Revert "prohibit rcutorture from being compiled into the kernel"

This reverts commit 9aaffc898ff4a3df18c5fc4b9e0fa47e779ad726.

That commit was a very bad idea. RCU_TORTURE found many boot timing
bugs and other sorts of bugs in the past, so excluding it from
boot images is very silly.

The option already depends on DEBUG_KERNEL and is disabled by default.
Even when it runs, the test threads are reniced. If it annoys people
we could add a runtime sysctl.

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index d2099f41aa1ebe46bc614c7187290f7a32dd941c..f51ba2fa26629a7dd6db5b573d756d2262512866 100644 (file)
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -531,13 +531,14 @@ config BOOT_PRINTK_DELAY
 config RCU_TORTURE_TEST
        tristate "torture tests for RCU"
        depends on DEBUG_KERNEL
-       depends on m
        default n
        help
          This option provides a kernel module that runs torture tests
          on the RCU infrastructure.  The kernel module may be built
          after the fact on the running kernel to be tested, if desired.
 
+         Say Y here if you want RCU torture tests to start automatically
+         at boot time (you probably don't).
          Say M if you want the RCU torture tests to build as a module.
          Say N if you are unsure.