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Tue, 31 Mar 2026 04:02:18 +0000 (UTC) Received: from fedora-laptop-x1.redhat.com (unknown [10.72.112.121]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 56EEC30001A1; Tue, 31 Mar 2026 04:02:13 +0000 (UTC) From: Li Wang To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, Liam.Howlett@oracle.com, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/4] selftests/lib.mk: set PWD from CURDIR to avoid wrong extmod path Date: Tue, 31 Mar 2026 12:01:55 +0800 Message-ID: <20260331040156.119158-3-liwang@redhat.com> In-Reply-To: <20260331040156.119158-1-liwang@redhat.com> References: <20260331040156.119158-1-liwang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Mimecast-MFC-PROC-ID: Ji5aUdrxfN4L8Awi5rdwpigiSYxf3gDd3jssCGZzKmQ_1774929738 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: 49094180012 X-Stat-Signature: rmow44umsf9nt8o54mdaydhimifj7te6 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1774929748-887046 X-HE-Meta: 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 E81qLR7+ 2189QqxkUAoIw0oXtEEUS5cqHH1Y90LZuK6yLKI0sRdIroH1tnxf7Xhew2moxsTbRCTsx/c0kjNwpPW5OO4eslJaEDf0SG4zydJRguxgISqke7gKkOQYLWwdNMEmXuL8fmTeSYhwVDn40iVS+euJ5CEWt9j6NW2UgxMnrGZN7z8hbl/oVl/77Vg7LqoigGqVZcn6wDzOWfLk4Kab5jCGX5R4RqdkxSBUytkeKPgS2g0/V9+DY30ptl4lnkti13pqRme0w+kWOLrAayF2/rXH4z5106mjOeffq7+YWMYjbGnDadrPEuaQns8VaZprAyX84Z08+4GcYg69e6pkDXjGWgzfF+lrEB2idnwrqmnGhNY4q2HAaPgZwZOaATV7nwmka9BfVT/lXAU2Md9B2rEUmLeQZaQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When running selftests from the kernel top-level (e.g. make kselftest-all), sub-makes might still inherit the caller's PWD from the environment. Some selftests use $(PWD) in recursive kbuild invocations, which can then incorrectly resolve to the kernel top directory instead of the current test directory. In that case, kbuild may generate an external-module wrapper Makefile in the wrong location, potentially clobbering the top-level Makefile and causing recursive include failures ("Too many open files"). Export PWD := $(CURDIR) in selftests/lib.mk so $(PWD) always matches the actual current selftest directory. Reported-by: Andrew Morton Signed-off-by: Li Wang --- tools/testing/selftests/lib.mk | 2 ++ tools/testing/selftests/mm/local_config.stamp | 0 2 files changed, 2 insertions(+) create mode 100644 tools/testing/selftests/mm/local_config.stamp diff --git a/tools/testing/selftests/lib.mk b/tools/testing/selftests/lib.mk index f02cc8a2e4ae..2840e98c225c 100644 --- a/tools/testing/selftests/lib.mk +++ b/tools/testing/selftests/lib.mk @@ -60,6 +60,8 @@ endif selfdir = $(realpath $(dir $(filter %/lib.mk,$(MAKEFILE_LIST)))) top_srcdir = $(selfdir)/../../.. +export PWD := $(CURDIR) + # msg: emit succinct information message describing current building step # $1 - generic step name (e.g., CC, LINK, etc); # $2 - optional "flavor" specifier; if provided, will be emitted as [flavor]; diff --git a/tools/testing/selftests/mm/local_config.stamp b/tools/testing/selftests/mm/local_config.stamp new file mode 100644 index 000000000000..e69de29bb2d1 -- 2.53.0