bpf: Remove migrate_disable in kprobe_multi_link_prog_run

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[ Upstream commit abdaf49be5 ]

Graph tracer framework ensures we won't migrate, kprobe_multi_link_prog_run
called all the way from graph tracer, which disables preemption in
function_graph_enter_regs, as Jiri and Yonghong suggested, there is no
need to use migrate_disable. As a result, some overhead may will be reduced.
And add cant_sleep check for __this_cpu_inc_return.

Fixes: 0dcac27254 ("bpf: Add multi kprobe link")
Signed-off-by: Tao Chen <chen.dylane@linux.dev>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20250814121430.2347454-1-chen.dylane@linux.dev
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Tao Chen 2025-08-14 20:14:29 +08:00 • committed by Greg Kroah-Hartman

parent a5af34777e

commit f059795ec6

1 changed files with 7 additions and 2 deletions

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kernel/trace/bpf_trace.c

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