Re: [PATCH] hppa: Wire up cacheflush syscall

[Sam James <sam@gentoo.org>]

Helge Deller <deller@gmx.de> writes:

> On 7/8/24 18:00, Andreas K. Huettel wrote:
>> Am Montag, 8. Juli 2024, 10:58:35 CEST schrieb Helge Deller:
>>> On 7/8/24 10:13, Florian Weimer wrote:
>>>> * Helge Deller:
>>>>
>>>>> diff --git a/sysdeps/unix/sysv/linux/hppa/sys/cachectl.h b/sysdeps/unix/sysv/linux/hppa/sys/cachectl.h
>>>>> new file mode 100644
>>>>> index 0000000000..16e47d1329
>>>>> --- /dev/null
>>>>> +++ b/sysdeps/unix/sysv/linux/hppa/sys/cachectl.h
>>>>> @@ -0,0 +1,36 @@
>>>>
>>>>> +#ifndef _SYS_CACHECTL_H
>>>>> +#define _SYS_CACHECTL_H 1
>>>>> +
>>>>> +#include <features.h>
>>>>> +
>>>>> +/* Get the kernel definition for the op bits.  */
>>>>> +#include <asm/cachectl.h>
>>>>
>>>> This makes this header (<sys/cachectl.h>) unusable with older kernel
>>>> headers.  I think it also results in a test failure with older headers.
>>>> Is this a problem?
>>>
>>> hppa lives in debian unstable, so basically you should always use
>>> the latest kernel & kernel headers when upgrading glibc.
>>
>> Ahem.
>> https://www.gentoo.org/downloads/#hppa
>
> Sure. But I didn't mentioned it, because Gentoo usually uses a
> more recent kernel than Debian, right?
>

In this instance, I wonder if we should do the extra checks. The kernel
instability because of the cache / TLB issues means at least one of our
machines runs an older kernel for now. (Dave's latest patches seem to
help a lot there, but you get the point.)

thanks,
sam