef __kernel_old_dev_t typedef unsigned int __kernel_old_dev_t; #endif /* * Most 32 bit architectures use "unsigned int" size_t, * and all 64 bit architectures use "unsigned long" size_t. */ #ifndef __kernel_size_t #if __BITS_PER_LONG != 64 typedef unsigned int __kernel_size_t; typedef int __kernel_ssize_t; typedef int __kernel_ptrdiff_t; #else typedef __kernel_ulong_t __kernel_size_t; typedef __kernel_long_t __kernel_ssize_t; typedef __kernel_long_t __kernel_ptrdiff_t; #endif #endif #ifndef __kernel_fsid_t typedef struct { int val[2]; } __kernel_fsid_t; #endif /* * anything below here should be completely generic */ typedef __kernel_long_t __kernel_off_t; typedef long long __kernel_loff_t; typedef __kernel_long_t __kernel_time_t; typedef __kernel_long_t __kernel_clock_t; typedef int __kernel_timer_t; typedef int __kernel_clockid_t; typedef char * __kernel_caddr_t; typedef unsigned short __kernel_uid16_t; typedef unsigned short __kernel_gid16_t; #endif /* __ASM_GENERIC_POSIX_TYPES_H */ uthor

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author	James Hogan <james.hogan@imgtec.com>	2016-04-22 18:19:17 +0100
committer	Ralf Baechle <ralf@linux-mips.org>	2016-05-13 15:30:25 +0200
commit	1fa405552e33f2169d173cdb7ca0c03e094904f6 (patch)
tree	a67871d91fff562e7074b96d95a0c827408093a5
parent	24e1df664fd3c025664ae0b64a4aec691507959a (diff)

MIPS: cevt-r4k: Dynamically calculate min_delta_ns

Calculate the MIPS clockevent device's min_delta_ns dynamically based on the time it takes to perform the mips_next_event() sequence. Virtualisation in particular makes the current fixed min_delta of 0x300 inappropriate under some circumstances, as the CP0_Count and CP0_Compare registers may be being emulated by the hypervisor, and the frequency may not correspond directly to the CPU frequency. We actually use twice the median of multiple 75th percentiles of multiple measurements of how long the mips_next_event() sequence takes, in order to fairly efficiently eliminate outliers due to unexpected hypervisor latency (which would need handling with retries when it occurs during normal operation anyway). Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/13176/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>