Messages in this thread Patch in this message | | | From | Petr Mladek <> | Subject | [PATCH] powerpc/bpf: Enable bpf_probe_read{, str}() on powerpc again | Date | Wed, 27 May 2020 14:28:44 +0200 |
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The commit 0ebeea8ca8a4d1d453a ("bpf: Restrict bpf_probe_read{, str}() only to archs where they work") caused that bpf_probe_read{, str}() functions were not longer available on architectures where the same logical address might have different content in kernel and user memory mapping. These architectures should use probe_read_{user,kernel}_str helpers.
For backward compatibility, the problematic functions are still available on architectures where the user and kernel address spaces are not overlapping. This is defined CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE.
At the moment, these backward compatible functions are enabled only on x86_64, arm, and arm64. Let's do it also on powerpc that has the non overlapping address space as well.
Signed-off-by: Petr Mladek <pmladek@suse.com> To: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Christoph Hellwig <hch@lst.de> --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index d13b5328ca10..b29d7cb38368 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -126,6 +126,7 @@ config PPC select ARCH_HAS_MMIOWB if PPC64 select ARCH_HAS_PHYS_TO_DMA select ARCH_HAS_PMEM_API + select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_DEVMAP if PPC_BOOK3S_64 select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_MEMBARRIER_CALLBACKS -- 2.26.2
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