From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: linux-mips@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org, Xuefeng Li <lixuefeng@loongson.cn>
Subject: [PATCH] MIPS/bpf: Enable bpf_probe_read{, str}() on MIPS again
Date: Wed, 17 Mar 2021 15:15:07 +0800 [thread overview]
Message-ID: <1615965307-6926-1-git-send-email-yangtiezhu@loongson.cn> (raw)
After commit 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to
archs where they work"), bpf_probe_read{, str}() functions were not longer
available on MIPS, so there exists some errors when running bpf program:
root@linux:/home/loongson/bcc# python examples/tracing/task_switch.py
bpf: Failed to load program: Invalid argument
[...]
11: (85) call bpf_probe_read#4
unknown func bpf_probe_read#4
[...]
Exception: Failed to load BPF program count_sched: Invalid argument
So select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE in arch/mips/Kconfig,
otherwise the bpf old helper bpf_probe_read() will not be available.
This is similar with the commit d195b1d1d1196 ("powerpc/bpf: Enable
bpf_probe_read{, str}() on powerpc again").
Fixes: 0ebeea8ca8a4 ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
arch/mips/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 160b3a8..4b94ec7 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -6,6 +6,7 @@ config MIPS
select ARCH_BINFMT_ELF_STATE if MIPS_FP_SUPPORT
select ARCH_HAS_FORTIFY_SOURCE
select ARCH_HAS_KCOV
+ select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
select ARCH_HAS_PTE_SPECIAL if !(32BIT && CPU_HAS_RIXI)
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAS_UBSAN_SANITIZE_ALL
--
2.1.0
next reply other threads:[~2021-03-17 7:16 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-17 7:15 Tiezhu Yang [this message]
2021-03-17 9:59 ` [PATCH] MIPS/bpf: Enable bpf_probe_read{, str}() on MIPS again Sergei Shtylyov
2021-03-17 22:18 ` Daniel Borkmann
2021-03-17 23:08 ` Thomas Bogendoerfer
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