config: add KERNEL_DYNAMIC_DEBUG option

Useful when debugging kernel which uses this infrastructure, for
example ubi/ubifs.

Signed-off-by: Luka Perkov <luka@openwrt.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39007 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index d5b565e..3347254 100644 (file)
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -68,6 +68,18 @@ config KERNEL_DEBUG_LL
        help
          ARM low level debugging
 
+config KERNEL_DYNAMIC_DEBUG 
+       bool "Compile the kernel with dynamic printk"
+       select KERNEL_DEBUG_FS
+       default n
+       help
+         Compiles debug level messages into the kernel, which would not
+         otherwise be available at runtime. These messages can then be
+         enabled/disabled based on various levels of scope - per source file,
+         function, module, format string, and line number. This mechanism
+         implicitly compiles in all pr_debug() and dev_dbg() calls, which
+         enlarges the kernel text size by about 2%.
+
 config KERNEL_EARLY_PRINTK
        bool "Compile the kernel with early printk"
        default n