ACPI: turn off all debug output by default

When CONFIG_ACPI_DEBUG=y, the default acpi_dbg_layer and acpi_dbg_level
values built into the ACPI CA have some debug output enabled.  We'd
rather be quiet unless the user actually specified the acpi.debug_level
argument.

This enables distros to ship with CONFIG_ACPI_DEBUG=y without
inundating users with debug output.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index 765fd1c56cd66bc445ab5228f562177b9eb469e1..7edf6d913c1318fded1fd4cf6a448b2f799a0849 100644 (file)
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -688,6 +688,14 @@ void __init acpi_early_init(void)
        if (acpi_disabled)
                return;
 
+       /*
+        * ACPI CA initializes acpi_dbg_level to non-zero, which means
+        * we get debug output merely by turning on CONFIG_ACPI_DEBUG.
+        * Turn it off so we don't get output unless the user specifies
+        * acpi.debug_level.
+        */
+       acpi_dbg_level = 0;
+
        printk(KERN_INFO PREFIX "Core revision %08x\n", ACPI_CA_VERSION);
 
        /* enable workarounds, unless strict ACPI spec. compliance */