kbuild: trace functions in subdirectories of lib/

ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)

exists here in sub-directories of lib/ to keep the behavior of
commit 2464a609 ("ftrace: do not trace library functions").

Since that commit, not only the objects in lib/ but also the ones in
the sub-directories are excluded from ftrace (although the commit
description did not explicitly mention this).

However, most of library functions in sub-directories are not so hot.
Re-add them to ftrace.

Going forward, only the objects right under lib/ will be excluded.

Cc: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

lib/842/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_842_COMPRESS) += 842_compress.o
 obj-$(CONFIG_842_DECOMPRESS) += 842_decompress.o

lib/crypto/Makefile

 # SPDX-License-Identifier: GPL-2.0
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 # chacha is used by the /dev/random driver which is always builtin
 obj-y						+= chacha.o
 obj-$(CONFIG_CRYPTO_LIB_CHACHA_GENERIC)		+= libchacha.o

lib/dim/Makefile

@@ -2,8 +2,6 @@
 # DIM Dynamic Interrupt Moderation library
 #
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_DIMLIB) += dim.o
 
 dim-y := dim.o net_dim.o rdma_dim.o

lib/fonts/Makefile

 # SPDX-License-Identifier: GPL-2.0
 # Font handling
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 font-objs := fonts.o
 
 font-objs-$(CONFIG_FONT_SUN8x16)   += font_sun8x16.o

lib/kunit/Makefile

-
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_KUNIT) +=			kunit.o
 
 kunit-objs +=				test.o \

lib/livepatch/Makefile

@@ -2,8 +2,6 @@
 #
 # Makefile for livepatch test code.
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_TEST_LIVEPATCH) += test_klp_atomic_replace.o \
 				test_klp_callbacks_demo.o \
 				test_klp_callbacks_demo2.o \
@@ -14,7 +12,3 @@ obj-$(CONFIG_TEST_LIVEPATCH) += test_klp_atomic_replace.o \
 				test_klp_state.o \
 				test_klp_state2.o \
 				test_klp_state3.o
-
-# Target modules to be livepatched require CC_FLAGS_FTRACE
-CFLAGS_test_klp_callbacks_busy.o	+= $(CC_FLAGS_FTRACE)
-CFLAGS_test_klp_callbacks_mod.o		+= $(CC_FLAGS_FTRACE)

lib/lz4/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
 ccflags-y += -O3
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
 
 obj-$(CONFIG_LZ4_COMPRESS) += lz4_compress.o
 obj-$(CONFIG_LZ4HC_COMPRESS) += lz4hc_compress.o

lib/lzo/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 lzo_compress-objs := lzo1x_compress.o
 lzo_decompress-objs := lzo1x_decompress_safe.o
 

lib/math/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-y += div64.o gcd.o lcm.o int_pow.o int_sqrt.o reciprocal_div.o
 
 obj-$(CONFIG_CORDIC)		+= cordic.o

lib/mpi/Makefile

@@ -3,8 +3,6 @@
 # MPI multiprecision maths library (from gpg)
 #
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_MPILIB) = mpi.o
 
 mpi-y = \

lib/raid6/Makefile

 # SPDX-License-Identifier: GPL-2.0
-
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_RAID6_PQ)	+= raid6_pq.o
 
 raid6_pq-y	+= algos.o recov.o tables.o int1.o int2.o int4.o \

lib/reed_solomon/Makefile

@@ -3,7 +3,5 @@
 # This is a modified version of reed solomon lib,
 #
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_REED_SOLOMON) += reed_solomon.o
 obj-$(CONFIG_REED_SOLOMON_TEST) += test_rslib.o

lib/xz/Makefile

 # SPDX-License-Identifier: GPL-2.0-only
-
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_XZ_DEC) += xz_dec.o
 xz_dec-y := xz_dec_syms.o xz_dec_stream.o xz_dec_lzma2.o
 xz_dec-$(CONFIG_XZ_DEC_BCJ) += xz_dec_bcj.o

lib/zlib_deflate/Makefile

@@ -7,8 +7,6 @@
 # decompression code.
 #
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate.o
 
 zlib_deflate-objs := deflate.o deftree.o deflate_syms.o

lib/zlib_dfltcc/Makefile

@@ -6,8 +6,6 @@
 # This is the code for s390 zlib hardware support.
 #
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_ZLIB_DFLTCC) += zlib_dfltcc.o
 
 zlib_dfltcc-objs := dfltcc.o dfltcc_deflate.o dfltcc_inflate.o dfltcc_syms.o

lib/zlib_inflate/Makefile

@@ -14,8 +14,6 @@
 # uncompression can be done without blocking on allocation).
 #
 
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
-
 obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate.o
 
 zlib_inflate-objs := inffast.o inflate.o infutil.o \

lib/zstd/Makefile

@@ -3,7 +3,6 @@ obj-$(CONFIG_ZSTD_COMPRESS) += zstd_compress.o
 obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd_decompress.o
 
 ccflags-y += -O3
-ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
 
 zstd_compress-y := fse_compress.o huf_compress.o compress.o \
 		   entropy_common.o fse_decompress.o zstd_common.o