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Date: Fri, 8 Dec 2023 18:05:02 -0800
From: John Hubbard <jhubbard@...dia.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
Peter Zijlstra <peterz@...radead.org>
CC: David Hildenbrand <david@...hat.com>, Peter Xu <peterx@...hat.com>,
"Shuah Khan" <shuah@...nel.org>,
Nathan Chancellor <nathan@...nel.org>, <linux-mm@...ck.org>,
<linux-kselftest@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Anders Roxell <anders.roxell@...aro.org>,
Muhammad Usama Anjum <usama.anjum@...labora.com>,
Jonathan Corbet <corbet@....net>
Subject: Re: [PATCH] Revert "selftests: error out if kernel header files are
not yet built"
...and, somehow I failed to Cc Peter Z. Doing that now.
thanks,
John Hubbard
NVIDIA
On 12/8/23 18:01, John Hubbard wrote:
> This reverts commit 9fc96c7c19df ("selftests: error out if kernel header
> files are not yet built").
>
> It turns out that requiring the kernel headers to be built as a
> prerequisite to building selftests, does not work in many cases. For
> example, Peter Zijlstra writes:
>
> "My biggest beef with the whole thing is that I simply do not want to use
> 'make headers', it doesn't work for me.
>
> I have a ton of output directories and I don't care to build tools into
> the output dirs, in fact some of them flat out refuse to work that way
> (bpf comes to mind)." [1]
>
> Therefore, stop erroring out on the selftests build. Additional patches
> will be required in order to change over to not requiring the kernel
> headers.
>
> [1] https://lore.kernel.org/20231208221007.GO28727@noisy.programming.kicks-ass.net
>
> Cc: Anders Roxell <anders.roxell@...aro.org>
> Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Peter Xu <peterx@...hat.com>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Cc: Shuah Khan <shuah@...nel.org>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
> tools/testing/selftests/Makefile | 21 +----------------
> tools/testing/selftests/lib.mk | 40 +++-----------------------------
> 2 files changed, 4 insertions(+), 57 deletions(-)
>
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 3b2061d1c1a5..8247a7c69c36 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -155,12 +155,10 @@ ifneq ($(KBUILD_OUTPUT),)
> abs_objtree := $(realpath $(abs_objtree))
> BUILD := $(abs_objtree)/kselftest
> KHDR_INCLUDES := -isystem ${abs_objtree}/usr/include
> - KHDR_DIR := ${abs_objtree}/usr/include
> else
> BUILD := $(CURDIR)
> abs_srctree := $(shell cd $(top_srcdir) && pwd)
> KHDR_INCLUDES := -isystem ${abs_srctree}/usr/include
> - KHDR_DIR := ${abs_srctree}/usr/include
> DEFAULT_INSTALL_HDR_PATH := 1
> endif
>
> @@ -174,7 +172,7 @@ export KHDR_INCLUDES
> # all isn't the first target in the file.
> .DEFAULT_GOAL := all
>
> -all: kernel_header_files
> +all:
> @ret=1; \
> for TARGET in $(TARGETS); do \
> BUILD_TARGET=$$BUILD/$$TARGET; \
> @@ -185,23 +183,6 @@ all: kernel_header_files
> ret=$$((ret * $$?)); \
> done; exit $$ret;
>
> -kernel_header_files:
> - @ls $(KHDR_DIR)/linux/*.h >/dev/null 2>/dev/null; \
> - if [ $$? -ne 0 ]; then \
> - RED='\033[1;31m'; \
> - NOCOLOR='\033[0m'; \
> - echo; \
> - echo -e "$${RED}error$${NOCOLOR}: missing kernel header files."; \
> - echo "Please run this and try again:"; \
> - echo; \
> - echo " cd $(top_srcdir)"; \
> - echo " make headers"; \
> - echo; \
> - exit 1; \
> - fi
> -
> -.PHONY: kernel_header_files
> -
> run_tests: all
> @for TARGET in $(TARGETS); do \
> BUILD_TARGET=$$BUILD/$$TARGET; \
> diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk
> index 118e0964bda9..aa646e0661f3 100644
> --- a/tools/testing/selftests/lib.mk
> +++ b/tools/testing/selftests/lib.mk
> @@ -44,26 +44,10 @@ endif
> selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST))))
> top_srcdir = $(selfdir)/../../..
>
> -ifeq ("$(origin O)", "command line")
> - KBUILD_OUTPUT := $(O)
> +ifeq ($(KHDR_INCLUDES),)
> +KHDR_INCLUDES := -isystem $(top_srcdir)/usr/include
> endif
>
> -ifneq ($(KBUILD_OUTPUT),)
> - # Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
> - # expand a shell special character '~'. We use a somewhat tedious way here.
> - abs_objtree := $(shell cd $(top_srcdir) && mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
> - $(if $(abs_objtree),, \
> - $(error failed to create output directory "$(KBUILD_OUTPUT)"))
> - # $(realpath ...) resolves symlinks
> - abs_objtree := $(realpath $(abs_objtree))
> - KHDR_DIR := ${abs_objtree}/usr/include
> -else
> - abs_srctree := $(shell cd $(top_srcdir) && pwd)
> - KHDR_DIR := ${abs_srctree}/usr/include
> -endif
> -
> -KHDR_INCLUDES := -isystem $(KHDR_DIR)
> -
> # The following are built by lib.mk common compile rules.
> # TEST_CUSTOM_PROGS should be used by tests that require
> # custom build rule and prevent common build rule use.
> @@ -74,25 +58,7 @@ TEST_GEN_PROGS := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS))
> TEST_GEN_PROGS_EXTENDED := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_PROGS_EXTENDED))
> TEST_GEN_FILES := $(patsubst %,$(OUTPUT)/%,$(TEST_GEN_FILES))
>
> -all: kernel_header_files $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) \
> - $(TEST_GEN_FILES)
> -
> -kernel_header_files:
> - @ls $(KHDR_DIR)/linux/*.h >/dev/null 2>/dev/null; \
> - if [ $$? -ne 0 ]; then \
> - RED='\033[1;31m'; \
> - NOCOLOR='\033[0m'; \
> - echo; \
> - echo -e "$${RED}error$${NOCOLOR}: missing kernel header files."; \
> - echo "Please run this and try again:"; \
> - echo; \
> - echo " cd $(top_srcdir)"; \
> - echo " make headers"; \
> - echo; \
> - exit 1; \
> - fi
> -
> -.PHONY: kernel_header_files
> +all: $(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED) $(TEST_GEN_FILES)
>
> define RUN_TESTS
> BASE_DIR="$(selfdir)"; \
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