initial buildroot for linux 5.15

package/emlog/Config.in

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+config BR2_PACKAGE_EMLOG
+	bool "emlog"
+	depends on BR2_LINUX_KERNEL
+	help
+	  emlog is a Linux kernel module that makes it easy to access
+	  the most recent (and only the most recent) output from a
+	  process. It works just like "tail -f" on a log file, except
+	  that the storage required never grows. This can be useful in
+	  embedded systems where there isn't enough memory or disk
+	  space for keeping complete log files, but the most recent
+	  debugging messages are sometimes needed (e.g., after an
+	  error is observed).
+
+	  https://github.com/nicupavel/emlog
+
+comment "emlog needs a Linux kernel to be built"
+	depends on !BR2_LINUX_KERNEL

package/emlog/emlog.hash

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+# Locally calculated
+sha256 76082cf981b0865c8a1b300d4641c790a6556461901bbb63700df38300277271  emlog-0.70.tar.gz
+sha256 32b1062f7da84967e7019d01ab805935caa7ab7321a7ced0e30ebe75e5df1670  COPYING

package/emlog/emlog.mk

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+################################################################################
+#
+# emlog
+#
+################################################################################
+
+EMLOG_VERSION = 0.70
+EMLOG_SITE = $(call github,nicupavel,emlog,emlog-$(EMLOG_VERSION))
+EMLOG_LICENSE = GPL-2.0
+EMLOG_LICENSE_FILES = COPYING
+
+# CVE-2019-16868 and CVE-2019-17073 are misclassified (by our CVE tracker) as
+# affecting emlog, while in fact it affects http://www.emlog.net.
+EMLOG_IGNORE_CVES += CVE-2019-16868 CVE-2019-17073
+
+define EMLOG_BUILD_CMDS
+	$(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS) nbcat
+endef
+
+# make install tries to strip, so install manually.
+define EMLOG_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0755 $(@D)/nbcat $(TARGET_DIR)/usr/bin/nbcat
+endef
+
+$(eval $(kernel-module))
+$(eval $(generic-package))