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| author | Yousong Zhou <yszhou4tech@gmail.com> | 2019-08-27 03:52:56 +0000 |
|---|---|---|
| committer | Yousong Zhou <yszhou4tech@gmail.com> | 2019-09-12 02:30:26 +0000 |
| commit | 083bb9b6a4e33a2881da9086c65792148d0d04b1 (patch) | |
| tree | 8489c70f23bc7c10653ab878430ff5f47a637a79 | |
| parent | 7489ea85a2596020587ba3202a55821075aa913f (diff) | |
| download | upstream-083bb9b6a4e33a2881da9086c65792148d0d04b1.tar.gz upstream-083bb9b6a4e33a2881da9086c65792148d0d04b1.tar.bz2 upstream-083bb9b6a4e33a2881da9086c65792148d0d04b1.zip | |
config: kernel: add KERNEL_X86_VSYSCALL_EMULATION
Binaries in container images may need this. E.g. nginx:1.7.9 used in
k8s default deployment manifest file for demostration [1]
[1] https://kubernetes.io/docs/concepts/workloads/controllers/deployment/#creating-a-deployment
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
| -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 |