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 5E4514A64DC; Tue, 15 Sep 2026 11:32:22 +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=1789471943; cv=none; b=g1GKvAaJDyqStm9nFil98KTUSvTZs2Sz3pdbv8AiuHjsPEOYtyF8TxRpbUkfBgg85yGmXFniwDcBYknMVbg8BxDbuaSMri1rviKnjPwBS14z2NcOE+RubXpr3lrLm8UPa/BSwBDopg++eSsnMRqdgiFd0RQbZT20pOG6+Wg2rPE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789471943; c=relaxed/simple; bh=Bf/Nt9MIp5BYByx3VQiEgkxrXuUu+w3TElLZR1b5xXU=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=loE1XY1yFpffX9vAYuCPUjWz4zgnrhDqKa3Rc+GDivA31S8kU650M0CLVCJnNJmV4rDOnEUOqdp3mZcOZjzG5cwkCNLz6uNOCikC3E/3d07pVf/dkp1XKXep/zhenJr3Y3bamXSGikKCKbYv5oXOAxdVKjVkIfK+CwwB0AlQjt0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KsZ0YSeM; 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="KsZ0YSeM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4D2C1F00898; Tue, 15 Sep 2026 11:32:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789471942; bh=sj/TXeU8lbnq/VrgmP1w7bpiu8kxbau6iQA5smJm308=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=KsZ0YSeM3U31KwXzuSOBPVbLhE9vK4Yxa17kxnYE4VLLcBpXFBViJ7MpY18d0q6fg Dlkn+mjs3MbZWkyHFiqCn2El/got/SWIrC3Q6gwcviuJR1/ai315fCDOEzDtjnFUA+ ERro30MRjCev/KMJgcrZtL2o1gUZZKhbA8HyLbu41oPLd1EatgWYME4stynmbpZ0mz K2X3JgB7AebymzKvLiHCEwmgdxwueAGGvA/T8oKFv3D8nL35LXrTyGPgC1/a4X9Lk0 vYiOSTed74edj4byJ8eheDQrzWMKeMINNC4B6wsUI+361fX0pdzSzZSfMUdSTok96o JldIOwL5KHMLA== From: Christian Brauner Date: Tue, 15 Sep 2026 13:30:54 +0200 Subject: [PATCH RFC POC 08/50] hexagon: commit fds on syscall exit 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-v1-8-4d5217d6b246@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=2326; i=brauner@kernel.org; h=from:subject:message-id; bh=Bf/Nt9MIp5BYByx3VQiEgkxrXuUu+w3TElLZR1b5xXU=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSt1KlxSfoWG7jlfrZ0K0tn4qOUcP+ecLZEh3DTGxwiP //KiUzqKGVhEONikBVTZHFoNwmXW85TsdkoUwNmDisTyBAGLk4BmMieN4wMd9vcWj+ZhdjGz730 0Td4Qozfzkm7T2q1yV5i3fu0zPsfNyPDAc8V881XLgs7f0Ke7TKroLtaVRyno/+PV+zTfzPk3mr iBAA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Add TIF_FD_SLOTS and test it in do_trap0() once the system call has returned, before the ptrace exit stop gets to see the result. Signed-off-by: Christian Brauner (Amutable) --- arch/hexagon/include/asm/thread_info.h | 2 ++ arch/hexagon/kernel/traps.c | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/arch/hexagon/include/asm/thread_info.h b/arch/hexagon/include/asm/thread_info.h index e90f280b9ce3..8558d2d147f8 100644 --- a/arch/hexagon/include/asm/thread_info.h +++ b/arch/hexagon/include/asm/thread_info.h @@ -88,6 +88,7 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); #define TIF_SIGPENDING 2 /* signal pending */ #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_SINGLESTEP 4 /* restore ss @ return to usr mode */ +#define TIF_FD_SLOTS 5 /* syscall prepared descriptors */ #define TIF_RESTORE_SIGMASK 6 /* restore sig mask in do_signal() */ #define TIF_NOTIFY_SIGNAL 7 /* signal notifications exist */ /* true if poll_idle() is polling TIF_NEED_RESCHED */ @@ -98,6 +99,7 @@ register struct thread_info *__current_thread_info asm(QUOTED_THREADINFO_REG); #define _TIF_SIGPENDING (1 << TIF_SIGPENDING) #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED) #define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP) +#define _TIF_FD_SLOTS (1 << TIF_FD_SLOTS) #define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL) /* work to do on interrupt/exception return - All but TIF_SYSCALL_TRACE */ diff --git a/arch/hexagon/kernel/traps.c b/arch/hexagon/kernel/traps.c index 6fe0c1b62c1b..4d15c5212fd7 100644 --- a/arch/hexagon/kernel/traps.c +++ b/arch/hexagon/kernel/traps.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -381,6 +382,9 @@ void do_trap0(struct pt_regs *regs) regs->r04, regs->r05); } + if (unlikely(test_thread_flag(TIF_FD_SLOTS))) + fd_slots_commit(regs); + /* allow strace to get the syscall return state */ if (unlikely(test_thread_flag(TIF_SYSCALL_TRACE))) ptrace_report_syscall_exit(regs, 0); -- 2.53.0