CHECK: Prefer using the BIT macro
#60: FILE: kernel/bpf/trampoline.c:39:
+#define TRAMPOLINE_LOCKS_TABLE_SIZE (1 << TRAMPOLINE_LOCKS_BITS)

CHECK: struct mutex definition without comment
#63: FILE: kernel/bpf/trampoline.c:42:
+	struct mutex mutex;

WARNING: line length of 92 exceeds 80 columns
#69: FILE: kernel/bpf/trampoline.c:48:
+	return &trampoline_locks[hash_64((u64)(uintptr_t) tr, TRAMPOLINE_LOCKS_BITS)].mutex;

CHECK: No space is necessary after a cast
#69: FILE: kernel/bpf/trampoline.c:48:
+	return &trampoline_locks[hash_64((u64)(uintptr_t) tr, TRAMPOLINE_LOCKS_BITS)].mutex;

WARNING: line length of 93 exceeds 80 columns
#102: FILE: kernel/bpf/trampoline.c:122:
+	 *    select_trampoline_lock(tr) => direct_mutex (ftrace.c) => ftrace_lock (ftrace.c)

WARNING: line length of 88 exceeds 80 columns
#112: FILE: kernel/bpf/trampoline.c:130:
+	 * mutex_trylock(select_trampoline_lock(tr)) to avoid deadlock in race condition

WARNING: line length of 86 exceeds 80 columns
#119: FILE: kernel/bpf/trampoline.c:134:
+		/* sleep 1 ms to make sure whatever holding select_trampoline_lock(tr)

WARNING: line length of 102 exceeds 80 columns
#242: FILE: kernel/bpf/trampoline.c:1410:
+		__mutex_init(&trampoline_locks[i].mutex, "trampoline_lock", &trampoline_locks[i].key);

total: 0 errors, 5 warnings, 3 checks, 190 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
      mechanically convert to the typical style using --fix or --fix-inplace.

Commit 40877133537e ("bpf: Use mutex lock pool for bpf trampolines") has style problems, please review.

NOTE: Ignored message types: ALLOC_SIZEOF_STRUCT BAD_REPORTED_BY_LINK CAMELCASE COMMIT_LOG_LONG_LINE FILE_PATH_CHANGES GIT_COMMIT_ID MACRO_ARG_REUSE NO_AUTHOR_SIGN_OFF

NOTE: If any of the errors are false positives, please report
      them to the maintainer, see CHECKPATCH in MAINTAINERS.
total: 0 errors, 5 warnings, 3 checks, 190 lines checked