fs/coredump: reduce redundant log noise in validate_coredump_safety

Currently, writing to 'core_pattern' or 'suid_dumpable' sysctl nodes
always triggers validate_coredump_safety(), even if the values have
not changed. This results in redundant warning messages in dmesg:

"Unsafe core_pattern used with fs.suid_dumpable=2..."

This patch optimizes the procfs handlers to only invoke the safety
validation when an actual change in the configuration is detected:

1. In proc_dostring_coredump(), compare the new core_pattern string
   with the existing one using strncmp().
2. In proc_dointvec_minmax_coredump(), check if the new suid_dumpable
   value differs from the previous one.

This keeps the kernel log clean from repetitive warnings when
re-applying the same sysctl settings.

Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://patch.msgid.link/20260410080918.2319-1-lirongqing@baidu.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

0 files changed, 0 insertions, 0 deletions