Date: Mon, 1 Jul 2024 11:14:54 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Edward Liaw <edliaw@...gle.com>, linux-kselftest@...r.kernel.org,
 Eric Biederman <ebiederm@...ssion.com>, Kees Cook <kees@...nel.org>,
 Shuah Khan <shuah@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>,
 Darren Hart <dvhart@...radead.org>, Davidlohr Bueso <dave@...olabs.net>,
 André Almeida <andrealmeid@...lia.com>,
 Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>,
 Paolo Bonzini <pbonzini@...hat.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Fenghua Yu <fenghua.yu@...el.com>,
 Reinette Chatre <reinette.chatre@...el.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Jarkko Sakkinen <jarkko@...nel.org>,
 Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>,
 linux-kernel@...r.kernel.org, seanjc@...gle.com, kernel-team@...roid.com,
 linux-mm@...ck.org, iommu@...ts.linux.dev, kvm@...r.kernel.org,
 netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-riscv@...ts.infradead.org, linux-sgx@...r.kernel.org,
 John Hubbard <jhubbard@...dia.com>
Subject: Re: [PATCH v7 1/1] selftests: Centralize -D_GNU_SOURCE= to CFLAGS in
 lib.mk

On 6/26/24 3:34 AM, Edward Liaw wrote:
> Centralize the _GNU_SOURCE definition to CFLAGS in lib.mk.  Remove
> redundant defines from Makefiles that import lib.mk.  Convert any usage
> of "#define _GNU_SOURCE 1" to "#define _GNU_SOURCE".
> 
> This uses the form "-D_GNU_SOURCE=", which is equivalent to
> "#define _GNU_SOURCE".
> 
> Otherwise using "-D_GNU_SOURCE" is equivalent to "-D_GNU_SOURCE=1" and
> "#define _GNU_SOURCE 1", which is less commonly seen in source code and
> would require many changes in selftests to avoid redefinition warnings.
> 
> Suggested-by: John Hubbard <jhubbard@...dia.com>
> Signed-off-by: Edward Liaw <edliaw@...gle.com>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> ---
>  tools/testing/selftests/exec/Makefile             | 1 -
>  tools/testing/selftests/futex/functional/Makefile | 2 +-
>  tools/testing/selftests/intel_pstate/Makefile     | 2 +-
>  tools/testing/selftests/iommu/Makefile            | 2 --
>  tools/testing/selftests/kvm/Makefile              | 2 +-
>  tools/testing/selftests/lib.mk                    | 3 +++
>  tools/testing/selftests/mm/thuge-gen.c            | 2 +-
>  tools/testing/selftests/net/Makefile              | 2 +-
>  tools/testing/selftests/net/tcp_ao/Makefile       | 2 +-
>  tools/testing/selftests/proc/Makefile             | 1 -
>  tools/testing/selftests/resctrl/Makefile          | 2 +-
>  tools/testing/selftests/ring-buffer/Makefile      | 1 -
>  tools/testing/selftests/riscv/mm/Makefile         | 2 +-
>  tools/testing/selftests/sgx/Makefile              | 2 +-
>  tools/testing/selftests/tmpfs/Makefile            | 1 -
>  15 files changed, 12 insertions(+), 15 deletions(-)
> 
> diff --git a/tools/testing/selftests/exec/Makefile b/tools/testing/selftests/exec/Makefile
> index ab67d58cfab7..ba012bc5aab9 100644
> --- a/tools/testing/selftests/exec/Makefile
> +++ b/tools/testing/selftests/exec/Makefile
> @@ -1,7 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  CFLAGS = -Wall
>  CFLAGS += -Wno-nonnull
> -CFLAGS += -D_GNU_SOURCE
>  
>  ALIGNS := 0x1000 0x200000 0x1000000
>  ALIGN_PIES        := $(patsubst %,load_address.%,$(ALIGNS))
> diff --git a/tools/testing/selftests/futex/functional/Makefile b/tools/testing/selftests/futex/functional/Makefile
> index 994fa3468f17..f79f9bac7918 100644
> --- a/tools/testing/selftests/futex/functional/Makefile
> +++ b/tools/testing/selftests/futex/functional/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  INCLUDES := -I../include -I../../ $(KHDR_INCLUDES)
> -CFLAGS := $(CFLAGS) -g -O2 -Wall -D_GNU_SOURCE= -pthread $(INCLUDES) $(KHDR_INCLUDES)
> +CFLAGS := $(CFLAGS) -g -O2 -Wall -pthread $(INCLUDES) $(KHDR_INCLUDES)
>  LDLIBS := -lpthread -lrt
>  
>  LOCAL_HDRS := \
> diff --git a/tools/testing/selftests/intel_pstate/Makefile b/tools/testing/selftests/intel_pstate/Makefile
> index 05d66ef50c97..f45372cb00fe 100644
> --- a/tools/testing/selftests/intel_pstate/Makefile
> +++ b/tools/testing/selftests/intel_pstate/Makefile
> @@ -1,5 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -CFLAGS := $(CFLAGS) -Wall -D_GNU_SOURCE
> +CFLAGS := $(CFLAGS) -Wall
>  LDLIBS += -lm
>  
>  ARCH ?= $(shell uname -m 2>/dev/null || echo not)
> diff --git a/tools/testing/selftests/iommu/Makefile b/tools/testing/selftests/iommu/Makefile
> index 32c5fdfd0eef..fd6477911f24 100644
> --- a/tools/testing/selftests/iommu/Makefile
> +++ b/tools/testing/selftests/iommu/Makefile
> @@ -2,8 +2,6 @@
>  CFLAGS += -Wall -O2 -Wno-unused-function
>  CFLAGS += $(KHDR_INCLUDES)
>  
> -CFLAGS += -D_GNU_SOURCE
> -
>  TEST_GEN_PROGS :=
>  TEST_GEN_PROGS += iommufd
>  TEST_GEN_PROGS += iommufd_fail_nth
> diff --git a/tools/testing/selftests/kvm/Makefile b/tools/testing/selftests/kvm/Makefile
> index ac280dcba996..4ee37abf70ff 100644
> --- a/tools/testing/selftests/kvm/Makefile
> +++ b/tools/testing/selftests/kvm/Makefile
> @@ -231,7 +231,7 @@ LINUX_TOOL_ARCH_INCLUDE = $(top_srcdir)/tools/arch/$(ARCH)/include
>  endif
>  CFLAGS += -Wall -Wstrict-prototypes -Wuninitialized -O2 -g -std=gnu99 \
>  	-Wno-gnu-variable-sized-type-not-at-end -MD -MP -DCONFIG_64BIT \
> -	-D_GNU_SOURCE -fno-builtin-memcmp -fno-builtin-memcpy \
> +	-fno-builtin-memcmp -fno-builtin-memcpy \
>  	-fno-builtin-memset -fno-builtin-strnlen \
>  	-fno-stack-protector -fno-PIE -I$(LINUX_TOOL_INCLUDE) \
>  	-I$(LINUX_TOOL_ARCH_INCLUDE) -I$(LINUX_HDR_PATH) -Iinclude \
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index 7b299ed5ff45..d6edcfcb5be8 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -196,6 +196,9 @@ endef
>  clean: $(if $(TEST_GEN_MODS_DIR),clean_mods_dir)
>  	$(CLEAN)
>  
> +# Build with _GNU_SOURCE by default
> +CFLAGS += -D_GNU_SOURCE=
> +
>  # Enables to extend CFLAGS and LDFLAGS from command line, e.g.
>  # make USERCFLAGS=-Werror USERLDFLAGS=-static
>  CFLAGS += $(USERCFLAGS)
> diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c
> index d50dc71cac32..e4370b79b62f 100644
> --- a/tools/testing/selftests/mm/thuge-gen.c
> +++ b/tools/testing/selftests/mm/thuge-gen.c
> @@ -13,7 +13,7 @@
>     sudo ipcs | awk '$1 == "0x00000000" {print $2}' | xargs -n1 sudo ipcrm -m
>     (warning this will remove all if someone else uses them) */
>  
> -#define _GNU_SOURCE 1
> +#define _GNU_SOURCE
>  #include <sys/mman.h>
>  #include <linux/mman.h>
>  #include <stdlib.h>
> diff --git a/tools/testing/selftests/net/Makefile b/tools/testing/selftests/net/Makefile
> index bc3925200637..8eaffd7a641c 100644
> --- a/tools/testing/selftests/net/Makefile
> +++ b/tools/testing/selftests/net/Makefile
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  # Makefile for net selftests
>  
> -CFLAGS =  -Wall -Wl,--no-as-needed -O2 -g
> +CFLAGS +=  -Wall -Wl,--no-as-needed -O2 -g
>  CFLAGS += -I../../../../usr/include/ $(KHDR_INCLUDES)
>  # Additional include paths needed by kselftest.h
>  CFLAGS += -I../
> diff --git a/tools/testing/selftests/net/tcp_ao/Makefile b/tools/testing/selftests/net/tcp_ao/Makefile
> index 522d991e310e..bd88b90b902b 100644
> --- a/tools/testing/selftests/net/tcp_ao/Makefile
> +++ b/tools/testing/selftests/net/tcp_ao/Makefile
> @@ -26,7 +26,7 @@ LIB	:= $(LIBDIR)/libaotst.a
>  LDLIBS	+= $(LIB) -pthread
>  LIBDEPS	:= lib/aolib.h Makefile
>  
> -CFLAGS	:= -Wall -O2 -g -D_GNU_SOURCE -fno-strict-aliasing
> +CFLAGS	+= -Wall -O2 -g -fno-strict-aliasing
>  CFLAGS	+= $(KHDR_INCLUDES)
>  CFLAGS	+= -iquote ./lib/ -I ../../../../include/
>  
> diff --git a/tools/testing/selftests/proc/Makefile b/tools/testing/selftests/proc/Makefile
> index 6066f607f758..ee424a9f075f 100644
> --- a/tools/testing/selftests/proc/Makefile
> +++ b/tools/testing/selftests/proc/Makefile
> @@ -1,6 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  CFLAGS += -Wall -O2 -Wno-unused-function
> -CFLAGS += -D_GNU_SOURCE
>  LDFLAGS += -pthread
>  
>  TEST_GEN_PROGS :=
> diff --git a/tools/testing/selftests/resctrl/Makefile b/tools/testing/selftests/resctrl/Makefile
> index 021863f86053..f408bd6bfc3d 100644
> --- a/tools/testing/selftests/resctrl/Makefile
> +++ b/tools/testing/selftests/resctrl/Makefile
> @@ -1,6 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  
> -CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2 -D_GNU_SOURCE
> +CFLAGS = -g -Wall -O2 -D_FORTIFY_SOURCE=2
>  CFLAGS += $(KHDR_INCLUDES)
>  
>  TEST_GEN_PROGS := resctrl_tests
> diff --git a/tools/testing/selftests/ring-buffer/Makefile b/tools/testing/selftests/ring-buffer/Makefile
> index 627c5fa6d1ab..23605782639e 100644
> --- a/tools/testing/selftests/ring-buffer/Makefile
> +++ b/tools/testing/selftests/ring-buffer/Makefile
> @@ -1,7 +1,6 @@
>  # SPDX-License-Identifier: GPL-2.0
>  CFLAGS += -Wl,-no-as-needed -Wall
>  CFLAGS += $(KHDR_INCLUDES)
> -CFLAGS += -D_GNU_SOURCE
>  
>  TEST_GEN_PROGS = map_test
>  
> diff --git a/tools/testing/selftests/riscv/mm/Makefile b/tools/testing/selftests/riscv/mm/Makefile
> index c333263f2b27..4664ed79e20b 100644
> --- a/tools/testing/selftests/riscv/mm/Makefile
> +++ b/tools/testing/selftests/riscv/mm/Makefile
> @@ -3,7 +3,7 @@
>  # Originally tools/testing/arm64/abi/Makefile
>  
>  # Additional include paths needed by kselftest.h and local headers
> -CFLAGS += -D_GNU_SOURCE -std=gnu99 -I.
> +CFLAGS += -std=gnu99 -I.
>  
>  TEST_GEN_FILES := mmap_default mmap_bottomup
>  
> diff --git a/tools/testing/selftests/sgx/Makefile b/tools/testing/selftests/sgx/Makefile
> index 867f88ce2570..03b5e13b872b 100644
> --- a/tools/testing/selftests/sgx/Makefile
> +++ b/tools/testing/selftests/sgx/Makefile
> @@ -12,7 +12,7 @@ OBJCOPY := $(CROSS_COMPILE)objcopy
>  endif
>  
>  INCLUDES := -I$(top_srcdir)/tools/include
> -HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC
> +HOST_CFLAGS := -Wall -Werror -g $(INCLUDES) -fPIC $(CFLAGS)
>  HOST_LDFLAGS := -z noexecstack -lcrypto
>  ENCL_CFLAGS += -Wall -Werror -static-pie -nostdlib -ffreestanding -fPIE \
>  	       -fno-stack-protector -mrdrnd $(INCLUDES)
> diff --git a/tools/testing/selftests/tmpfs/Makefile b/tools/testing/selftests/tmpfs/Makefile
> index aa11ccc92e5b..3be931e1193f 100644
> --- a/tools/testing/selftests/tmpfs/Makefile
> +++ b/tools/testing/selftests/tmpfs/Makefile
> @@ -1,6 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0-only
>  CFLAGS += -Wall -O2
> -CFLAGS += -D_GNU_SOURCE
>  
>  TEST_GEN_PROGS :=
>  TEST_GEN_PROGS += bug-link-o-tmpfile

-- 
BR,
Muhammad Usama Anjum

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