[Bug runtime/4569] _stp_gettimeofday_ns doesn't work for some archs

[Bug runtime/4569] _stp_gettimeofday_ns doesn't work for some archs

[wcohen at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=4569

--- Comment #1 from William Cohen <wcohen at redhat dot com> 2012-11-20 22:00:16 UTC ---
It appears that some recent changes in the 3.6 linux kernel provide something
other than 0 for get_cycles():

http://lxr.linux.no/#linux+v3.6/arch/arm/include/asm/timex.h

#ifdef ARCH_HAS_READ_CURRENT_TIMER
#define get_cycles()    ({ cycles_t c; read_current_timer(&c) ? 0 : c; })
#else
#define get_cycles()    (0)
#endif



In theory this should allow allow gtod and OVERLOAD2 test to work. The Fedora
arm 18 kernel should have the correct CONF* set, but with the  Linux wecf18arm
3.6.3-3.fc18.armv7hl.tegra still seeing:

FAIL: gtod (0)
FAIL: OVERLOAD2 no expected error

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[Bug runtime/4569] _stp_gettimeofday_ns doesn't work for some archs

[jistone at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=4569

--- Comment #2 from Josh Stone <jistone at redhat dot com> 2012-11-20 22:39:43 UTC ---
(In reply to comment #1)
> In theory this should allow allow gtod and OVERLOAD2 test to work. The Fedora
> arm 18 kernel should have the correct CONF* set, but with the  Linux wecf18arm
> 3.6.3-3.fc18.armv7hl.tegra still seeing:
> 
> FAIL: gtod (0)
> FAIL: OVERLOAD2 no expected error

Perhaps try testing read_current_timer() directly to see what's returned?  The
implementation starts with a check that may return -ENXIO.  The CONF settings
only tell you what's in the kernel build, but at runtime it might still not
find supported timer hardware.

Also, _stp_gettimeofday_ns has a kludge for arm that will need to be adapted
for when get_cycles appears to work (i.e. when it's returning non-zero).

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[Bug runtime/4569] _stp_gettimeofday_ns doesn't work for some archs

[hunt at redhat dot com]

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http://sourceware.org/bugzilla/show_bug.cgi?id=4569

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