+ selftests-mm-suppress-compiler-error-in-liburing-check.patch added to mm-new branch

+ selftests-mm-suppress-compiler-error-in-liburing-check.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: selftests/mm: suppress compiler error in liburing check
has been added to the -mm mm-new branch.  Its filename is
     selftests-mm-suppress-compiler-error-in-liburing-check.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-suppress-compiler-error-in-liburing-check.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

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and is updated there most days

------------------------------------------------------
From: Li Wang <wangli.ahau@gmail.com>
Subject: selftests/mm: suppress compiler error in liburing check
Date: Wed, 22 Apr 2026 16:04:46 +0800

When building the mm selftests on a system without liburing development
headers, check_config.sh leaks a raw compiler error:

  /tmp/tmp.kIIOIqwe3n.c:2:10: fatal error: liburing.h: No such file or directory
      2 | #include <liburing.h>
        |          ^~~~~~~~~~~~

Since this is an expected failure during the configuration probe,
redirect the compiler output to /dev/null to hide it.

And the build system prints a clear warning when this occurs:

  Warning: missing liburing support. Some tests will be skipped.

Because the user is properly notified about the missing dependency, the
raw compiler error is redundant and only confuse users.

Additionally, update the Makefile to use $(Q) and $(call msg,...) for the
check_config.sh execution.  This aligns the probe with standard kbuild
output formatting, providing a clean "CHK" message instead of printing the
raw command during the build.

Link: https://lore.kernel.org/20260422080446.26020-3-wangli.ahau@gmail.com
Signed-off-by: Li Wang <wangli.ahau@gmail.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 tools/testing/selftests/mm/Makefile        |    3 ++-
 tools/testing/selftests/mm/check_config.sh |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/mm/check_config.sh~selftests-mm-suppress-compiler-error-in-liburing-check
+++ a/tools/testing/selftests/mm/check_config.sh
@@ -16,7 +16,7 @@ echo "#include <sys/types.h>"        > $
 echo "#include <liburing.h>"        >> $tmpfile_c
 echo "int func(void) { return 0; }" >> $tmpfile_c
 
-$CC $CFLAGS -c $tmpfile_c -o $tmpfile_o
+$CC $CFLAGS -c $tmpfile_c -o $tmpfile_o >/dev/null 2>&1
 
 if [ -f $tmpfile_o ]; then
     echo "#define LOCAL_CONFIG_HAVE_LIBURING 1"  > $OUTPUT_H_FILE
--- a/tools/testing/selftests/mm/Makefile~selftests-mm-suppress-compiler-error-in-liburing-check
+++ a/tools/testing/selftests/mm/Makefile
@@ -263,7 +263,8 @@ $(OUTPUT)/migration: LDLIBS += -lnuma
 $(OUTPUT)/rmap: LDLIBS += -lnuma
 
 local_config.mk local_config.h: check_config.sh
-	CC="$(CC)" CFLAGS="$(CFLAGS)" ./check_config.sh
+	$(call msg,CHK,config,$@)
+	$(Q)CC="$(CC)" CFLAGS="$(CFLAGS)" ./check_config.sh
 
 EXTRA_CLEAN += local_config.mk local_config.h
 
_

Patches currently in -mm which might be from wangli.ahau@gmail.com are

selftests-mm-respect-build-verbosity-settings-for-32-64-bit-targets.patch
selftests-mm-suppress-compiler-error-in-liburing-check.patch