forked from Minki/linux
perf build: Stop using __weak bpf_map_create() to handle older libbpf versions
By adding a feature test for bpf_map_create() and providing a fallback if it isn't present in older versions of libbpf. This also fixes the build with torvalds/master at this point: $ git log --oneline -5 torvalds/masterbabf0bb978(torvalds/master) Merge tag 'xfs-5.19-for-linus' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linuxe375780b63Merge tag 'fsnotify_for_v5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs8b728edc5bMerge tag 'fs_for_v5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs3f306ea2e1Merge tag 'dma-mapping-5.19-2022-05-25' of git://git.infradead.org/users/hch/dma-mappingfbe86daca0Merge tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi $ Coping with: $ git log --oneline -2d16495a982d16495a982libbpf: remove bpf_create_map*() APIse2371b1632libbpf: start 1.0 development cycle $ As the __weak function fails to build as it calls the now removed bpf_create_map() API. Testing: $ rpm -q libbpf-devel libbpf-devel-0.4.0-2.fc35.x86_64 $ $ make -C tools/perf BUILD_BPF_SKEL=1 LIBBPF_DYNAMIC=1 O=/tmp/build/perf install-bin $ cat /tmp/build/perf/feature/test-libbpf-bpf_map_create.make.output test-libbpf-bpf_map_create.c: In function ‘main’: test-libbpf-bpf_map_create.c:6:16: error: implicit declaration of function ‘bpf_map_create’; did you mean ‘bpf_map_freeze’? [-Werror=implicit-function-declaration] 6 | return bpf_map_create(0 /* map_type */, NULL /* map_name */, 0, /* key_size */, | ^~~~~~~~~~~~~~ | bpf_map_freeze test-libbpf-bpf_map_create.c:6:87: error: expected expression before ‘,’ token 6 | return bpf_map_create(0 /* map_type */, NULL /* map_name */, 0, /* key_size */, | ^ cc1: all warnings being treated as errors $ $ objdump -dS /tmp/build/perf/perf | grep '<bpf_map_create>:' -A20 000000000058b290 <bpf_map_create>: { 58b290: 55 push %rbp 58b291: 48 89 e5 mov %rsp,%rbp 58b294: 48 83 ec 10 sub $0x10,%rsp 58b298: 64 48 8b 04 25 28 00 mov %fs:0x28,%rax 58b29f: 00 00 58b2a1: 48 89 45 f8 mov %rax,-0x8(%rbp) 58b2a5: 31 c0 xor %eax,%eax return bpf_create_map(map_type, key_size, value_size, max_entries, 0); 58b2a7: 48 8b 45 f8 mov -0x8(%rbp),%rax 58b2ab: 64 48 2b 04 25 28 00 sub %fs:0x28,%rax 58b2b2: 00 00 58b2b4: 75 10 jne 58b2c6 <bpf_map_create+0x36> } 58b2b6: c9 leave 58b2b7: 89 d6 mov %edx,%esi 58b2b9: 89 ca mov %ecx,%edx 58b2bb: 44 89 c1 mov %r8d,%ecx return bpf_create_map(map_type, key_size, value_size, max_entries, 0); 58b2be: 45 31 c0 xor %r8d,%r8d $ Cc: Andrii Nakryiko <andrii@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Ian Rogers <irogers@google.com> Cc: Ilya Leoshkevich <iii@linux.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Song Liu <songliubraving@fb.com> Cc: Sumanth Korikkar <sumanthk@linux.ibm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Link: http://lore.kernel.org/linux-perf-users/Yo+XvQNKL4K5khl2@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo
parent
982be47751
commit
df76e00383
@ -102,6 +102,7 @@ FEATURE_TESTS_EXTRA := \
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libbpf-bpf_prog_load \
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libbpf-bpf_object__next_program \
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libbpf-bpf_object__next_map \
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libbpf-bpf_create_map \
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libpfm4 \
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libdebuginfod \
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clang-bpf-co-re
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@ -59,6 +59,7 @@ FILES= \
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test-libbpf.bin \
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test-libbpf-btf__load_from_kernel_by_id.bin \
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test-libbpf-bpf_prog_load.bin \
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test-libbpf-bpf_map_create.bin \
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test-libbpf-bpf_object__next_program.bin \
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test-libbpf-bpf_object__next_map.bin \
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test-libbpf-btf__raw_data.bin \
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@ -298,6 +299,9 @@ $(OUTPUT)test-libbpf-btf__load_from_kernel_by_id.bin:
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$(OUTPUT)test-libbpf-bpf_prog_load.bin:
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$(BUILD) -lbpf
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$(OUTPUT)test-libbpf-bpf_map_create.bin:
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$(BUILD) -lbpf
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$(OUTPUT)test-libbpf-bpf_object__next_program.bin:
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$(BUILD) -lbpf
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8
tools/build/feature/test-libbpf-bpf_map_create.c
Normal file
8
tools/build/feature/test-libbpf-bpf_map_create.c
Normal file
@ -0,0 +1,8 @@
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// SPDX-License-Identifier: GPL-2.0
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#include <bpf/bpf.h>
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int main(void)
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{
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return bpf_map_create(0 /* map_type */, NULL /* map_name */, 0, /* key_size */,
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0 /* value_size */, 0 /* max_entries */, NULL /* opts */);
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}
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@ -589,6 +589,10 @@ ifndef NO_LIBELF
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ifeq ($(feature-libbpf-btf__raw_data), 1)
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CFLAGS += -DHAVE_LIBBPF_BTF__RAW_DATA
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endif
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$(call feature_check,libbpf-bpf_map_create)
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ifeq ($(feature-libbpf-bpf_map_create), 1)
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CFLAGS += -DHAVE_LIBBPF_BPF_MAP_CREATE
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endif
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else
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dummy := $(error Error: No libbpf devel library found, please install libbpf-devel);
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endif
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@ -598,6 +602,7 @@ ifndef NO_LIBELF
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CFLAGS += -DHAVE_LIBBPF_BPF_OBJECT__NEXT_PROGRAM
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CFLAGS += -DHAVE_LIBBPF_BPF_OBJECT__NEXT_MAP
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CFLAGS += -DHAVE_LIBBPF_BTF__RAW_DATA
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CFLAGS += -DHAVE_LIBBPF_BPF_MAP_CREATE
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endif
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endif
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@ -312,7 +312,10 @@ static bool bperf_attr_map_compatible(int attr_map_fd)
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(map_info.value_size == sizeof(struct perf_event_attr_map_entry));
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}
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int __weak
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#ifndef HAVE_LIBBPF_BPF_MAP_CREATE
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LIBBPF_API int bpf_create_map(enum bpf_map_type map_type, int key_size,
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int value_size, int max_entries, __u32 map_flags);
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int
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bpf_map_create(enum bpf_map_type map_type,
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const char *map_name __maybe_unused,
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__u32 key_size,
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@ -325,6 +328,7 @@ bpf_map_create(enum bpf_map_type map_type,
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return bpf_create_map(map_type, key_size, value_size, max_entries, 0);
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#pragma GCC diagnostic pop
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}
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#endif
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static int bperf_lock_attr_map(struct target *target)
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{
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