The following commit has been merged into the x86/fred branch of tip: Commit-ID: 2cce95918d635126098d784c040b59333c464b20 Gitweb: https://git.kernel.org/tip/2cce95918d635126098d784c040b59333c464b20 Author: H. Peter Anvin (Intel) <hpa@xxxxxxxxx> AuthorDate: Tue, 05 Dec 2023 02:49:54 -08:00 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Thu, 25 Jan 2024 19:10:30 +01:00 x86/fred: Add Kconfig option for FRED (CONFIG_X86_FRED) Add the configuration option CONFIG_X86_FRED to enable FRED. Signed-off-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx> Signed-off-by: Xin Li <xin3.li@xxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Tested-by: Shan Kang <shan.kang@xxxxxxxxx> Link: https://lore.kernel.org/r/20231205105030.8698-6-xin3.li@xxxxxxxxx --- arch/x86/Kconfig | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5edec17..854ab38 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -496,6 +496,15 @@ config X86_CPU_RESCTRL Say N if unsure. +config X86_FRED + bool "Flexible Return and Event Delivery" + depends on X86_64 + help + When enabled, try to use Flexible Return and Event Delivery + instead of the legacy SYSCALL/SYSENTER/IDT architecture for + ring transitions and exception/interrupt handling if the + system supports. + if X86_32 config X86_BIGSMP bool "Support for big SMP systems with more than 8 CPUs"
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