From: Michal Suchanek <msuchanek@xxxxxxx> [ Upstream commit a6cae77f1bc89368a4e2822afcddc45c3062d499 ] commit 7c6986ade69e ("powerpc/stacktrace: Fix spurious "stale" traces in raise_backtrace_ipi()") introduces udelay() call without including the linux/delay.h header. This may happen to work on master but the header that declares the functionshould be included nonetheless. Fixes: 7c6986ade69e ("powerpc/stacktrace: Fix spurious "stale" traces in raise_backtrace_ipi()") Signed-off-by: Michal Suchanek <msuchanek@xxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20210729180103.15578-1-msuchanek@xxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- arch/powerpc/kernel/stacktrace.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/kernel/stacktrace.c b/arch/powerpc/kernel/stacktrace.c index b13c6213b0d9..890f95151fb4 100644 --- a/arch/powerpc/kernel/stacktrace.c +++ b/arch/powerpc/kernel/stacktrace.c @@ -8,6 +8,7 @@ * Copyright 2018 Nick Piggin, Michael Ellerman, IBM Corp. */ +#include <linux/delay.h> #include <linux/export.h> #include <linux/kallsyms.h> #include <linux/module.h> -- 2.30.2