FAILED: patch "[PATCH] MIPS: Loongson: Fix build error when make modules_install" failed to apply to 6.1-stable tree

The patch below does not apply to the 6.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 531b3d1195d096f14e030c4b01ec3a53b80276bf
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2023072131-hydrant-clatter-4b9f@gregkh' --subject-prefix 'PATCH 6.1.y' HEAD^..

Possible dependencies:

531b3d1195d0 ("MIPS: Loongson: Fix build error when make modules_install") 194a83521052 ("MIPS: Loongson: Move arch cflags to MIPS top level Makefile") 337ff6bb8960 ("MIPS: Prefer cc-option for additions to cflags")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 531b3d1195d096f14e030c4b01ec3a53b80276bf Mon Sep 17 00:00:00 2001
From: Huacai Chen <[email protected]>
Date: Wed, 28 Jun 2023 19:08:47 +0800
Subject: [PATCH] MIPS: Loongson: Fix build error when make modules_install

After commit 0e96ea5c3eb5904e5dc2f ("MIPS: Loongson64: Clean up use of cc-ifversion") we get a build error when make modules_install:

cc1: error: '-mloongson-mmi' must be used with '-mhard-float'

The reason is when make modules_install, 'call cc-option' doesn't work in $(KBUILD_CFLAGS) of 'CHECKFLAGS'. Then there is no -mno-loongson-mmi applied and -march=loongson3a enable MMI instructions.

To be detail, the error message comes from the CHECKFLAGS invocation of $(CC) but it has no impact on the final result of make modules_install, it is purely a cosmetic issue. The error occurs because cc-option is defined in scripts/Makefile.compiler, which is not included in Makefile when running 'make modules_install', as install targets are not supposed to require the compiler; see commit 805b2e1d427aab4b ("kbuild: include Makefile.compiler only when compiler is needed"). As a result, the call to check for '-mno-loongson-mmi' just never happens.

Fix this by partially reverting to the old logic, use 'call cc-option' to conditionally apply -march=loongson3a and -march=mips64r2.

By the way, Loongson-2E/2F is also broken in commit 13ceb48bc19c563e05f4 ("MIPS: Loongson2ef: Remove unnecessary {as,cc}-option calls") so fix it together.

index a7a4ee66a9d3..35a1b9b34734 100644
@@ -181,16 +181,12 @@ endif
 cflags-$(CONFIG_CAVIUM_CN63XXP1) += -Wa,-mfix-cn63xxp1
 cflags-$(CONFIG_CPU_BMIPS)	+= -march=mips32 -Wa,-mips32 -Wa,--trap
 
-cflags-$(CONFIG_CPU_LOONGSON2E) += -march=loongson2e -Wa,--trap
-cflags-$(CONFIG_CPU_LOONGSON2F) += -march=loongson2f -Wa,--trap
+cflags-$(CONFIG_CPU_LOONGSON2E) += $(call cc-option,-march=loongson2e) -Wa,--trap
+cflags-$(CONFIG_CPU_LOONGSON2F) += $(call cc-option,-march=loongson2f) -Wa,--trap
+cflags-$(CONFIG_CPU_LOONGSON64) += $(call cc-option,-march=loongson3a,-march=mips64r2) -Wa,--trap
 # Some -march= flags enable MMI instructions, and GCC complains about that
 # support being enabled alongside -msoft-float. Thus explicitly disable MMI.
 cflags-$(CONFIG_CPU_LOONGSON2EF) += $(call cc-option,-mno-loongson-mmi)
-ifdef CONFIG_CPU_LOONGSON64
-cflags-$(CONFIG_CPU_LOONGSON64)	+= -Wa,--trap
-cflags-$(CONFIG_CC_IS_GCC) += -march=loongson3a
-cflags-$(CONFIG_CC_IS_CLANG) += -march=mips64r2
-endif
 cflags-$(CONFIG_CPU_LOONGSON64) += $(call cc-option,-mno-loongson-mmi)
 
 cflags-$(CONFIG_CPU_R4000_WORKAROUNDS)	+= $(call cc-option,-mfix-r4000,)