linux-kernel - [PATCH 04/19] vdso/datapage: Define for vdso

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Message-Id: <20250303-vdso-clock-v1-4-c1b5c69a166f@linutronix.de>
Date: Mon, 03 Mar 2025 12:11:06 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
 Vincenzo Frascino <vincenzo.frascino@....com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Anna-Maria Behnsen <anna-maria@...utronix.de>, 
 Frederic Weisbecker <frederic@...nel.org>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Naveen N Rao <naveen@...nel.org>, Heiko Carstens <hca@...ux.ibm.com>, 
 Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org, 
 linux-arch@...r.kernel.org, Nam Cao <namcao@...utronix.de>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH 04/19] vdso/datapage: Define for vdso_data to make rework
 of vdso possible

From: Anna-Maria Behnsen <anna-maria@...utronix.de>

PTP clocks could also be supported by the vdso to use the advantages of
this implementation. Therefore the struct must be reworked. For a
transition to the new structure of the vdso, add a define which maps
vdso_clock to vdso_data. This will be removed when all users are updated
step by step.

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>
---
 include/vdso/datapage.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index dfd98f969f151eca3c551c3e90f69af9ee8f22bb..1df22e8bb9b31153546b72b1e8b8c8aeaed7d9e3 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -129,6 +129,8 @@ struct vdso_time_data {
 	struct arch_vdso_time_data arch_data;
 } ____cacheline_aligned;

+#define vdso_clock vdso_time_data
+
 /**
  * struct vdso_rng_data - vdso RNG state information
  * @generation:	counter representing the number of RNG reseeds

-- 
2.48.1