From nobody Fri Apr 3 20:53:42 2026 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0F16E3890F6 for ; Mon, 23 Mar 2026 10:02:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.2 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774260144; cv=none; b=szOORH8HRMUgQC+7uzFgNRAfCppEnS4wO4clwUcRgMiMKqpvlyN3W6jaUNgQVWHG66H97q+UY9AJJRA4wLh0X8AVz++NLWxFKfjGRC4q3/4u2Ur48bAK7AXUk4l43UgjAdA85FY6vhigrcfqhFALFwekqwQCtiIIIXK1F7pxeL4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774260144; c=relaxed/simple; bh=McXAJpMWCeysJ4sn0byFtcn2D7Sdq7U0aZzsvpEIFXM=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=h8wokEcZYsOvSF4/lCAXPdKhkFGJbjC922ApTPbMhM80nsI8j+NRPhcj8B+kqB8q9e22sjjcORxN04k2RF+MLoXgmPaiWrjxu6VB4l9dCu+JrXfnee5Qe5O3/NKLBQgq8EB2ZBx3ScZ1/mEJ7xuiEihCKst9/ZaSNR1L240YtWs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=Fg2B7PIE; arc=none smtp.client-ip=220.197.31.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="Fg2B7PIE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=Po pT/7zarkgfUDqfkGIlFWmXtxsepW94GZLQJo5wPA4=; b=Fg2B7PIE1bhCpegXzA Mt5Ur29dF4rOEVsUj5M9bp+OgKBWEPYRJmjgpEXOkdhD7iCmVE0jrlPGTKuXH/RR e+vxWMN4zZyYjp2st6o2xzN11lROoo/82srKHybuwxYscvYSd8PO2ccU2RI+goAP zCww8W8ljeJgg91Dt7VBXlXxo= Received: from zhaoxin-MS-7E12.. (unknown []) by gzsmtp5 (Coremail) with SMTP id QCgvCgAnRXddD8FpLM3LTg--.143S2; Mon, 23 Mar 2026 18:01:04 +0800 (CST) From: Xin Zhao To: tglx@linutronix.de, peterz@infradead.org, akpm@linux-foundation.org, bigeasy@linutronix.de Cc: linux-mm@kvack.org, kuba@kernel.org, linux-kernel@vger.kernel.org, jackzxcui1989@163.com Subject: [PATCH] mm/fault, arch: faulthandler_disabled() also check irqs_disabled() Date: Mon, 23 Mar 2026 18:01:00 +0800 Message-Id: <20260323100100.1031582-1-jackzxcui1989@163.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: QCgvCgAnRXddD8FpLM3LTg--.143S2 X-Coremail-Antispam: 1Uf129KBjvdXoW7Wr1UXryfur47Cr18ZFWUArb_yoWkXrX_Wa y8Ja1DCF45ZrZ7Ar12qFn2yrySg340qF48XFn5Ww13Kr9xJws8Kws3JrZ5ur43XF1IvF4f Ww4DGryfWr4SgjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRCzuW3UUUUU== X-CM-SenderInfo: pmdfy650fxxiqzyzqiywtou0bp/xtbCvwCmsGnBD2BhIQAA3u Content-Type: text/plain; charset="utf-8" in_atomic() cannot determine whether it is in a context where interrupts are disabled. In a context with interrupts disabled, sleeping is not allowed. Page fault handling may lead to sleeping, which can cause issues. faulthandler_disabled() checks irqs_disabled() to avoid this situation. Signed-off-by: Xin Zhao --- include/linux/uaccess.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h index 1f3804245..71fea4497 100644 --- a/include/linux/uaccess.h +++ b/include/linux/uaccess.h @@ -305,7 +305,7 @@ static inline bool pagefault_disabled(void) * !CONFIG_PREEMPT_COUNT, this is like a NOP. So the handler won't be disa= bled. * in_atomic() will report different values based on !CONFIG_PREEMPT_COUNT. */ -#define faulthandler_disabled() (pagefault_disabled() || in_atomic()) +#define faulthandler_disabled() (pagefault_disabled() || in_atomic() || ir= qs_disabled()) =20 DEFINE_LOCK_GUARD_0(pagefault, pagefault_disable(), pagefault_enable()) =20 --=20 2.34.1