linux-kernel - [PATCH 2/3] riscv: Fixup lockdep_assert_held with wrong param cpu

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Date:   Tue, 16 Jun 2020 15:57:00 +0000
From:   guoren@...nel.org
To:     palmerdabbelt@...gle.com, paul.walmsley@...ive.com,
        anup@...infault.org, zong.li@...ive.com, aou@...s.berkeley.edu,
        tglx@...utronix.de, tycho@...ho.ws, nickhu@...estech.com
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-csky@...r.kernel.org, Guo Ren <guoren@...ux.alibaba.com>
Subject: [PATCH 2/3] riscv: Fixup lockdep_assert_held with wrong param cpu_running

From: Zong Li <zong.li@...ive.com>

The cpu_running is not a lock-class, it lacks the dep_map member in
completion. It causes the error as follow:

arch/riscv/kernel/smpboot.c: In function '__cpu_up':
./include/linux/lockdep.h:364:52: error: 'struct completion' has no member named 'dep_map'
  364 | #define lockdep_is_held(lock)  lock_is_held(&(lock)->dep_map)
      |                                                    ^~
./include/asm-generic/bug.h:113:25: note: in definition of macro 'WARN_ON'
  113 |  int __ret_warn_on = !!(condition);    \
      |                         ^~~~~~~~~
./include/linux/lockdep.h:390:27: note: in expansion of macro 'lockdep_is_held'
  390 |   WARN_ON(debug_locks && !lockdep_is_held(l)); \
      |                           ^~~~~~~~~~~~~~~
arch/riscv/kernel/smpboot.c:118:2: note: in expansion of macro 'lockdep_assert_held'
  118 |  lockdep_assert_held(&cpu_running);

There are a lot of archs which use cpu_running in smpboot.c (arm,
arm64, openrisc, xtensa, s390, x86, mips), but none of them try
lockdep_assert_held(&cpu_running.wait.lock). So Just remove it.

Signed-off-by: Zong Li <zong.li@...ive.com>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
---
 arch/riscv/kernel/smpboot.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 4e99227..defc4e1 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -121,7 +121,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 
 	ret = start_secondary_cpu(cpu, tidle);
 	if (!ret) {
-		lockdep_assert_held(&cpu_running);
 		wait_for_completion_timeout(&cpu_running,
 					    msecs_to_jiffies(1000));
 
-- 
2.7.4