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 61E554A260B; Tue, 15 Sep 2026 11:33:16 +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=1789471998; cv=none; b=Rwqf3x42+zjnHw9GhPV9A3zrFOL7nMvXiSTvB4/PbEHvzlyR140OJjKA2QCLeh/I7hoZar9eKpbdvnhZpfYpTrakzh6q7GlElMiEs3U2nqpAejaL9MQjrr2RFlNaFbhIUvDCxdjSPYuImyp1OV20Xn3ompzVWEg+DkWeV2FoSTQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789471998; c=relaxed/simple; bh=D2omDG7mr0KTxlJ4GQ7QAZA4OxsIde5l5dfPMzqmPuo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=A8sOtXPbg7ly6QOMd/A7FCIDfgBclUWgtCCWz1Oe0p0tTU+j1wIZ3EBerFH06X8B4dQf9R4XGUR42ni3wY6cZNSDGj476hf4BtGJgMG8Bb5JMwgDBV1IPl0MyQihHp0WMPRT3AIf7RE0F7zitmcMFg253hcIJF++S1WnzAD3XHQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ahFaO1Ef; 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="ahFaO1Ef" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C925A1F000FF; Tue, 15 Sep 2026 11:33:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789471996; bh=kxC9gcnyDcUdFgs3BFwtpBJTgH6vRdY/SXD7WnErgiA=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=ahFaO1Ef44833cAg/ipYrlljR/L9kqnoccr/DtSi2ZpktkAECstbBuUB4GsshEh2o 37/q8m87cD/I7tX9ntbegeSKXsEeXv4Fw9pAQ1PmC8L6I9T3UsC/XkGoMHM498NGhQ FxRqxgdQFODLQ/81upkVsZx/cPJJi/WMcnG+dRajxR0jt8M9VdkFbun0aNVMyEwUQ5 XtHO0iVATJ50fn1gpeGdm9Z7iWnBGgBM5hv58to7WQYb3XmbmM+8rmfsCFxIh4aLfu N9c2Ol8XHEuDPz5itF2eetj1K0aBSEdfHdO3T/ovrf08suZa/vYreTr9DEievxGy1D i2Yzc/LALmn9Q== From: Christian Brauner Date: Tue, 15 Sep 2026 13:31:01 +0200 Subject: [PATCH RFC POC 15/50] sh: 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-v1-15-4d5217d6b246@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=3805; i=brauner@kernel.org; h=from:subject:message-id; bh=D2omDG7mr0KTxlJ4GQ7QAZA4OxsIde5l5dfPMzqmPuo=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWSt1KnNWsrlUHjqoaue3sF7yYL+Gfs/u112TbkevtDom Y/vkpZJHaUsDGJcDLJiiiwO7Sbhcst5KjYbZWrAzGFlAhnCwMUpABPZeo2R4c+KV9OZba12svrO 2S4zjzHAJMO9lPWUn8uRKZu3i0VMOM3I8DSgLigic8O6rYs7ON2+9ysf4gu88um/5/1vyUeDwxn 92QA= X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Add TIF_FD_SLOTS to the syscall work mask. syscall_exit rereads the flags after the system call and goes to syscall_exit_work for any bit in the all-work mask, but hands over a copy shifted right by eight when the bit was in the upper byte. Reload the flags there and test the full mask, so that the bit reaches do_syscall_trace_leave(). Signed-off-by: Christian Brauner (Amutable) --- arch/sh/include/asm/thread_info.h | 10 +++++++--- arch/sh/kernel/entry-common.S | 8 ++++++-- arch/sh/kernel/ptrace_32.c | 4 ++++ 3 files changed, 17 insertions(+), 5 deletions(-) diff --git a/arch/sh/include/asm/thread_info.h b/arch/sh/include/asm/thread_info.h index 471db5173036..d976cf21f346 100644 --- a/arch/sh/include/asm/thread_info.h +++ b/arch/sh/include/asm/thread_info.h @@ -106,6 +106,7 @@ extern void init_thread_xstate(void); #define TIF_SECCOMP 6 /* secure computing */ #define TIF_NOTIFY_RESUME 7 /* callback before returning to user */ #define TIF_SYSCALL_TRACEPOINT 8 /* for ftrace syscall instrumentation */ +#define TIF_FD_SLOTS 9 /* syscall prepared descriptors */ #define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */ #define TIF_MEMDIE 18 /* is terminating due to OOM killer */ @@ -118,22 +119,25 @@ extern void init_thread_xstate(void); #define _TIF_SECCOMP (1 << TIF_SECCOMP) #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME) #define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT) +#define _TIF_FD_SLOTS (1 << TIF_FD_SLOTS) #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) /* work to do in syscall trace */ #define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \ _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | \ - _TIF_SYSCALL_TRACEPOINT) + _TIF_SYSCALL_TRACEPOINT | _TIF_FD_SLOTS) /* work to do on any return to u-space */ #define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE | _TIF_SIGPENDING | \ _TIF_NEED_RESCHED | _TIF_SYSCALL_AUDIT | \ _TIF_SINGLESTEP | _TIF_NOTIFY_RESUME | \ - _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL) + _TIF_SYSCALL_TRACEPOINT | _TIF_NOTIFY_SIGNAL | \ + _TIF_FD_SLOTS) /* work to do on interrupt/exception return */ #define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \ - _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)) + _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP | \ + _TIF_FD_SLOTS)) /* * Thread-synchronous status. diff --git a/arch/sh/kernel/entry-common.S b/arch/sh/kernel/entry-common.S index 91ab2607a1ff..593a482e85f5 100644 --- a/arch/sh/kernel/entry-common.S +++ b/arch/sh/kernel/entry-common.S @@ -164,9 +164,13 @@ work_resched: .align 2 syscall_exit_work: - ! r0: current_thread_info->flags ! r8: current_thread_info - tst #(_TIF_WORK_SYSCALL_MASK & 0xff), r0 + mov.l @(TI_FLAGS,r8), r0 ! current_thread_info->flags + mov #(_TIF_WORK_SYSCALL_MASK & 0xff), r1 + mov #(_TIF_WORK_SYSCALL_MASK >> 8), r2 + shll8 r2 + or r2, r1 + tst r1, r0 bt/s work_pending tst #_TIF_NEED_RESCHED, r0 TRACE_IRQS_ON diff --git a/arch/sh/kernel/ptrace_32.c b/arch/sh/kernel/ptrace_32.c index 8794081483fb..3deadd71f464 100644 --- a/arch/sh/kernel/ptrace_32.c +++ b/arch/sh/kernel/ptrace_32.c @@ -8,6 +8,7 @@ * Audit support by Yuichi Nakamura */ #include +#include #include #include #include @@ -476,6 +477,9 @@ asmlinkage void do_syscall_trace_leave(struct pt_regs *regs) { int step; + if (test_thread_flag(TIF_FD_SLOTS)) + fd_slots_commit(regs); + audit_syscall_exit(regs); if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT))) -- 2.53.0