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vdso: Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT

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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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240325064023.2997-4-adrian.hunter@intel.com
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Adrian Hunter 2024-03-25 08:40:07 +02:00 committed by Thomas Gleixner
parent 5b26ef660a
commit 0c68458b0a
1 changed files with 7 additions and 0 deletions
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lib/vdso/Kconfig
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@ -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