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0f26922fe5
The datatype __kernel_time_t is u32 on 32bit platform, so its subject to
overflows in the timeval/timespec to cputime conversion.
Currently the following functions are affected:
1. setitimer()
2. timer_create/timer_settime()
3. sys_clock_nanosleep
This can happen on MIPS32 and ARM32 with "Full dynticks CPU time accounting"
enabled, which is required for CONFIG_NO_HZ_FULL.
Enforce u64 conversion to prevent the overflow.
Fixes: 31c1fc8187 ("ARM: Kconfig: allow full nohz CPU accounting")
Signed-off-by: zengtao <prime.zeng@huawei.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Cc: <fweisbec@gmail.com>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/1454384314-154784-1-git-send-email-prime.zeng@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/*
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* Definitions for measuring cputime in nsecs resolution.
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*
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* Based on <arch/ia64/include/asm/cputime.h>
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*
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* Copyright (C) 2007 FUJITSU LIMITED
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* Copyright (C) 2007 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#ifndef _ASM_GENERIC_CPUTIME_NSECS_H
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#define _ASM_GENERIC_CPUTIME_NSECS_H
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#include <linux/math64.h>
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typedef u64 __nocast cputime_t;
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typedef u64 __nocast cputime64_t;
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#define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)
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#define cputime_one_jiffy jiffies_to_cputime(1)
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#define cputime_div(__ct, divisor) div_u64((__force u64)__ct, divisor)
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#define cputime_div_rem(__ct, divisor, remainder) \
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div_u64_rem((__force u64)__ct, divisor, remainder);
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/*
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* Convert cputime <-> jiffies (HZ)
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*/
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#define cputime_to_jiffies(__ct) \
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cputime_div(__ct, NSEC_PER_SEC / HZ)
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#define cputime_to_scaled(__ct) (__ct)
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#define jiffies_to_cputime(__jif) \
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(__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
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#define cputime64_to_jiffies64(__ct) \
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cputime_div(__ct, NSEC_PER_SEC / HZ)
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#define jiffies64_to_cputime64(__jif) \
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(__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))
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/*
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* Convert cputime <-> nanoseconds
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*/
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#define cputime_to_nsecs(__ct) \
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(__force u64)(__ct)
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#define nsecs_to_cputime(__nsecs) \
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(__force cputime_t)(__nsecs)
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/*
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* Convert cputime <-> microseconds
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*/
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#define cputime_to_usecs(__ct) \
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cputime_div(__ct, NSEC_PER_USEC)
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#define usecs_to_cputime(__usecs) \
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(__force cputime_t)((__usecs) * NSEC_PER_USEC)
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#define usecs_to_cputime64(__usecs) \
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(__force cputime64_t)((__usecs) * NSEC_PER_USEC)
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/*
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* Convert cputime <-> seconds
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*/
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#define cputime_to_secs(__ct) \
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cputime_div(__ct, NSEC_PER_SEC)
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#define secs_to_cputime(__secs) \
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(__force cputime_t)((__secs) * NSEC_PER_SEC)
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/*
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* Convert cputime <-> timespec (nsec)
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*/
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static inline cputime_t timespec_to_cputime(const struct timespec *val)
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{
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u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
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return (__force cputime_t) ret;
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}
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static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
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{
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u32 rem;
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val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
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val->tv_nsec = rem;
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}
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/*
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* Convert cputime <-> timeval (msec)
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*/
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static inline cputime_t timeval_to_cputime(const struct timeval *val)
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{
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u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
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val->tv_usec * NSEC_PER_USEC;
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return (__force cputime_t) ret;
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}
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static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
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{
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u32 rem;
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val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
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val->tv_usec = rem / NSEC_PER_USEC;
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}
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/*
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* Convert cputime <-> clock (USER_HZ)
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*/
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#define cputime_to_clock_t(__ct) \
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cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
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#define clock_t_to_cputime(__x) \
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(__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))
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/*
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* Convert cputime64 to clock.
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*/
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#define cputime64_to_clock_t(__ct) \
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cputime_to_clock_t((__force cputime_t)__ct)
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#endif
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