From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wr1-f44.google.com (mail-wr1-f44.google.com [209.85.221.44]) (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 5B7891C5F23 for ; Wed, 17 Sep 2025 05:56:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.44 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758088599; cv=none; b=kLIXYRxLVnn0ikGmi8C/w5fOu7IZAYyr9iur0vXilsk41F0ncMhwh6z3W7q54INNUKnZJNtrID39dDxO4MIwun0VAXDkSqAMHvDwSMz0gsJJ1mIVVkdssQpMprs4N602qTOBl6h4zfWttzK3dgYcZJE9/MhV+IYfStF9F4b/Xnk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758088599; c=relaxed/simple; bh=HEAtg16SjSSpTPSJTLyQUgy2jQeNKW9e6mUD3MY3hAM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=qTPabAki3VvrGnvDnl+v2vUemWxocXXA0rYC1pr3FeoopnaM3Bkzro+7ZAToywZ/hegJYq+FukfUaXza/CoTAK0xuaHhTGH6qCEZ86u58EUfLoOFAILXHoHMqMa+rDA/akHxgBuZRxF5S22vep7FftN8azGnqbnIoD4gKfaDl8Q= 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=209.85.221.44 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-f44.google.com with SMTP id ffacd0b85a97d-3e9042021faso2534903f8f.3 for ; Tue, 16 Sep 2025 22:56:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758088596; x=1758693396; 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=4rL2rlM29fREnsY3UP4GCd3w0RbbtqI2tzuuAuaZNNM=; b=fwJvhdm421lkUZ+m7QrSDk2cMA6zPSsOY+1nS3gFhz7fCeaqqWvKZdn9xm9R7cVwJw erDRsLmw3MbL4Y+QdjIdfYmuIgV1fttml+wG2sUREU4c2k//4l5x5MqZ29bSPpycYkPT u45ufrrUyz4bWKCBn9f1fMZ6JcjM1TYcThuBpdcX4bVEEUKIS5C59s9Q9m8TxvDYRCby N2DR+6MpGu1l35hgs1ET7mdEjEyZPK6hXpwQxyfBgJKSN7QVB8bUuClX3DHinTYinBdK cvtcedzuY5NT1HUtX6H83IITrVf/9guyTWoLcLI3OEeDUAGS6DkYHK+nVHaNKICis2g+ n+jg== X-Forwarded-Encrypted: i=1; AJvYcCUXrJUoW14jIkfMosHHpqT3m5NbB/VVRkR2KoCinorDhJKxoc857/T4bKpH+2ooJ382VsGDDjb2Luj/KGwr6xY=@vger.kernel.org X-Gm-Message-State: AOJu0YyFXBa80wUBgEbR3wyeqQSCwI1CUzttK8jgL2HNvSSM3/iMRV3F /IB4US0qBUk9K26IwbzyF9s/lmjFtVXnVLw5W8L1Nbx/xY9scDNLRulpYuekUw== X-Gm-Gg: ASbGncsDqhJNVfQiCxw0Lya/SH/fkCcDoL3dkPtN8jX74E9B0hNZWV3ReOaaERgb5wK 7PCnm2kUc26Elpmw95rSq5+ZARdNR7+qJmr9Ix7LLDcoxjbpDKb7VKMEgx/XNyqE0afyEyWGcil xEMng/ImquXdT03aGk3kfdFmJpgCtXY0uu35dfoNez/iSO4C34R2U67UIi6Ym8qG/a5GTUJ+2HD qJU+BEVkw+jmxnursyCTxPOT1YvMyJ+uhcWMGgaiWvaEID/9nJf2Gmgik8Y/Sk5rVDHY1tmRIbT fZjPI1yOCilqexCG19tVkAZFC/yqrJqkuNi4aVbQ5zFkouXtfhyY+JlH9uTg/preJoQXK3ANdxq hdg+zCOQd X-Google-Smtp-Source: AGHT+IGjxHPHG8T6fPu431Ka9rSzcuna7td6QNzojHq1qsMru8NT7pUxzrEnuuQd7KWe/4SL2weFmQ== X-Received: by 2002:a5d:64c8:0:b0:3ea:e0fd:28ea with SMTP id ffacd0b85a97d-3ecdfa0d2e6mr682457f8f.39.1758088595501; Tue, 16 Sep 2025 22:56:35 -0700 (PDT) Received: from EBJ9932692.tcent.cn ([2a09:0:1:2::3086]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3ecdf0bbf24sm1433237f8f.63.2025.09.16.22.56.32 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 16 Sep 2025 22:56:34 -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 1/1] selftests/mm: skip soft-dirty tests when CONFIG_MEM_SOFT_DIRTY is disabled Date: Wed, 17 Sep 2025 13:56:22 +0800 Message-ID: <20250917055622.46564-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kselftest@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_is_supported() into vm_util.c/h to ensure tests are properly skipped when the feature is not enabled. Signed-off-by: Lance Yang --- tools/testing/selftests/mm/madv_populate.c | 21 ++-------------- tools/testing/selftests/mm/soft-dirty.c | 5 +++- tools/testing/selftests/mm/vm_util.c | 28 ++++++++++++++++++++++ tools/testing/selftests/mm/vm_util.h | 1 + 4 files changed, 35 insertions(+), 20 deletions(-) diff --git a/tools/testing/selftests/mm/madv_populate.c b/tools/testing/selftests/mm/madv_populate.c index b6fabd5c27ed..43dac7783004 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_is_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_is_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..98e42d2ac32a 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_is_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..3173335df775 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -449,6 +449,34 @@ bool check_vmflag_pfnmap(void *addr) return check_vmflag(addr, "pf"); } +bool softdirty_is_supported(void) +{ + char *addr; + int ret = 0; + size_t pagesize; + + /* We know for sure that arm64 does not support soft-dirty. */ +#if defined(__aarch64__) + return ret; +#endif + pagesize = getpagesize(); + /* + * __mmap_complete() always sets VM_SOFTDIRTY for new VMAs, so we + * just mmap a small region and check its VmFlags in /proc/self/smaps + * for the "sd" flag. + */ + 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")) + ret = 1; + + munmap(addr, pagesize); + return ret; +} + /* * 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..87ad8e0d92c0 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_is_supported(void); static inline int open_self_procmap(struct procmap_fd *procmap_out) { -- 2.49.0