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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-06 13:01:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-06 13:01:16 -0700
commit0a499fc5c37e6db096969a83534fd98a2bf2b36c (patch)
tree682875f57706b1e28bfe579372a465bd778ce3dc /kernel/cpu.c
parente50c5d2e725eb7192a62868d4a9987907741ff62 (diff)
parent0336e04a6520bdaefdb0769d2a70084fa52e81ed (diff)
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Merge branch 'core-speculation-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull speculation mitigation update from Ingo Molnar: "This adds the "mitigations=" bootline option, which offers a cross-arch set of options that will work on x86, PowerPC and s390 that will map to the arch specific option internally" * 'core-speculation-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: s390/speculation: Support 'mitigations=' cmdline option powerpc/speculation: Support 'mitigations=' cmdline option x86/speculation: Support 'mitigations=' cmdline option cpu/speculation: Add 'mitigations=' cmdline option
Diffstat (limited to 'kernel/cpu.c')
-rw-r--r--kernel/cpu.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 6754f3ecfd94..43e741e88691 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2304,3 +2304,18 @@ void __init boot_cpu_hotplug_init(void)
#endif
this_cpu_write(cpuhp_state.state, CPUHP_ONLINE);
}
+
+enum cpu_mitigations cpu_mitigations __ro_after_init = CPU_MITIGATIONS_AUTO;
+
+static int __init mitigations_parse_cmdline(char *arg)
+{
+ if (!strcmp(arg, "off"))
+ cpu_mitigations = CPU_MITIGATIONS_OFF;
+ else if (!strcmp(arg, "auto"))
+ cpu_mitigations = CPU_MITIGATIONS_AUTO;
+ else if (!strcmp(arg, "auto,nosmt"))
+ cpu_mitigations = CPU_MITIGATIONS_AUTO_NOSMT;
+
+ return 0;
+}
+early_param("mitigations", mitigations_parse_cmdline);