* Re: [glibc/google/grte/v5-2.27/master] Fix sense of a test in the static-linking version of ppc get_clockfreq
[not found] <20190517192546.22134.qmail@sourceware.org>
@ 2019-05-18 4:35 ` Carlos O'Donell
2019-05-29 13:33 ` Adhemerval Zanella
0 siblings, 1 reply; 3+ messages in thread
From: Carlos O'Donell @ 2019-05-18 4:35 UTC (permalink / raw)
To: Stan Shebs, GNU C Library, Adhemerval Zanella
On 5/17/19 2:25 PM, Stan Shebs wrote:
> https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4791e4f773d060c1a37b27aac5b03cdfa9327afc
>
> commit 4791e4f773d060c1a37b27aac5b03cdfa9327afc
> Author: Stan Shebs <stanshebs@google.com>
> Date: Fri May 17 12:25:19 2019 -0700
>
> Fix sense of a test in the static-linking version of ppc get_clockfreq
>
Stan,
This looks like a fix that should go on master?
Cheers,
Carlos.
> Diff:
> ---
> sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
> index 8821218..4e4c2a2 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
> +++ b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
> @@ -59,7 +59,7 @@ __get_clockfreq (void)
> timebase : 33333333
> We search for this line and convert the number into an integer. */
> int fd = __open_nocancel ("/proc/cpuinfo", O_RDONLY);
> - if (__glibc_likely (fd != -1))
> + if (__glibc_unlikely (fd == -1))
> return result;
>
> /* The timebase will be in the 1st 1024 bytes for systems with up
>
--
Cheers,
Carlos.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [glibc/google/grte/v5-2.27/master] Fix sense of a test in the static-linking version of ppc get_clockfreq
2019-05-18 4:35 ` [glibc/google/grte/v5-2.27/master] Fix sense of a test in the static-linking version of ppc get_clockfreq Carlos O'Donell
@ 2019-05-29 13:33 ` Adhemerval Zanella
2019-05-29 15:09 ` Adhemerval Zanella
0 siblings, 1 reply; 3+ messages in thread
From: Adhemerval Zanella @ 2019-05-29 13:33 UTC (permalink / raw)
To: Carlos O'Donell, Stan Shebs, GNU C Library
On 18/05/2019 01:35, Carlos O'Donell wrote:
> On 5/17/19 2:25 PM, Stan Shebs wrote:
>> https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4791e4f773d060c1a37b27aac5b03cdfa9327afc
>>
>> commit 4791e4f773d060c1a37b27aac5b03cdfa9327afc
>> Author: Stan Shebs <stanshebs@google.com>
>> Date: Fri May 17 12:25:19 2019 -0700
>>
>> Fix sense of a test in the static-linking version of ppc get_clockfreq
>>
>
> Stan,
>
> This looks like a fix that should go on master?
>
> Cheers,
> Carlos.
>
This in fact not required due 38cc11daa43b1, 77b6f553477, and 6e8ba7fd574.
The __get_clock freq in fact is not really used in any recent kernel we
support now, so its had been dead code for some time.
>
>> Diff:
>> ---
>> sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
>> index 8821218..4e4c2a2 100644
>> --- a/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
>> +++ b/sysdeps/unix/sysv/linux/powerpc/get_clockfreq.c
>> @@ -59,7 +59,7 @@ __get_clock freq (void)
>> timebase : 33333333
>> We search for this line and convert the number into an integer. */
>> int fd = __open_nocancel ("/proc/cpuinfo", O_RDONLY);
>> - if (__glibc_likely (fd != -1))
>> + if (__glibc_unlikely (fd == -1))
>> return result;
>>
>> /* The timebase will be in the 1st 1024 bytes for systems with up
>>
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [glibc/google/grte/v5-2.27/master] Fix sense of a test in the static-linking version of ppc get_clockfreq
2019-05-29 13:33 ` Adhemerval Zanella
@ 2019-05-29 15:09 ` Adhemerval Zanella
0 siblings, 0 replies; 3+ messages in thread
From: Adhemerval Zanella @ 2019-05-29 15:09 UTC (permalink / raw)
To: Carlos O'Donell, Stan Shebs, GNU C Library
On 29/05/2019 10:33, Adhemerval Zanella wrote:
>
>
> On 18/05/2019 01:35, Carlos O'Donell wrote:
>> On 5/17/19 2:25 PM, Stan Shebs wrote:
>>> https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=4791e4f773d060c1a37b27aac5b03cdfa9327afc
>>>
>>> commit 4791e4f773d060c1a37b27aac5b03cdfa9327afc
>>> Author: Stan Shebs <stanshebs@google.com>
>>> Date: Fri May 17 12:25:19 2019 -0700
>>>
>>> Fix sense of a test in the static-linking version of ppc get_clockfreq
>>>
>>
>> Stan,
>>
>> This looks like a fix that should go on master?
>>
>> Cheers,
>> Carlos.
>>
>
> This in fact not required due 38cc11daa43b1, 77b6f553477, and 6e8ba7fd574.
> The __get_clock freq in fact is not really used in any recent kernel we
> support now, so its had been dead code for some time.
>
Tulio has raised to my attention that get_timebase_freq.c has a similar issue.
Taking in consideration that BZ#19767 is at least fixed for powerpc, I think
best action would be to just remove INTERNAL_VSYSCALL_NO_SYSCALL_FALLBACK,
check vdso pointer availability (assuming a kernel might be build without
vDSO support) and fallback to read /proc/cpuinfo in the case.
Something like:
uint64_t
__get_timebase_freq (void)
{
hp_timing_t result = 0L;
{
/* The vDSO does not fail (it clear cr0.so on returning). */
__typeof (__vdso_get_tbfreq) vdsop = __vdso_get_tbfreq;
PTR_DEMANGLE (vdsop)
if (vdsop != NULL)
return vdsop ();
/* Fallback. */
}
I also think mostly of INTERNAL_VSYSCALL_CALL_TYPE from powerpc sysdep could
just be removed since currently all vDSO symbol do not fail (so there is no
need to actually check cr0.so value).
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-05-29 15:10 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <20190517192546.22134.qmail@sourceware.org>
2019-05-18 4:35 ` [glibc/google/grte/v5-2.27/master] Fix sense of a test in the static-linking version of ppc get_clockfreq Carlos O'Donell
2019-05-29 13:33 ` Adhemerval Zanella
2019-05-29 15:09 ` Adhemerval Zanella
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).