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| -rw-r--r-- | config/Config-kernel.in | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/config/Config-kernel.in b/config/Config-kernel.in index eeda3e1b6f..d9a9fe687f 100644 --- a/config/Config-kernel.in +++ b/config/Config-kernel.in @@ -54,6 +54,24 @@ config KERNEL_ARM_PMU default n depends on (arm || aarch64) +config KERNEL_X86_VSYSCALL_EMULATION + bool "Enable vsyscall emulation" + default n + depends on x86_64 + help + This enables emulation of the legacy vsyscall page. Disabling + it is roughly equivalent to booting with vsyscall=none, except + that it will also disable the helpful warning if a program + tries to use a vsyscall. With this option set to N, offending + programs will just segfault, citing addresses of the form + 0xffffffffff600?00. + + This option is required by many programs built before 2013, and + care should be used even with newer programs if set to N. + + Disabling this option saves about 7K of kernel size and + possibly 4K of additional runtime pagetable memory. + config KERNEL_PERF_EVENTS bool "Compile the kernel with performance events and counters" default n |