[PATCH 1/5] cobalt/syscall: dovetail: do not expose clock frequency to user

[Philippe Gerum via Xenomai]

From: Philippe Gerum <r...@xenomai.org>

We don't need this with Dovetail, there is no timestamp arithmetics to
perform in userland whatsoever: we get timestamps from the regular
vDSO-based clock_gettime() call.

Signed-off-by: Philippe Gerum <r...@xenomai.org>
---
 include/cobalt/kernel/dovetail/pipeline/pipeline.h | 6 ++++++
 include/cobalt/kernel/ipipe/pipeline/pipeline.h    | 6 ++++++
 kernel/cobalt/posix/syscall.c                      | 2 +-
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/include/cobalt/kernel/dovetail/pipeline/pipeline.h 
b/include/cobalt/kernel/dovetail/pipeline/pipeline.h
index a2e025e35..1d4e3f91d 100644
--- a/include/cobalt/kernel/dovetail/pipeline/pipeline.h
+++ b/include/cobalt/kernel/dovetail/pipeline/pipeline.h
@@ -7,6 +7,7 @@
 
 #include <linux/irq_pipeline.h>
 #include <cobalt/kernel/assert.h>
+#include <asm/xenomai/features.h>
 
 typedef unsigned long spl_t;
 
@@ -102,4 +103,9 @@ static inline void pipeline_prepare_panic(void)
        /* N/A */
 }
 
+static inline void pipeline_collect_features(struct cobalt_featinfo *f)
+{
+       f->clock_freq = 0;      /* N/A */
+}
+
 #endif /* !_COBALT_KERNEL_DOVETAIL_PIPELINE_H */
diff --git a/include/cobalt/kernel/ipipe/pipeline/pipeline.h 
b/include/cobalt/kernel/ipipe/pipeline/pipeline.h
index ceba7e3b0..e9e357bb0 100644
--- a/include/cobalt/kernel/ipipe/pipeline/pipeline.h
+++ b/include/cobalt/kernel/ipipe/pipeline/pipeline.h
@@ -10,6 +10,7 @@
 #endif
 
 #include <pipeline/machine.h>
+#include <asm/xenomai/features.h>
 
 #define xnsched_realtime_domain  cobalt_pipeline.domain
 
@@ -75,4 +76,9 @@ static inline void pipeline_prepare_panic(void)
        ipipe_prepare_panic();
 }
 
+static inline void pipeline_collect_features(struct cobalt_featinfo *f)
+{
+       f->clock_freq = cobalt_pipeline.clock_freq;
+}
+
 #endif /* !_COBALT_KERNEL_IPIPE_PIPELINE_H */
diff --git a/kernel/cobalt/posix/syscall.c b/kernel/cobalt/posix/syscall.c
index 3b3eaee8e..b9f33953a 100644
--- a/kernel/cobalt/posix/syscall.c
+++ b/kernel/cobalt/posix/syscall.c
@@ -332,7 +332,7 @@ static COBALT_SYSCALL(bind, lostage,
        f->feat_abirev = XENOMAI_ABI_REV;
        collect_arch_features(f);
 
-       f->clock_freq = cobalt_pipeline.clock_freq;
+       pipeline_collect_features(f);
        f->vdso_offset = cobalt_umm_offset(&cobalt_ppd_get(1)->umm, nkvdso);
 
        if (cobalt_copy_to_user(u_breq, &breq, sizeof(breq)))
-- 
2.29.2