[openwrt/openwrt] kernel: only strip proc for small flash devices

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/4943bc5cff47a482c3010033e04c6d489a4b733c

commit 4943bc5cff47a482c3010033e04c6d489a4b733c
Author: Nick Hainke <vincent at systemli.org>
AuthorDate: Wed Dec 9 21:17:47 2020 +0100

    kernel: only strip proc for small flash devices
    
    Currently, you are not able to get statistics about IPv4 and IPv6
    usage. This information can be collected via the snmp and snmp6.
    However, in the current state this interface is disabled as you can
    read in the "902-debloat_proc.patch":
     "Strip non-essential /proc functionality to reduce code size"
    
    Tools like netstat use the snmp/6 interface to collect interface
    statistics. Some prometheus exporters also mention this:
    - prometheus-collectors/netstat.lua
    - prometheus-collectors/snmp6 (still a PR)
    - collectd/snmp6 (still a PR)
    
    PRs:
    - https://github.com/collectd/collectd/pull/3789
    - https://github.com/openwrt/packages/pull/14158
    
    Instead of enabling it as default for all devices we condition it
     default y if SMALL_FLASH
    
    A test shows it needs around 16 kiB.
    
    Signed-off-by: Nick Hainke <vincent at systemli.org>
    [fixed whitespace issue]
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 config/Config-kernel.in         | 6 +++++-
 target/linux/generic/config-5.4 | 1 -
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index c9efed84d3..e22fcf6382 100644
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -35,6 +35,10 @@ config KERNEL_SWAP
 	bool "Support for paging of anonymous memory (swap)"
 	default y if !SMALL_FLASH
 
+config KERNEL_PROC_STRIPPED
+	bool "Strip non-essential /proc functionality to reduce code size"
+	default y if SMALL_FLASH
+
 config KERNEL_DEBUG_FS
 	bool "Compile the kernel with debug filesystem enabled"
 	default y
@@ -376,7 +380,7 @@ config KERNEL_AIO
 config KERNEL_IO_URING
 	bool "Compile the kernel with io_uring support"
 	default y if !SMALL_FLASH
-	depends on LINUX_5_4 
+	depends on LINUX_5_4
 
 config KERNEL_FHANDLE
 	bool "Compile the kernel with support for fhandle syscalls"
diff --git a/target/linux/generic/config-5.4 b/target/linux/generic/config-5.4
index 00fbd93ff4..8473817000 100644
--- a/target/linux/generic/config-5.4
+++ b/target/linux/generic/config-5.4
@@ -4123,7 +4123,6 @@ CONFIG_PRINT_STACK_DEPTH=64
 CONFIG_PROC_FS=y
 # CONFIG_PROC_KCORE is not set
 # CONFIG_PROC_PAGE_MONITOR is not set
-CONFIG_PROC_STRIPPED=y
 CONFIG_PROC_SYSCTL=y
 # CONFIG_PROC_VMCORE_DEVICE_DUMP is not set
 # CONFIG_PROFILE_ALL_BRANCHES is not set