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bpf: fix perf_snapshot_branch_stack link failure

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The newly added code to handle bpf_get_branch_snapshot fails to link when
CONFIG_PERF_EVENTS is disabled:

aarch64-linux-ld: kernel/bpf/verifier.o: in function `do_misc_fixups':
verifier.c:(.text+0x1090c): undefined reference to `__SCK__perf_snapshot_branch_stack'

Add a build-time check for that Kconfig symbol around the code to
remove the link time dependency.

Fixes: 314a53623c ("bpf: inline bpf_get_branch_snapshot() helper")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20240405142637.577046-1-arnd@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Arnd Bergmann
2024-04-05 16:26:25 +02:00
committed by Alexei Starovoitov
parent 343ca8131c
commit 58babe2718
1 changed files with 2 additions and 1 deletions
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3
kernel/bpf/verifier.c
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@@ -20191,7 +20191,8 @@ patch_map_ops_generic:
}
/* Implement bpf_get_branch_snapshot inline. */
if (prog->jit_requested && BITS_PER_LONG == 64 &&
if (IS_ENABLED(CONFIG_PERF_EVENTS) &&
prog->jit_requested && BITS_PER_LONG == 64 &&
insn->imm == BPF_FUNC_get_branch_snapshot) {
/* We are dealing with the following func protos:
* u64 bpf_get_branch_snapshot(void *buf, u32 size, u64 flags);