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Message-ID: <174099858523.10177.1509794545670021372.tip-bot2@tip-bot2>
Date: Mon, 03 Mar 2025 10:43:05 -0000
From: "tip-bot2 for Anna-Maria Behnsen" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: "Anna-Maria Behnsen" <anna-maria@...utronix.de>,
Nam Cao <namcao@...utronix.de>, thomas.weissschuh@...utronix.de,
Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
linux-kernel@...r.kernel.org
Subject:
[tip: timers/vdso] vdso/helpers: Prepare introduction of struct vdso_clock
The following commit has been merged into the timers/vdso branch of tip:
Commit-ID: 7b0ac1447135bc819db9954aaf86ff4c72427557
Gitweb: https://git.kernel.org/tip/7b0ac1447135bc819db9954aaf86ff4c72427557
Author: Anna-Maria Behnsen <anna-maria@...utronix.de>
AuthorDate: Tue, 25 Feb 2025 13:36:37 +01:00
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Mon, 03 Mar 2025 10:24:34 +01:00
vdso/helpers: Prepare introduction of struct vdso_clock
To support multiple PTP clocks, the VDSO data structure needs to be
reworked. All clock specific data will end up in struct vdso_clock and in
struct vdso_time_data there will be array of it. By now, vdso_clock is
simply a define which maps vdso_clock to vdso_time_data.
Prepare all functions which need the pointer to the vdso_clock array to
work well after the structures get reworked. Replace struct vdso_time_data
pointer with struct vdso_clock pointer whenever applicable.
No functional change.
Signed-off-by: Anna-Maria Behnsen <anna-maria@...utronix.de>
Signed-off-by: Nam Cao <namcao@...utronix.de>
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
include/vdso/helpers.h | 20 ++++++++++++--------
1 file changed, 12 insertions(+), 8 deletions(-)
diff --git a/include/vdso/helpers.h b/include/vdso/helpers.h
index 41c3087..28f0707 100644
--- a/include/vdso/helpers.h
+++ b/include/vdso/helpers.h
@@ -7,49 +7,53 @@
#include <asm/barrier.h>
#include <vdso/datapage.h>
-static __always_inline u32 vdso_read_begin(const struct vdso_time_data *vd)
+static __always_inline u32 vdso_read_begin(const struct vdso_clock *vc)
{
u32 seq;
- while (unlikely((seq = READ_ONCE(vd->seq)) & 1))
+ while (unlikely((seq = READ_ONCE(vc->seq)) & 1))
cpu_relax();
smp_rmb();
return seq;
}
-static __always_inline u32 vdso_read_retry(const struct vdso_time_data *vd,
+static __always_inline u32 vdso_read_retry(const struct vdso_clock *vc,
u32 start)
{
u32 seq;
smp_rmb();
- seq = READ_ONCE(vd->seq);
+ seq = READ_ONCE(vc->seq);
return seq != start;
}
static __always_inline void vdso_write_begin(struct vdso_time_data *vd)
{
+ struct vdso_clock *vc = vd;
+
/*
* WRITE_ONCE() is required otherwise the compiler can validly tear
* updates to vd[x].seq and it is possible that the value seen by the
* reader is inconsistent.
*/
- WRITE_ONCE(vd[CS_HRES_COARSE].seq, vd[CS_HRES_COARSE].seq + 1);
- WRITE_ONCE(vd[CS_RAW].seq, vd[CS_RAW].seq + 1);
+ WRITE_ONCE(vc[CS_HRES_COARSE].seq, vc[CS_HRES_COARSE].seq + 1);
+ WRITE_ONCE(vc[CS_RAW].seq, vc[CS_RAW].seq + 1);
smp_wmb();
}
static __always_inline void vdso_write_end(struct vdso_time_data *vd)
{
+ struct vdso_clock *vc = vd;
+
smp_wmb();
/*
* WRITE_ONCE() is required otherwise the compiler can validly tear
* updates to vd[x].seq and it is possible that the value seen by the
* reader is inconsistent.
*/
- WRITE_ONCE(vd[CS_HRES_COARSE].seq, vd[CS_HRES_COARSE].seq + 1);
- WRITE_ONCE(vd[CS_RAW].seq, vd[CS_RAW].seq + 1);
+ WRITE_ONCE(vc[CS_HRES_COARSE].seq, vc[CS_HRES_COARSE].seq + 1);
+ WRITE_ONCE(vc[CS_RAW].seq, vc[CS_RAW].seq + 1);
}
#endif /* !__ASSEMBLY__ */
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