Mercurial > libjeffpc
changeset 861:111936b70fcc
synch: minor mutex lock checking optimization
This saves 23 bytes of instructions on amd64 which is not worth it, but we
will need the out label for recursive lock policies anyway.
Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
| author | Josef 'Jeff' Sipek <jeffpc@josefsipek.net> |
|---|---|
| date | Sat, 14 Jan 2023 13:44:43 -0500 |
| parents | 3c2e349df2d1 |
| children | 6075f43a5d72 |
| files | synch.c |
| diffstat | 1 files changed, 5 insertions(+), 0 deletions(-) [+] |
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--- a/synch.c Fri Jan 13 11:03:28 2023 -0500 +++ b/synch.c Sat Jan 14 13:44:43 2023 -0500 @@ -503,6 +503,10 @@ if (!atomic_read(&lockdep_on)) return; + held = last_acquired_lock(); + if (!held) + goto out; /* nothing held, nothing to check */ + /* check for deadlocks & recursive locking */ for_each_held_lock(i, held) { if ((held->info != info) && (held->info->lc != info->lc)) @@ -516,6 +520,7 @@ if (check_circular_deps(info, where)) return; +out: held = held_stack_alloc(); if (!held) { error_alloc(info, where, "lock nesting limit reached");