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charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-fs-v1-15-d09a996317b3@kernel.org> References: <20261102-work-procfs-fs-v1-0-d09a996317b3@kernel.org> In-Reply-To: <20261102-work-procfs-fs-v1-0-d09a996317b3@kernel.org> To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=950; i=brauner@kernel.org; h=from:subject:message-id; bh=qIZMo2xD6WijzH8eCxcoPQWkqyhBdrmfr/XH6W+8iSI=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS9WG7ExefxM/s4z6HMuLP3ZGefX+6xsmVr7IUfm4u2V Ki6Fvx831HKwiDGxSArpsji0G4SLrecp2KzUaYGzBxWJpAhDFycAjARt2CG/0EfvR80+J/5o3qz ZXre4ifTW10KtD3PvVi8oa/zDvf2QnNGhsUVyZFdtvc9vu1c+ij2Ws/3EP9Zmx8qpokHcu3cW7w 2ghUA X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 /proc/profile is created when profiling is turned on and never removed. Say so with PROC_ENTRY_PERMANENT, procfs then calls into it without pinning it. It keeps reading straight into userspace through ->proc_read() since readprofile reads the whole file in one go and a copy of all of it through a procfs buffer doesn't buy anything for an entry that can't go away. Signed-off-by: Christian Brauner (Amutable) --- kernel/profile.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/profile.c b/kernel/profile.c index 6e4b34f35e3b..6f2441dd4a00 100644 --- a/kernel/profile.c +++ b/kernel/profile.c @@ -206,6 +206,7 @@ static ssize_t write_profile(struct file *file, char *buf, size_t count, } static const struct proc_ops profile_proc_ops = { + .proc_flags = PROC_ENTRY_PERMANENT, .proc_read = read_profile, .proc_write_buf = write_profile, .proc_lseek = default_llseek, -- 2.53.0