[openwrt/openwrt] kernel: provide better control & help for SLUB configuration

[LEDE Commits]

rmilecki pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/4fb8e68bc40d7f6f898477c5570b317f50b7b069

commit 4fb8e68bc40d7f6f898477c5570b317f50b7b069
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Tue Nov 7 23:25:52 2023 +0100

    kernel: provide better control & help for SLUB configuration
    
    Allow selecting KERNEL_SLUB_DEBUG and KERNEL_SLUB_DEBUG_ON manually and
    provide detailed help for both.
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 config/Config-kernel.in | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index a1209d82f3..4c43190e40 100644
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -682,10 +682,23 @@ config KERNEL_PRINTK_TIME
 	default y
 
 config KERNEL_SLUB_DEBUG
-	bool
+	bool "Enable SLUB debugging support"
+	help
+	  This enables various debugging features:
+	    - Accepts "slub_debug" kernel parameter
+	    - Provides caches debugging options (e.g. tracing, validating)
+	    - Adds /sys/kernel/slab/ attrs for reading amounts of *objects*
+	    - Enables /proc/slabinfo support
+	    - Prints info when running out of memory
+
+	  Enabling this can result in a significant increase of code size.
 
 config KERNEL_SLUB_DEBUG_ON
-	bool
+	depends on KERNEL_SLUB_DEBUG
+	bool "Boot kernel with basic caches debugging enabled"
+	help
+	  This enables by default sanity_checks, red_zone, poison and store_user
+	  debugging options for all caches.
 
 config KERNEL_SLABINFO
 	select KERNEL_SLUB_DEBUG