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-rw-r--r--config/Config-kernel.in18
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