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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/
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1751f872cc
Add the const qualifier to all the ctl_tables in the tree except for
watchdog_hardlockup_sysctl, memory_allocation_profiling_sysctls,
loadpin_sysctl_table and the ones calling register_net_sysctl (./net,
drivers/inifiniband dirs). These are special cases as they use a
registration function with a non-const qualified ctl_table argument or
modify the arrays before passing them on to the registration function.
Constifying ctl_table structs will prevent the modification of
proc_handler function pointers as the arrays would reside in .rodata.
This is made possible after commit 78eb4ea25cd5 ("sysctl: treewide:
constify the ctl_table argument of proc_handlers") constified all the
proc_handlers.
Created this by running an spatch followed by a sed command:
Spatch:
virtual patch
@
depends on !(file in "net")
disable optional_qualifier
@
identifier table_name != {
watchdog_hardlockup_sysctl,
iwcm_ctl_table,
ucma_ctl_table,
memory_allocation_profiling_sysctls,
loadpin_sysctl_table
};
@@
+ const
struct ctl_table table_name [] = { ... };
sed:
sed --in-place \
-e "s/struct ctl_table .table = &uts_kern/const struct ctl_table *table = \&uts_kern/" \
kernel/utsname_sysctl.c
Reviewed-by: Song Liu <song@kernel.org>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org> # for kernel/trace/
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> # SCSI
Reviewed-by: Darrick J. Wong <djwong@kernel.org> # xfs
Acked-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Acked-by: Baoquan He <bhe@redhat.com>
Acked-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Acked-by: Anna Schumaker <anna.schumaker@oracle.com>
Signed-off-by: Joel Granados <joel.granados@kernel.org>
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
// SPDX-License-Identifier: MIT
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/*
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* Copyright © 2023-2024 Intel Corporation
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*/
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#include <linux/errno.h>
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#include <linux/sysctl.h>
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#include <uapi/drm/xe_drm.h>
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#include "xe_oa.h"
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#include "xe_observation.h"
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u32 xe_observation_paranoid = true;
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static struct ctl_table_header *sysctl_header;
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static int xe_oa_ioctl(struct drm_device *dev, struct drm_xe_observation_param *arg,
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struct drm_file *file)
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{
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switch (arg->observation_op) {
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case DRM_XE_OBSERVATION_OP_STREAM_OPEN:
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return xe_oa_stream_open_ioctl(dev, arg->param, file);
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case DRM_XE_OBSERVATION_OP_ADD_CONFIG:
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return xe_oa_add_config_ioctl(dev, arg->param, file);
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case DRM_XE_OBSERVATION_OP_REMOVE_CONFIG:
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return xe_oa_remove_config_ioctl(dev, arg->param, file);
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default:
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return -EINVAL;
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}
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}
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/**
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* xe_observation_ioctl - The top level observation layer ioctl
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* @dev: @drm_device
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* @data: pointer to struct @drm_xe_observation_param
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* @file: @drm_file
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*
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* The function is called for different observation streams types and
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* allows execution of different operations supported by those stream
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* types.
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*
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* Return: 0 on success or a negative error code on failure.
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*/
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int xe_observation_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
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{
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struct drm_xe_observation_param *arg = data;
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if (arg->extensions)
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return -EINVAL;
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switch (arg->observation_type) {
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case DRM_XE_OBSERVATION_TYPE_OA:
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return xe_oa_ioctl(dev, arg, file);
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default:
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return -EINVAL;
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}
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}
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static const struct ctl_table observation_ctl_table[] = {
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{
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.procname = "observation_paranoid",
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.data = &xe_observation_paranoid,
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.maxlen = sizeof(xe_observation_paranoid),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = SYSCTL_ZERO,
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.extra2 = SYSCTL_ONE,
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},
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};
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/**
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* xe_observation_sysctl_register - Register xe_observation_paranoid sysctl
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*
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* Normally only superuser/root can access observation stream
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* data. However, superuser can set xe_observation_paranoid sysctl to 0 to
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* allow non-privileged users to also access observation data.
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*
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* Return: always returns 0
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*/
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int xe_observation_sysctl_register(void)
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{
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sysctl_header = register_sysctl("dev/xe", observation_ctl_table);
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return 0;
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}
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/**
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* xe_observation_sysctl_unregister - Unregister xe_observation_paranoid sysctl
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*/
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void xe_observation_sysctl_unregister(void)
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{
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unregister_sysctl_table(sysctl_header);
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}
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