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| author | Tobias Huschle <huschle@linux.ibm.com> | 2024-08-12 13:39:27 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2024-08-29 22:56:34 +0200 |
| commit | 2c6c9ccc76434d5609300aa578a4737e1686b320 (patch) | |
| tree | 12d5ebc7d5b121569eb3617549a844b188a595de /drivers/s390/char/sclp_early.c | |
| parent | 324db0faf8e1cbfde7a033e77f674f2bb819b54e (diff) | |
| download | lwn-2c6c9ccc76434d5609300aa578a4737e1686b320.tar.gz lwn-2c6c9ccc76434d5609300aa578a4737e1686b320.zip | |
s390/wti: Introduce infrastructure for warning track interrupt
The warning-track interrupt (wti) provides a notification that the
receiving CPU will be pre-empted from its physical CPU within a short
time frame. This time frame is called grace period and depends on the
machine type. Giving up the CPU on time may prevent a task to get stuck
while holding a resource.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Reviewed-by: Mete Durlu <meted@linux.ibm.com>
Signed-off-by: Tobias Huschle <huschle@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'drivers/s390/char/sclp_early.c')
| -rw-r--r-- | drivers/s390/char/sclp_early.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_early.c b/drivers/s390/char/sclp_early.c index 07df04af82f2..29156455970e 100644 --- a/drivers/s390/char/sclp_early.c +++ b/drivers/s390/char/sclp_early.c @@ -44,6 +44,7 @@ static void __init sclp_early_facilities_detect(void) sclp.has_ibs = !!(sccb->fac117 & 0x20); sclp.has_gisaf = !!(sccb->fac118 & 0x08); sclp.has_hvs = !!(sccb->fac119 & 0x80); + sclp.has_wti = !!(sccb->fac119 & 0x40); sclp.has_kss = !!(sccb->fac98 & 0x01); sclp.has_aisii = !!(sccb->fac118 & 0x40); sclp.has_aeni = !!(sccb->fac118 & 0x20); |