[Minios-devel] [UNIKRAFT PATCH v4 9/9] plat/linuxu: Correct timeout calculation for ukplat_lcpu_halt_to()

[Florian Schmidt <florian.schmidt@xxxxxxxxx>]

From: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>

time_block_until() in plat/linuxu/lcpu.c was passing the
until value directly as timeout value for the underlying
pselect6 system call. This fix substracts the current
value from the monotonic clock to retrieve the actual
timeout value.

Signed-off-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 plat/linuxu/lcpu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/plat/linuxu/lcpu.c b/plat/linuxu/lcpu.c
index afb1d7e..ee8baf1 100644
--- a/plat/linuxu/lcpu.c
+++ b/plat/linuxu/lcpu.c
@@ -60,7 +60,12 @@ void halt(void)
 void time_block_until(__snsec until)
 {
        struct timespec timeout;
+       __nsec now = ukplat_monotonic_clock();
 
+       if (until < 0 || (__nsec) until < now)
+               return; /* timeout expired already */
+
+       until -= now;
        timeout.tv_sec  = until / ukarch_time_sec_to_nsec(1);
        timeout.tv_nsec = until % ukarch_time_sec_to_nsec(1);
 
-- 
2.18.0


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