linux-kernel - [PATCH] RAS: Fix the trace_show() function to output trace

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Message-Id: <20221005161645.309068-1-tony.luck@intel.com>
Date:   Wed,  5 Oct 2022 09:16:45 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Tony Luck <tony.luck@...el.com>
Subject: [PATCH] RAS: Fix the trace_show() function to output trace_count

The /sys/kernel/debug/ras/daemon_active is used to indicate to some
kernel code whether there is a user mode consumer of RAS trace events
to decide whether to print to the console.

The intent was that reading daemon_active would give the same indication
to users. But the code is broken and does not display anything.

Add a seq_printf() to output the current value of the trace_count.

Fixes: d963cd95bea9 ("RAS, debugfs: Add debugfs interface for RAS subsystem")
Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 drivers/ras/debugfs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ras/debugfs.c b/drivers/ras/debugfs.c
index 0d4f985afbf3..d67af5e08caf 100644
--- a/drivers/ras/debugfs.c
+++ b/drivers/ras/debugfs.c
@@ -15,7 +15,8 @@ EXPORT_SYMBOL_GPL(ras_userspace_consumers);
 
 static int trace_show(struct seq_file *m, void *v)
 {
-	return atomic_read(&trace_count);
+	seq_printf(m, "%d\n", atomic_read(&trace_count));
+	return 0;
 }
 
 static int trace_open(struct inode *inode, struct file *file)
-- 
2.37.3