linux-kernel - [PATCH v2] LoongArch/bpf: Enable bpf_probe

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Date:   Thu, 27 Jul 2023 12:21:25 +0800
From:   Chenguang Zhao <zhaochenguang@...inos.cn>
To:     chenhuacai@...nel.org
Cc:     kernel@...0n.name, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        zhaochenguang@...inos.cn
Subject: [PATCH v2] LoongArch/bpf: Enable bpf_probe_read{, str}() on LoongArch

Currently nettrace does not work on LoongArch due to missing
bpf_probe_read{,str}() support, with the error message:

     ERROR: failed to load kprobe-based eBPF
     ERROR: failed to load kprobe-based bpf

According to commit 0ebeea8ca8a4d ("bpf: Restrict bpf_probe_read{,
str}() only to archs where they work"), we only need to select
CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE to add said support,
because LoongArch does have non-overlapping address ranges for kernel
and userspace.

Signed-off-by: Chenguang Zhao <zhaochenguang@...inos.cn>
---
 arch/loongarch/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig
index 903096bd87f8..4a156875e9cc 100644
--- a/arch/loongarch/Kconfig
+++ b/arch/loongarch/Kconfig
@@ -11,6 +11,7 @@ config LOONGARCH
 	select ARCH_ENABLE_MEMORY_HOTREMOVE
 	select ARCH_HAS_ACPI_TABLE_UPGRADE	if ACPI
 	select ARCH_HAS_PTE_SPECIAL
+	select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
 	select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
 	select ARCH_INLINE_READ_LOCK if !PREEMPTION
 	select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION
-- 
2.25.1