diff options
| author | Linus Torvalds <[email protected]> | 2023-05-19 16:07:39 -0700 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2023-05-23 21:05:04 -0400 |
| commit | aaecdaf922835ed9a8ce56cdd9a8d40fe630257a (patch) | |
| tree | 8417b442e4650fda4f49ad0b0efaa6156490021a /drivers/fpga/fpga-mgr.c | |
| parent | 3e0fea09b17fa2255f6cb0108bbffd4a505f8925 (diff) | |
tracing/user_events: Remove RCU lock while pinning pages
pin_user_pages_remote() can reschedule which means we cannot hold any
RCU lock while using it. Now that enablers are not exposed out to the
tracing register callbacks during fork(), there is clearly no need to
require the RCU lock as event_mutex is enough to protect changes.
Remove unneeded RCU usages when pinning pages and walking enablers with
event_mutex held. Cleanup a misleading "safe" list walk that is not
needed. During fork() duplication, remove unneeded RCU list add, since
the list is not exposed yet.
Link: https://lkml.kernel.org/r/[email protected]
Link: https://lore.kernel.org/linux-trace-kernel/CAHk-=wiiBfT4zNS29jA0XEsy8EmbqTH1hAPdRJCDAJMD8Gxt5A@mail.gmail.com/
Fixes: 7235759084a4 ("tracing/user_events: Use remote writes for event enablement")
Signed-off-by: Linus Torvalds <[email protected]>
[ change log written by Beau Belgrave ]
Signed-off-by: Beau Belgrave <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Diffstat (limited to 'drivers/fpga/fpga-mgr.c')
0 files changed, 0 insertions, 0 deletions