Re: [PATCH] tools/dma: fix building from the top level with O=

[Qinxin Xia <xiaqinxin@huawei.com>]

On 2026/10/12 06:33:32, Sasha Levin <sashal@kernel.org> wrote:
> "make O=<dir> tools/dma" fails:
> 
>    Makefile:27: /tools/build/Makefile.include: No such file or directory
> 
> tools/Makefile clears srctree, and the dma Makefile only works it out
> again when building_out_of_srctree is not set, which the top-level
> Makefile sets for O= builds.
> 
> Also work out srctree when it is empty, as tools/bpf/Makefile does
> since commit a89b2cbf71d64 ("tools, bpf: Fix build for 'make -s
> tools/bpf O=<dir>'").
> 
> Fixes: f74ee32963f1b ("tools/dma: move dma_map_benchmark from selftests to tools/dma")
> Cc: stable@vger.kernel.org
> Assisted-by: LLM
> Signed-off-by: Sasha Levin <sashal@kernel.org>
> ---
>   tools/dma/Makefile | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/tools/dma/Makefile b/tools/dma/Makefile
> index 0c239a6b9eae5..20ae7f09cd206 100644
> --- a/tools/dma/Makefile
> +++ b/tools/dma/Makefile
> @@ -7,7 +7,13 @@ bindir ?= /usr/bin
>   # isn't set and when invoked from selftests build, where srctree
>   # is set to ".". building_out_of_srctree is undefined for in srctree
>   # builds
> +ifeq ($(srctree),)
> +update_srctree := 1
> +endif
>   ifndef building_out_of_srctree
> +update_srctree := 1
> +endif
> +ifeq ($(update_srctree),1)
>   srctree := $(patsubst %/,%,$(dir $(CURDIR)))
>   srctree := $(patsubst %/,%,$(dir $(srctree)))
>   endif

Acked-by: Qinxin Xia <xiaqinxin@huawei.com>
-- 
Thanks,
Qinxin