From: kernel test robot <lkp@intel.com>
To: Jeff Layton <jlayton@kernel.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [jlayton:rpc-numa 1/2] net/sunrpc/svc.c:761:37: warning: variable 'rqstp' is uninitialized when used here
Date: Wed, 28 May 2025 16:05:30 +0800 [thread overview]
Message-ID: <202505281507.DsEMM6Az-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux.git rpc-numa
head: 4fb548fc918eae3b330e50c56bae2a0b02b9b157
commit: a0d4dce2778e63a6410a5606d50a17426a4251fd [1/2] sunrpc: new tracepoints around thread wakeups
config: riscv-randconfig-002-20250528 (https://download.01.org/0day-ci/archive/20250528/202505281507.DsEMM6Az-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250528/202505281507.DsEMM6Az-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505281507.DsEMM6Az-lkp@intel.com/
All warnings (new ones prefixed by >>):
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:804:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
804 | insb(addr, buffer, count);
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:104:53: note: expanded from macro 'insb'
104 | #define insb(addr, buffer, count) __insb(PCI_IOBASE + (addr), buffer, count)
| ~~~~~~~~~~ ^
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:812:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
812 | insw(addr, buffer, count);
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:105:53: note: expanded from macro 'insw'
105 | #define insw(addr, buffer, count) __insw(PCI_IOBASE + (addr), buffer, count)
| ~~~~~~~~~~ ^
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:820:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
820 | insl(addr, buffer, count);
| ^~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:106:53: note: expanded from macro 'insl'
106 | #define insl(addr, buffer, count) __insl(PCI_IOBASE + (addr), buffer, count)
| ~~~~~~~~~~ ^
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:829:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
829 | outsb(addr, buffer, count);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:118:55: note: expanded from macro 'outsb'
118 | #define outsb(addr, buffer, count) __outsb(PCI_IOBASE + (addr), buffer, count)
| ~~~~~~~~~~ ^
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:838:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
838 | outsw(addr, buffer, count);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:119:55: note: expanded from macro 'outsw'
119 | #define outsw(addr, buffer, count) __outsw(PCI_IOBASE + (addr), buffer, count)
| ~~~~~~~~~~ ^
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:847:2: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
847 | outsl(addr, buffer, count);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~
arch/riscv/include/asm/io.h:120:55: note: expanded from macro 'outsl'
120 | #define outsl(addr, buffer, count) __outsl(PCI_IOBASE + (addr), buffer, count)
| ~~~~~~~~~~ ^
In file included from net/sunrpc/svc.c:20:
In file included from include/linux/interrupt.h:11:
In file included from include/linux/hardirq.h:11:
In file included from ./arch/riscv/include/generated/asm/hardirq.h:1:
In file included from include/asm-generic/hardirq.h:17:
In file included from include/linux/irq.h:20:
In file included from include/linux/io.h:12:
In file included from arch/riscv/include/asm/io.h:136:
include/asm-generic/io.h:1175:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
1175 | return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
| ~~~~~~~~~~ ^
>> net/sunrpc/svc.c:761:37: warning: variable 'rqstp' is uninitialized when used here [-Wuninitialized]
761 | trace_svc_pool_thread_noidle(pool, rqstp->rq_task->pid);
| ^~~~~
net/sunrpc/svc.c:742:24: note: initialize the variable 'rqstp' to silence this warning
742 | struct svc_rqst *rqstp;
| ^
| = NULL
8 warnings generated.
vim +/rqstp +761 net/sunrpc/svc.c
730
731 /**
732 * svc_pool_wake_idle_thread - Awaken an idle thread in @pool
733 * @pool: service thread pool
734 *
735 * Can be called from soft IRQ or process context. Finding an idle
736 * service thread and marking it BUSY is atomic with respect to
737 * other calls to svc_pool_wake_idle_thread().
738 *
739 */
740 void svc_pool_wake_idle_thread(struct svc_pool *pool)
741 {
742 struct svc_rqst *rqstp;
743 struct llist_node *ln;
744
745 rcu_read_lock();
746 ln = READ_ONCE(pool->sp_idle_threads.first);
747 if (ln) {
748 rqstp = llist_entry(ln, struct svc_rqst, rq_idle);
749 WRITE_ONCE(rqstp->rq_qtime, ktime_get());
750 if (!task_is_running(rqstp->rq_task)) {
751 wake_up_process(rqstp->rq_task);
752 trace_svc_pool_thread_wake(pool, rqstp->rq_task->pid);
753 percpu_counter_inc(&pool->sp_threads_woken);
754 } else {
755 trace_svc_pool_thread_running(pool, rqstp->rq_task->pid);
756 }
757 rcu_read_unlock();
758 return;
759 }
760 rcu_read_unlock();
> 761 trace_svc_pool_thread_noidle(pool, rqstp->rq_task->pid);
762
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2025-05-28 8:06 UTC|newest]
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