From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f52.google.com (mail-wr1-f52.google.com [209.85.221.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 669A2337E90 for ; Wed, 17 Sep 2025 12:28:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.52 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758112096; cv=none; b=DRlbG2btNYNZ8pSgM0mmq8nKipVuufl7xPBrCku9zBP5MwwVvALsH16PqR/ABOkyU1InknYquiK8HZe6rQUBMTlrIF0odvlRIdt1F33GCfbB7Z1S5vKhcda9y+iPGTW2sB6sriNMMX7dfwa4YaIeaRQkurh3Um2QvSXu0LUqYQA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758112096; c=relaxed/simple; bh=p0eLd5FnxaTnLyJGUpKveSeYoTasHRMKbTQN6xHgLyg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=p/+LA/0jQj+Mm6e8WfdpmqHnPxmCRC5cD+u58gmEXiU0xAX3FDAhaic9h4l4yqDWbvQdTIBZ3vGxpQgb+IyrPTCDLTyyiM5JahH/1GhaQlFH7bFhLTJwR6o5lEOdpwM7Oopj63UyVRWuZ73rz5bZnailY8Qj9be4pa9EsKdiZQQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.221.52 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-wr1-f52.google.com with SMTP id ffacd0b85a97d-3df15fdf0caso5268336f8f.0 for ; Wed, 17 Sep 2025 05:28:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758112092; x=1758716892; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=qD2fpIrArmTyZxxLn48nFl6F/9cW6IoNw/VXQ+AiGyg=; b=Nz3kikGTStOHegXPDt2Mp0dUgHtx541xz2xcbXLV2Lo6QsLEUvSbbDQvmxgLHo3sk/ DbhvBG0nYjRxe79quJlMOZKcjZU3yzQczw97uGb1fzjz+vBeKeQFzmCJhlWMFWN8tZcN r1eaPsJ1S8s36m7cmIiYmQNHmB4BYvClYSHAj+xB6E1fwfViu5N91F8HeLRgE8kyS0wY 3H0M1Fj5BsEO8tGq2egiLIgzJ0LASRKw6ATTTNTZsEpImY9ig/hqNML1Gy6LmOxc8qnQ YsblnFkSii4f0sRIbHKZrKZG7mJhSOszmZ33px/e+vK4HJRoWt7OlmjIf9GfxBqDUlJU T1ug== X-Forwarded-Encrypted: i=1; AJvYcCWcMp78gq/HHIO8kgaUImQLiUuzG/JsAIpoiH7DxVCC0+rI4x3MYLTAYWJ9zKPClbXF4zIF4sTl3gnYkYE=@vger.kernel.org X-Gm-Message-State: AOJu0YxkoLEfEu3q/KovzZMxP6LFHDdyhKu/4s2Rrm6WPnco+QV+5XPM dGV7nRsj7U1+I9YRdwGNL56eJp46mCHs/9eyKK8B52BeAOd2IeEJ6RLQ X-Gm-Gg: ASbGncu7fnaC4z+vEr1J9TW0c2SZzaCrKdh0sdElznFrTVnxdppdE6o2enHn5p8dnDh cWjyiTgn3eDNqosF786jq8hjgv9+vBZE6d/0cDK5KEpS4uO20y+ZicdZ/4Vl01M6dXCZtKR0qwA P+Jf1AmJeyvDgZ2nsGAZEtQ2bJw6hX6HD2Anj5e3MUNdVlkONaNzEPIFRdM26ehUcYQwZkgjP42 HkM4leXoeGMyBn0gunP94X1W6VaXi1WnpyzjAcOBqPSIMdizZ6TFXuioLG/rLLGxMkMApcvDtvE XtVwoFw63RBmIdpb9WSNz7QE3H/Gm2qyPPDDkKEcDjab3e/MFdUhuggbkQp75pDZvj2O1Zx+e03 9KYi2CgGs X-Google-Smtp-Source: AGHT+IEhRdB7nBids5w22yMAJVOTFKi7URkF3KNMkIzMofyDJUedOPZhjL9ZUsgPqYsxBt2TT+mIxw== X-Received: by 2002:a05:6000:2313:b0:3ea:6680:8fa3 with SMTP id ffacd0b85a97d-3ecdfa35214mr1949003f8f.42.1758112091433; Wed, 17 Sep 2025 05:28:11 -0700 (PDT) Received: from EBJ9932692.tcent.cn ([2a09:0:1:2::3086]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e911188fb9sm16275658f8f.28.2025.09.17.05.28.08 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 17 Sep 2025 05:28:10 -0700 (PDT) From: Lance Yang To: akpm@linux-foundation.org, david@redhat.com, lorenzo.stoakes@oracle.com Cc: shuah@kernel.org, ioworker0@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Lance Yang Subject: [PATCH v2 1/1] selftests/mm: skip soft-dirty tests when CONFIG_MEM_SOFT_DIRTY is disabled Date: Wed, 17 Sep 2025 20:27:50 +0800 Message-ID: <20250917122750.36608-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Lance Yang The madv_populate and soft-dirty kselftests currently fail on systems where CONFIG_MEM_SOFT_DIRTY is disabled. Introduce a new helper softdirty_supported() into vm_util.c/h to ensure tests are properly skipped when the feature is not enabled. Signed-off-by: Lance Yang --- v1 -> v2: - Rename softdirty_is_supported() to softdirty_supported() (per David) - Drop aarch64 specific handling (per David) - https://lore.kernel.org/lkml/20250917055913.49759-1-lance.yang@linux.dev tools/testing/selftests/mm/madv_populate.c | 21 ++------------------- tools/testing/selftests/mm/soft-dirty.c | 5 ++++- tools/testing/selftests/mm/vm_util.c | 19 +++++++++++++++++++ tools/testing/selftests/mm/vm_util.h | 1 + 4 files changed, 26 insertions(+), 20 deletions(-) diff --git a/tools/testing/selftests/mm/madv_populate.c b/tools/testing/selftests/mm/madv_populate.c index b6fabd5c27ed..d8d11bc67ddc 100644 --- a/tools/testing/selftests/mm/madv_populate.c +++ b/tools/testing/selftests/mm/madv_populate.c @@ -264,23 +264,6 @@ static void test_softdirty(void) munmap(addr, SIZE); } -static int system_has_softdirty(void) -{ - /* - * There is no way to check if the kernel supports soft-dirty, other - * than by writing to a page and seeing if the bit was set. But the - * tests are intended to check that the bit gets set when it should, so - * doing that check would turn a potentially legitimate fail into a - * skip. Fortunately, we know for sure that arm64 does not support - * soft-dirty. So for now, let's just use the arch as a corse guide. - */ -#if defined(__aarch64__) - return 0; -#else - return 1; -#endif -} - int main(int argc, char **argv) { int nr_tests = 16; @@ -288,7 +271,7 @@ int main(int argc, char **argv) pagesize = getpagesize(); - if (system_has_softdirty()) + if (softdirty_supported()) nr_tests += 5; ksft_print_header(); @@ -300,7 +283,7 @@ int main(int argc, char **argv) test_holes(); test_populate_read(); test_populate_write(); - if (system_has_softdirty()) + if (softdirty_supported()) test_softdirty(); err = ksft_get_fail_cnt(); diff --git a/tools/testing/selftests/mm/soft-dirty.c b/tools/testing/selftests/mm/soft-dirty.c index 8a3f2b4b2186..4ee4db3750c1 100644 --- a/tools/testing/selftests/mm/soft-dirty.c +++ b/tools/testing/selftests/mm/soft-dirty.c @@ -200,8 +200,11 @@ int main(int argc, char **argv) int pagesize; ksft_print_header(); - ksft_set_plan(15); + if (!softdirty_supported()) + ksft_exit_skip("soft-dirty is not support\n"); + + ksft_set_plan(15); pagemap_fd = open(PAGEMAP_FILE_PATH, O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_msg("Failed to open %s\n", PAGEMAP_FILE_PATH); diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 56e9bd541edd..ac41d10454a5 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -449,6 +449,25 @@ bool check_vmflag_pfnmap(void *addr) return check_vmflag(addr, "pf"); } +bool softdirty_supported(void) +{ + char *addr; + bool supported = false; + const size_t pagesize = getpagesize(); + + /* New mappings are expected to be marked with VM_SOFTDIRTY (sd). */ + addr = mmap(0, pagesize, PROT_READ | PROT_WRITE, + MAP_ANONYMOUS | MAP_PRIVATE, 0, 0); + if (!addr) + ksft_exit_fail_msg("mmap failed\n"); + + if (check_vmflag(addr, "sd")) + supported = true; + + munmap(addr, pagesize); + return supported; +} + /* * Open an fd at /proc/$pid/maps and configure procmap_out ready for * PROCMAP_QUERY query. Returns 0 on success, or an error code otherwise. diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index 07c4acfd84b6..26c30fdc0241 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -104,6 +104,7 @@ bool find_vma_procmap(struct procmap_fd *procmap, void *address); int close_procmap(struct procmap_fd *procmap); int write_sysfs(const char *file_path, unsigned long val); int read_sysfs(const char *file_path, unsigned long *val); +bool softdirty_supported(void); static inline int open_self_procmap(struct procmap_fd *procmap_out) { -- 2.49.0