linux-kernel - [PATCH v2 1/2] UML: hard-code the result of 'uname -s'

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Message-Id: <20230721171857.3612639-1-masahiroy@kernel.org>
Date:   Sat, 22 Jul 2023 02:18:56 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Richard Weinberger <richard@....at>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        linux-um@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Jiri Slaby <jirislaby@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: [PATCH v2 1/2] UML: hard-code the result of 'uname -s'

We rely on 'uname -s' returning 'Linux' because there are os-Linux/
directories, but no other os-*/.

Supporting a non-Linux host is unlikely to happen.

Let's hard-code 'Linux'.

Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
---

(no changes since v1)

 arch/um/Makefile     | 7 +++----
 arch/x86/um/Makefile | 2 +-
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/um/Makefile b/arch/um/Makefile
index da4d5256af2f..1735a562453d 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -18,14 +18,13 @@ else
 endif
 
 ARCH_DIR := arch/um
-OS := $(shell uname -s)
 # We require bash because the vmlinux link and loader script cpp use bash
 # features.
 SHELL := /bin/bash
 
 core-y			+= $(ARCH_DIR)/kernel/		\
 			   $(ARCH_DIR)/drivers/		\
-			   $(ARCH_DIR)/os-$(OS)/
+			   $(ARCH_DIR)/os-Linux/
 
 MODE_INCLUDE	+= -I$(srctree)/$(ARCH_DIR)/include/shared/skas
 
@@ -78,7 +77,7 @@ USER_CFLAGS = $(patsubst $(KERNEL_DEFINES),,$(patsubst -I%,,$(KBUILD_CFLAGS))) \
 		-idirafter $(objtree)/include -D__KERNEL__ -D__UM_HOST__
 
 #This will adjust *FLAGS accordingly to the platform.
-include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
+include $(srctree)/$(ARCH_DIR)/Makefile-os-Linux
 
 KBUILD_CPPFLAGS += -I$(srctree)/$(HOST_DIR)/include \
 		   -I$(srctree)/$(HOST_DIR)/include/uapi \
@@ -155,4 +154,4 @@ archclean:
 	@find . \( -name '*.bb' -o -name '*.bbg' -o -name '*.da' \
 		-o -name '*.gcov' \) -type f -print | xargs rm -f
 
-export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING OS DEV_NULL_PATH
+export HEADER_ARCH SUBARCH USER_CFLAGS CFLAGS_NO_HARDENING DEV_NULL_PATH
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index ee89f6bb9242..e207e6748aa2 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -13,7 +13,7 @@ obj-y = bugs_$(BITS).o delay.o fault.o ldt.o \
 	ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \
 	stub_$(BITS).o stub_segv.o \
 	sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \
-	mem_$(BITS).o subarch.o os-$(OS)/
+	mem_$(BITS).o subarch.o os-Linux/
 
 ifeq ($(CONFIG_X86_32),y)
 
-- 
2.39.2