From: David Hildenbrand <david@redhat.com>
To: Janosch Frank <frankja@linux.ibm.com>, kvm@vger.kernel.org
Cc: cohuck@redhat.com, linux-s390@vger.kernel.org,
imbrenda@linux.ibm.com, thuth@redhat.com
Subject: Re: [kvm-unit-tests PATCH 2/4] lib: s390x: sclp: Extend feature probing
Date: Tue, 11 May 2021 13:43:36 +0200 [thread overview]
Message-ID: <b0db681f-bfe3-5cf3-53f8-651bba04a5c5@redhat.com> (raw)
In-Reply-To: <20210510150015.11119-3-frankja@linux.ibm.com>
On 10.05.21 17:00, Janosch Frank wrote:
> Lets grab more of the feature bits from SCLP read info so we can use
> them in the cpumodel tests.
>
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
> Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
> ---
> lib/s390x/sclp.c | 20 ++++++++++++++++++++
> lib/s390x/sclp.h | 38 +++++++++++++++++++++++++++++++++++---
> 2 files changed, 55 insertions(+), 3 deletions(-)
>
> diff --git a/lib/s390x/sclp.c b/lib/s390x/sclp.c
> index f11c2035..f25cfdb2 100644
> --- a/lib/s390x/sclp.c
> +++ b/lib/s390x/sclp.c
> @@ -129,6 +129,13 @@ CPUEntry *sclp_get_cpu_entries(void)
> return (CPUEntry *)(_read_info + read_info->offset_cpu);
> }
>
> +static bool sclp_feat_check(int byte, int mask)
> +{
> + uint8_t *rib = (uint8_t *)read_info;
> +
> + return !!(rib[byte] & mask);
> +}
Instead of a mask, I'd just check for bit (offset) numbers within the byte.
static bool sclp_feat_check(int byte, int bit)
{
uint8_t *rib = (uint8_t *)read_info;
return !!(rib[byte] & (0x80 >> bit));
}
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-05-11 11:43 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-10 15:00 [kvm-unit-tests PATCH 0/4] s390x: cpumodel: Add sclp checks Janosch Frank
2021-05-10 15:00 ` [kvm-unit-tests PATCH 1/4] s390x: sclp: Only fetch read info byte 134 if cpu entries are above it Janosch Frank
2021-05-11 11:39 ` David Hildenbrand
2021-05-11 16:32 ` Cornelia Huck
2021-05-10 15:00 ` [kvm-unit-tests PATCH 2/4] lib: s390x: sclp: Extend feature probing Janosch Frank
2021-05-11 11:43 ` David Hildenbrand [this message]
2021-05-11 14:41 ` Claudio Imbrenda
2021-05-11 15:38 ` David Hildenbrand
2021-05-11 15:46 ` Claudio Imbrenda
2021-05-11 16:36 ` Cornelia Huck
2021-05-10 15:00 ` [kvm-unit-tests PATCH 3/4] s390x: cpumodel: FMT4 SCLP test Janosch Frank
2021-05-11 11:45 ` David Hildenbrand
2021-05-11 14:42 ` Claudio Imbrenda
2021-05-10 15:00 ` [kvm-unit-tests PATCH 4/4] s390x: cpumodel: FMT2 SCLP implies test Janosch Frank
2021-05-11 11:46 ` David Hildenbrand
2021-05-11 14:36 ` Claudio Imbrenda
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