initial buildroot for linux 5.15

package/jemalloc/Config.in

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+config BR2_PACKAGE_JEMALLOC_ARCH_SUPPORTS
+	bool
+	# see include/jemalloc/internal/quantum.h
+	default y if BR2_arm || BR2_armeb
+	default y if BR2_aarch64 || BR2_aarch64_be
+	default y if BR2_i386 || BR2_x86_64
+	default y if BR2_m68k
+	default y if BR2_mips || BR2_mipsel || BR2_mips64 || BR2_mips64el
+	default y if BR2_nios2
+	default y if BR2_or1k
+	default y if BR2_powerpc
+	default y if BR2_riscv
+	default y if BR2_sh4 || BR2sh4eb || BR2_sh4a || BR2_sh4aeb
+	default y if BR2_sparc64
+
+config BR2_PACKAGE_JEMALLOC
+	bool "jemalloc"
+	depends on BR2_PACKAGE_JEMALLOC_ARCH_SUPPORTS
+	depends on BR2_TOOLCHAIN_HAS_THREADS
+	help
+	  This library providing a malloc(3) implementation that
+	  emphasizes fragmentation avoidance and scalable concurrency
+	  support.
+
+	  http://jemalloc.net/
+
+comment "jemalloc needs a toolchain w/ threads"
+	depends on BR2_PACKAGE_JEMALLOC_ARCH_SUPPORTS
+	depends on !BR2_TOOLCHAIN_HAS_THREADS

package/jemalloc/jemalloc.hash

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+# Locally calculated
+sha256 34330e5ce276099e2e8950d9335db5a875689a4c6a56751ef3b1d8c537f887f6  jemalloc-5.2.1.tar.bz2
+sha256 94aa2caa98c25d942f58b956c71dba6a99ff98fc3a31cbc669fe2a4cd0268b53  COPYING

package/jemalloc/jemalloc.mk

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+################################################################################
+#
+# jemalloc
+#
+################################################################################
+
+JEMALLOC_VERSION = 5.2.1
+JEMALLOC_SOURCE = jemalloc-$(JEMALLOC_VERSION).tar.bz2
+JEMALLOC_SITE = https://github.com/jemalloc/jemalloc/releases/download/$(JEMALLOC_VERSION)
+JEMALLOC_LICENSE = BSD-2-Clause
+JEMALLOC_LICENSE_FILES = COPYING
+JEMALLOC_INSTALL_STAGING = YES
+JEMALLOC_CONFIG_SCRIPTS = jemalloc-config
+
+# gcc bug internal compiler error: in merge_overlapping_regs, at
+# regrename.c:304. This bug is fixed since gcc 6.
+ifeq ($(BR2_or1k):$(BR2_TOOLCHAIN_GCC_AT_LEAST_6),y:)
+JEMALLOC_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -O0"
+endif
+
+$(eval $(autotools-package))
+$(eval $(host-autotools-package))