From nobody Tue Feb 10 15:43:24 2026 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (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 21A011442F3 for ; Mon, 8 Apr 2024 21:52:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712613158; cv=none; b=bMnxpuMB7jn/fYDO4lJBZyaqfWcfI2v/jdJNLnf+pxqHV/R3otNN7WmiBeSVog+wPwHdgfxITvUhrxXL0SDSml2xJ2a8U6jjCbc9nnv9U+Ar9RmYRtZpUxthie4RlXtNX2zjHHjAQ0xOF2fOg9KwALfJDeTgoteSg2aSg9JaYco= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712613158; c=relaxed/simple; bh=nvpM8tXyK/CURoTjuw83DuYMKwJ9CyjRJDN6oCQ+WcM=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=rPMlj8DPgvA6VrR/cw+M53jrKN5k9cpnJ0pBvQ1DS9yin69sllS0lgoY1IEjA36rJtDiZZNR7eDPuqFmvT1NNi8XACDXFlxjkI3uDxlgCJouxFdkCJ4TM+kSz1jcqUT0ytd8cpgSWO4zNDBdN/htOAC+CERq/SDWiGg64zYXxuQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--dhavale.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=KFTehzjZ; arc=none smtp.client-ip=209.85.128.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--dhavale.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="KFTehzjZ" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-61506d6d667so84903427b3.1 for ; Mon, 08 Apr 2024 14:52:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1712613156; x=1713217956; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=amcZSzW3yyTzEXypL37TcjBNZBV4M3dWgOvIguTbuzI=; b=KFTehzjZWAYt/par8SOgZJrE6uQ7QnRoaIeo1W6zXkM/3vv17gRR8exgPPpaXIsh9l 7SHnq9H/+ZkMzn9lYDlsM7Z33ZeT+HUfbIA/OLmi6PTlRR1zuKfboNs8uFNNZqk6YW+v VgCWq47v3o0c88gEc6nlR1dO/HpnplipYCAT5v4LNiQTIUA/T7vsXxC49c3cpfDHXpyd FMUQ6sdjfWRJ10vd+r0RWBVEurVBSqrOIAIZ+RoKgFaYo2OGjtlEe2lH1iHuEI39/Y7o Nk91oi5ry9ANeV53K6QbwK6/yAiKIAOZI0l1mSVPz7IjfeLfu0N4/4V1f6+RGqRJq8y0 IodA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1712613156; x=1713217956; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=amcZSzW3yyTzEXypL37TcjBNZBV4M3dWgOvIguTbuzI=; b=tXpRt2oKYttLh5lKOW8wFpVfYD6E8XMlNj4ODZHCMXE36TYddYrlmMO+Ji9VAPhsCl BmcK4LFMLQGoylNzm1QIUJEA8hdbqJVpLxxw6O07AmTCYah6IxizXj9euFsyrOhkTt6N sTt5dyeoylPD8NZeYCGvsCPIy6O2TyRuY71nDnk7iJXmgBS/upIJVxTWxlDE/RcWWNPu b1og5qj+niAxF6BJYuZ7IRFaJEP8hLMTGyLABzPauHCttvwGavZG7L71Uwf/Emjgnz2e 5lKWlCSiHpmUk6e/my8kcVeZTNJQUGAmqKozGzYcdfFMO8PtHkLMU903OJSs2a3cyfm2 uVxA== X-Forwarded-Encrypted: i=1; AJvYcCU4O5/HndATFQKc6Se9hAfxOgvaVyG8ef9AePO23RBrzPI/EM+n9ghjIs537AlCld/Xt4aHX2yOB5mtEiGtQP/hWMiJ7zuXH/P28/2o X-Gm-Message-State: AOJu0YxuMLohkh05XWzdP+dzkbtITJ/09v0wT5vmyxwTA0wlEwDTkr0d AZRdSv0HiuPaHD1IHFE15PWXUS1MgyBN7Pc1qYLt0GXeHabMA+43axinsAaDMwIZlNAv8ly3wT7 TrbIccw== X-Google-Smtp-Source: AGHT+IEkq+yrPhgyYDRCrGfUbGremKSvF9Tls/NyM9Ex8fLO1ww0uaL+bHkVzWJv2HGc6KYIwiPvmzeEyS36 X-Received: from dhavale-desktop.mtv.corp.google.com ([2620:15c:211:201:9081:5db7:4b17:a606]) (user=dhavale job=sendgmr) by 2002:a81:ff05:0:b0:615:12a5:49c9 with SMTP id k5-20020a81ff05000000b0061512a549c9mr2538367ywn.3.1712613156122; Mon, 08 Apr 2024 14:52:36 -0700 (PDT) Date: Mon, 8 Apr 2024 14:52:29 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.44.0.478.gd926399ef9-goog Message-ID: <20240408215231.3376659-1-dhavale@google.com> Subject: [PATCH v1] erofs: use raw_smp_processor_id() to get buffer from global buffer pool From: Sandeep Dhavale To: Gao Xiang , Chao Yu , Yue Hu , Jeffle Xu , Sandeep Dhavale , Chunhai Guo Cc: linux-erofs@lists.ozlabs.org, syzbot+27cc650ef45b379dfe5a@syzkaller.appspotmail.com, kernel-team@android.com, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" erofs will decompress in the preemptible context (kworker or per cpu thread). As smp_processor_id() cannot be used in preemptible contexts, use raw_smp_processor_id() instead to index into global buffer pool. Reported-by: syzbot+27cc650ef45b379dfe5a@syzkaller.appspotmail.com Fixes: 7a7513292cc6 ("erofs: rename per-CPU buffers to global buffer pool a= nd make it configurable") Signed-off-by: Sandeep Dhavale --- fs/erofs/zutil.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/erofs/zutil.c b/fs/erofs/zutil.c index b9b99158bb4e..036024bce9f7 100644 --- a/fs/erofs/zutil.c +++ b/fs/erofs/zutil.c @@ -30,7 +30,7 @@ static struct shrinker *erofs_shrinker_info; =20 static unsigned int z_erofs_gbuf_id(void) { - return smp_processor_id() % z_erofs_gbuf_count; + return raw_smp_processor_id() % z_erofs_gbuf_count; } =20 void *z_erofs_get_gbuf(unsigned int requiredpages) --=20 2.44.0.478.gd926399ef9-goog