From: Adrian Hunter <adrian.hunter@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
John Stultz <jstultz@google.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
linux-s390@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
x86@kernel.org, "Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
Ingo Molnar <mingo@redhat.com>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Nicholas Piggin <npiggin@gmail.com>,
Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Anna-Maria Behnsen <anna-maria@linutronix.de>,
Stephen Boyd <sboyd@kernel.org>,
Randy Dunlap <rdunlap@infradead.org>,
linux-kernel@vger.kernel.org, Sven Schnelle <svens@linux.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH V2 03/19] vdso: Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT
Date: Mon, 25 Mar 2024 08:40:07 +0200 [thread overview]
Message-ID: <20240325064023.2997-4-adrian.hunter@intel.com> (raw)
In-Reply-To: <20240325064023.2997-1-adrian.hunter@intel.com>
Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT in preparation to add
multiplication overflow protection to the VDSO time getter functions.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
lib/vdso/Kconfig | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/lib/vdso/Kconfig b/lib/vdso/Kconfig
index d883ac299508..c46c2300517c 100644
--- a/lib/vdso/Kconfig
+++ b/lib/vdso/Kconfig
@@ -30,4 +30,11 @@ config GENERIC_VDSO_TIME_NS
Selected by architectures which support time namespaces in the
VDSO
+config GENERIC_VDSO_OVERFLOW_PROTECT
+ bool
+ help
+ Select to add multiplication overflow protection to the VDSO
+ time getter functions for the price of an extra conditional
+ in the hotpath.
+
endif
--
2.34.1
next prev parent reply other threads:[~2024-03-25 6:43 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-25 6:40 [PATCH V2 00/19] timekeeping: Handle potential multiplication overflow Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 01/19] vdso: Consolidate vdso_calc_delta() Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 02/19] vdso: Consolidate nanoseconds calculation Adrian Hunter
2024-03-25 6:40 ` Adrian Hunter [this message]
2024-03-25 6:40 ` [PATCH V2 04/19] math64: Tidy mul_u64_u32_shr() Adrian Hunter
2024-04-24 15:11 ` Peter Zijlstra
2024-03-25 6:40 ` [PATCH V2 05/19] vdso: math64: Provide mul_u64_u32_add_u64_shr() Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 06/19] vdso: Add vdso_data::max_cycles Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 07/19] vdso: Make delta calculation overflow safe Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 08/19] x86/vdso: " Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 09/19] timekeeping: Move timekeeping helper functions Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 10/19] timekeeping: Rename fast_tk_get_delta_ns() to __timekeeping_get_ns() Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 11/19] timekeeping: Tidy timekeeping_cycles_to_ns() slightly Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 12/19] timekeeping: Reuse timekeeping_cycles_to_ns() Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 13/19] timekeeping: Refactor timekeeping helpers Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 14/19] timekeeping: Consolidate " Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 15/19] timekeeping: Fold in timekeeping_delta_to_ns() Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 16/19] timekeeping: Prepare timekeeping_cycles_to_ns() for overflow safety Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 17/19] timekeeping: Make delta calculation overflow safe Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 18/19] timekeeping: Let timekeeping_cycles_to_ns() handle both under and overflow Adrian Hunter
2024-03-25 6:40 ` [PATCH V2 19/19] clocksource: Make watchdog and suspend-timing multiplication overflow safe Adrian Hunter
2024-03-25 18:11 ` [PATCH V2 00/19] timekeeping: Handle potential multiplication overflow Arnd Bergmann
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