From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 AAAC34A3D3D; Tue, 15 Sep 2026 11:33:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789472029; cv=none; b=XP6DX+NJM2AOGCkVjJYWjiY9zOW6/WRGh7a00sqas7IFygPhSzkFb2SvKcsCXuOq0o3c62HFYudF+hlk1SVJPWLPD0D8y2IKeI2IMN/FIOijb1mSDq3lddB7buQR1YySeRv2zfDcbKs6TlRtwcXF2yBKqBA8kK/JywGyazjxF5E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789472029; c=relaxed/simple; bh=kO5/kQT0XZnIdRnIvngddyYIzT4ZNU9mDakuELDqlrQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=DacD9Ng4heGkj6B2nG/hr5PPizMXXURm+FSt9C9Fg7Bw/nJp2Vpe+7eRoh1Vgjem2lkTJOWYQjoyGX+rxE8hgGrKZXZKnH+6QRGwfT1WcA0L7cB/DNWvEMP9aFBQ3kU5vXo1XviFtueLZAiyKL9H09GBW1cU03vDeAEYLSBn0as= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Nmpj4NaF; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Nmpj4NaF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32EB01F00898; Tue, 15 Sep 2026 11:33:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789472026; bh=fPUeEhZalZFbuqvBU8/iDG2tqjgIH/ueKLGrOGx0E/Q=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=Nmpj4NaFXMtUCUBJkK324vi22fpzvX6uomFULBZJOjhgDQCroZWI/8lb8hRAJVCHh 9EhYq/igSRVSJd0Z69cCAreFakLrT8v7g5ED2rGJFufV7eihjNzGDapElAJqkyWjpl lBXB4AtsKeIiuD1UD4coI3pcXNoLmTr78UlIqOkuglt9Hw0oChJkwnEGg4w0f6UJ0f E3lrRN0G+U0+0MXEDUccPLURv/tGCWrEtzl5wBa6tk79GG6qHRxEjmf3jJK1LMmPo3 /VFHB2tZrT068p2qgHGbLHusKwE8Tye3wqbBTFb6QOLjp++ERuzcM9sRPxtZnWLn1E KgqcMBfnsrMfA== From: Christian Brauner Date: Tue, 15 Sep 2026 13:31:05 +0200 Subject: [PATCH RFC POC 19/50] file: require the syscall exit hook from every architecture Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260915-work-fd-reserve-unify-folded-v1-19-4d5217d6b246@kernel.org> References: <20260915-work-fd-reserve-unify-folded-v1-0-4d5217d6b246@kernel.org> In-Reply-To: <20260915-work-fd-reserve-unify-folded-v1-0-4d5217d6b246@kernel.org> To: Linus Torvalds Cc: Alexander Viro , Jann Horn , Jan Kara , Ingo Molnar , Peter Zijlstra , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Oleg Nesterov , linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, Jens Axboe , io-uring@vger.kernel.org, netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-gpio@vger.kernel.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, bpf@vger.kernel.org, David Airlie , virtualization@lists.linux.dev, kvm@vger.kernel.org, kexec@lists.infradead.org, linux-hyperv@vger.kernel.org, "Christian Brauner (Amutable)" X-Mailer: b4 0.17-dev-db0b7 X-Developer-Signature: v=1; a=openpgp-sha256; l=1044; i=brauner@kernel.org; h=from:subject:message-id; bh=kO5/kQT0XZnIdRnIvngddyYIzT4ZNU9mDakuELDqlrQ=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSt1Kmt7K/PWBxqv33Jx9xZ93feiJvYXvn0wyGRJfor4 xvDgz5O7ChlYRDjYpAVU2RxaDcJl1vOU7HZKFMDZg4rE8gQBi5OAZjImo8M/0t6Hp5cOHfxxr5q 5ZTEWby+CmuzN2gtu/o25VNw3Kl5VQ8Z/ns2bzkbtn3/k1lfb3I0OE2bn/HePMr9P8+ZRZUPSuV nr+YCAA== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Every architecture now either uses the generic entry code or provides TIF_FD_SLOTS. The fallback that deferred without ever committing can go. Make it a build error instead. A new architecture can't grow fd_prepare() callers without the syscall exit hook. Signed-off-by: Christian Brauner (Amutable) --- fs/file.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/file.c b/fs/file.c index 6fa481d63dcf..2b041b45f225 100644 --- a/fs/file.c +++ b/fs/file.c @@ -652,9 +652,7 @@ static void fd_release(unsigned int fd) #define fd_slots_set_work() set_thread_flag(TIF_FD_SLOTS) #define fd_slots_clear_work() clear_thread_flag(TIF_FD_SLOTS) #else -/* Nothing commits until the architecture provides the flag. */ -#define fd_slots_set_work() do { } while (0) -#define fd_slots_clear_work() do { } while (0) +#error "the syscall exit path must commit prepared file descriptors" #endif static struct fd_slot *fd_slot(struct fd_slots *slots, unsigned int idx) -- 2.53.0