initial buildroot for linux 5.15

package/libpfm4/Config.in

@@ -0,0 +1,11 @@
+config BR2_PACKAGE_LIBPFM4
+	bool "libpfm4"
+	depends on BR2_TOOLCHAIN_HAS_THREADS_NPTL
+	help
+	  A helper library to help encode Performance Events to use with
+	  Operating system kernels performance monitoring interfaces.
+
+	  http://perfmon2.sourceforge.net/
+
+comment "libpfm4 needs a toolchain w/ NPTL"
+	depends on !BR2_TOOLCHAIN_HAS_THREADS_NPTL

package/libpfm4/libpfm4.hash

@@ -0,0 +1,6 @@
+# From http://sourceforge.net/projects/perfmon2/files/libpfm4/:
+sha1  112bced9a67d565ff0ce6c2bb90452516d1183e5  libpfm-4.11.0.tar.gz
+md5  4811c1d99b95752b4ba53b89a9389ec3  libpfm-4.11.0.tar.gz
+# Locally calculated
+sha256  5da5f8872bde14b3634c9688d980f68bda28b510268723cc12973eedbab9fecc  libpfm-4.11.0.tar.gz
+sha256  beef323d68fc5db9c67b20e8e9de7ccde371d20cdbcdd686804055b18b926d90  COPYING

package/libpfm4/libpfm4.mk

@@ -0,0 +1,32 @@
+################################################################################
+#
+# libpfm4
+#
+################################################################################
+
+LIBPFM4_VERSION = 4.11.0
+LIBPFM4_SOURCE = libpfm-$(LIBPFM4_VERSION).tar.gz
+LIBPFM4_SITE = http://downloads.sourceforge.net/project/perfmon2/libpfm4
+LIBPFM4_LICENSE = libpfm4 license
+LIBPFM4_LICENSE_FILES = COPYING
+LIBPFM4_INSTALL_STAGING = YES
+
+LIBPFM4_FLAGS = SYS=Linux ARCH=$(BR2_ARCH) \
+	CC="$(TARGET_CC)" LDCONFIG=true \
+	CONFIG_PFMLIB_SHARED=$(if $(BR2_STATIC_LIBS),n,y) \
+	DBG= \
+	EXAMPLE_DIRS=
+
+define LIBPFM4_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(LIBPFM4_FLAGS)
+endef
+
+define LIBPFM4_INSTALL_STAGING_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(LIBPFM4_FLAGS) PREFIX=$(STAGING_DIR)/usr install
+endef
+
+define LIBPFM4_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) $(LIBPFM4_FLAGS) PREFIX=$(TARGET_DIR)/usr install
+endef
+
+$(eval $(generic-package))