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x86/itmt: Don't make ITMT enablement depend on debugfs

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sched_set_itmt_support() treats debugfs file creation failures as fatal.
When CONFIG_DEBUG_FS is disabled, debugfs stubs return ERR_PTR(-ENODEV),
causing ITMT to be silently disabled.

debugfs is a debug-only facility; its return values should be ignored.
Drop the fatal error handling and enable ITMT unconditionally.

Fixes: d04013a4b2 ("x86/itmt: Move the "sched_itmt_enabled" sysctl to debugfs")
Reported-by: Klaus Kusche <klaus.kusche@computerix.info>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://patch.msgid.link/20260831053836.1881864-1-mario.limonciello@amd.com
This commit is contained in:
Mario Limonciello 2026-08-31 00:38:33 -05:00 committed by Peter Zijlstra
parent b038383526
commit eaece48499
1 changed files with 2 additions and 6 deletions
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8
arch/x86/kernel/itmt.c
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@ -110,18 +110,14 @@ int sched_set_itmt_support(void)
arch_debugfs_dir,
&sysctl_sched_itmt_enabled,
&dfs_sched_itmt_fops);
if (IS_ERR_OR_NULL(dfs_sched_itmt)) {
if (IS_ERR(dfs_sched_itmt))
dfs_sched_itmt = NULL;
return -ENOMEM;
}
dfs_sched_core_prio = debugfs_create_file("sched_core_priority", 0644,
arch_debugfs_dir, NULL,
&sched_core_priority_fops);
if (IS_ERR_OR_NULL(dfs_sched_core_prio)) {
if (IS_ERR(dfs_sched_core_prio))
dfs_sched_core_prio = NULL;
return -ENOMEM;
}
sched_itmt_capable = true;