s390x build failures #594
Description
I'm running into big-endian related build failures on the s390x architecture.
I'm currently playing around with the following attempted fix, but the CONFIG_CPU_BIG_ENDIAN=y setting doesn't appear to make it through to my KCONFIG provided kernel config. Debugging this is very slow going, as qemu-system-s390x runs at a snails pace on my x86-64 build host.
From 9e5b33d105bc7de590486680d2133ca68c33c85f Mon Sep 17 00:00:00 2001
From: David Disseldorp <[email protected]>
Date: Wed, 23 Apr 2025 08:07:43 +0200
Subject: [PATCH] tools/lkl: fix s390x and big endian detection
Fixes: 0d680a3d5886e ("lkl: remove CONFIG_ leaks in uapi headers")
Signed-off-by: David Disseldorp <[email protected]>
---
tools/lkl/Makefile.autoconf | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/tools/lkl/Makefile.autoconf b/tools/lkl/Makefile.autoconf
index 36f24cfd05c81..7289df264108c 100644
--- a/tools/lkl/Makefile.autoconf
+++ b/tools/lkl/Makefile.autoconf
@@ -119,8 +119,9 @@ define nt_host
endef
define s390_host
- $(call set_kernel_config_h,LKL_CONFIG_ENDIAN,1)
+ $(call set_kernel_config_h,LKL_CONFIG_BIG_ENDIAN,1)
$(call set_kernel_config,BIG_ENDIAN,y)
+ $(call set_kernel_config,CPU_BIG_ENDIAN,y)
endef
define 64bit_host
@@ -296,7 +297,7 @@ define do_autoconf
$(eval EXEC_FMT := $(shell echo $(LD_FMT) | cut -d "-" -f1))
$(call set_kernel_config,OUTPUT_FORMAT,\"$(LD_FMT)\")
$(if $(or $(filter $(EXEC_FMT),elf64),$(filter $(LD_FMT),pe-x86-64)),$(call 64bit_host))
- $(if $(filter $(EXEC_FMT),elf64-s390),$(call s390_host))
+ $(if $(filter $(LD_FMT),elf64-s390),$(call s390_host))
$(if $(filter $(EXEC_FMT),$(POSIX_HOSTS)),$(call posix_host,$(LD_FMT)))
$(if $(filter $(EXEC_FMT),$(NT_HOSTS)),$(call nt_host,$(LD_FMT)))
$(if $(and $(filter yes,$(kasan)),$(filter $(LD_FMT),$(KASAN_HOSTS))),$(call kasan_enable,$(LD_FMT)))