Hi Tyler,
Yes, we need to backport this patchset to all the current supported
kernel. Since most of the supported kernel contains the whole RFI infra
structure, I do not expect it to be hard. If you need help, I can find
someone to help on the backport.
Regarding the problem you are facing, I talked to the powerpc maintainer
(Michael Ellerman) and he suggested squashing the warning using
something as the code below. He will be also sending the patch upstream.
```
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 66f2b6299c40..44c30dd38067 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -880,7 +880,7 @@ void rfi_flush_enable(bool enable)
rfi_flush = enable;
}
-static void init_fallback_flush(void)
+static void __ref init_fallback_flush(void)
{
u64 l1d_size, limit;
int cpu;
```
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https://bugs.launchpad.net/bugs/1760099
Title:
Additional spectre and meltdown patches
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