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tracing: Tag trace_percpu_buffer as a percpu pointer

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commit f28439db470cca8b6b082239314e9fd10bd39034 upstream.

Tag trace_percpu_buffer as a percpu pointer to resolve warnings
reported by sparse:
  /linux/kernel/trace/trace.c:3218:46: warning: incorrect type in initializer (different address spaces)
  /linux/kernel/trace/trace.c:3218:46:    expected void const [noderef] __percpu *__vpp_verify
  /linux/kernel/trace/trace.c:3218:46:    got struct trace_buffer_struct *
  /linux/kernel/trace/trace.c:3234:9: warning: incorrect type in initializer (different address spaces)
  /linux/kernel/trace/trace.c:3234:9:    expected void const [noderef] __percpu *__vpp_verify
  /linux/kernel/trace/trace.c:3234:9:    got int *

Link: https://lkml.kernel.org/r/ebabd3f23101d89cb75671b68b6f819f5edc830b.1640255304.git.naveen.n.rao@linux.vnet.ibm.com

Cc: stable@vger.kernel.org
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 07d777fe8c398 ("tracing: Add percpu buffers for trace_printk()")
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Naveen N. Rao 2021-12-23 16:04:39 +05:30 committed by Greg Kroah-Hartman
parent b71cf66095
commit 0edf5cdefd
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace.c
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@ -2354,7 +2354,7 @@ struct trace_buffer_struct {
char buffer[4][TRACE_BUF_SIZE];
};
static struct trace_buffer_struct *trace_percpu_buffer;
static struct trace_buffer_struct __percpu *trace_percpu_buffer;
/*
* Thise allows for lockless recording. If we're nested too deeply, then
@ -2383,7 +2383,7 @@ static void put_trace_buf(void)
static int alloc_percpu_trace_buffer(void)
{
struct trace_buffer_struct *buffers;
struct trace_buffer_struct __percpu *buffers;
buffers = alloc_percpu(struct trace_buffer_struct);
if (WARN(!buffers, "Could not allocate percpu trace_printk buffer"))