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mips: add vdso support 

vdso support is available on mips starting with kernel 4.4, see kernel
commit a7f4df4e21 "MIPS: VDSO: Add implementations of gettimeofday()
and clock_gettime()" for details.

In Linux kernel 4.4.0 the mips code returns -ENOSYS in case it can not
handle the vdso call and assumes the libc will call the original
syscall in this case. Handle this case in musl. Currently Linux kernel
4.4.0 handles the following types: CLOCK_REALTIME_COARSE,
CLOCK_MONOTONIC_COARSE, CLOCK_REALTIME and CLOCK_MONOTONIC.
This commit is contained in:
Hauke Mehrtens 2016-01-26 21:26:34 +01:00 committed by Rich Felker
parent a5ba2d7507
commit b0bf52f3e9
1 changed files with 4 additions and 0 deletions
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4
arch/mips/syscall_arch.h
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@ -161,3 +161,7 @@ static inline long __syscall6(long n, long a, long b, long c, long d, long e, lo
if (n == SYS_fstatat) __stat_fix(c);
return r2;
}
#define VDSO_USEFUL
#define VDSO_CGT_SYM "__vdso_clock_gettime"
#define VDSO_CGT_VER "LINUX_2.6"