Re: [PATCH v2] perf parse-events: Don't report unreadable tracepoint globs as unknown

[sashiko-bot@kernel.org]

> From: Hang Zhengyang <hang.zhengyang1010@gmail.com>
> 
> As a normal user, a tracepoint glob gets the wrong error:
> 
>   $ perf stat -e 'syscalls:*' true
>   event syntax error: 'syscalls:*'
>                        \___ unknown tracepoint
> 
>   Error:  File /sys/kernel/tracing//events/syscalls/* not found.
>   Hint:   Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
> 
> add_tracepoint_multi_sys() returns ENOENT when nothing matched and
> drops the error from reading the directories.  Return that error
> instead, so the glob reports what a plain tracepoint name does:
> 
>   $ perf stat -e 'syscalls:*' true
>   event syntax error: 'syscalls:*'
>                        \___ can't access trace events
> 
>   Error:  No permissions to read /sys/kernel/tracing//events/syscalls/*
>   Hint:   Try 'sudo mount -o remount,mode=755 /sys/kernel/tracing/'
> 
> Fixes: d002aab87de8 ("perf tp_pmu: Factor existing tracepoint logic to new file")
> Assisted-by: Claude:claude-opus-5-5
> Signed-off-by: Hang Zhengyang <hang.zhengyang1010@gmail.com>

Sashiko has reviewed this patch and found no issues.

-- 
Sashiko AI review · https://sashiko.dev/#/patchset/20261111-tp-glob-errno-v2-1-ca45efb07d31@gmail.com?part=1