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Subject: Re: [PATCH v4 5/6] x86/sgx: Hook sgx_memory_failure() into mainline
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To:     Jarkko Sakkinen <jarkko@kernel.org>,
        "Luck, Tony" <tony.luck@intel.com>,
        Sean Christopherson <seanjc@google.com>
Cc:     "Zhang, Cathy" <cathy.zhang@intel.com>,
        "x86@kernel.org" <x86@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
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Message-ID: <30034c82-99fa-3592-c215-cb9c61f87456@intel.com>
Date:   Tue, 7 Sep 2021 07:13:46 -0700
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Precedence: bulk

On 9/7/21 7:07 AM, Jarkko Sakkinen wrote:
>> If I just #include <asm/sgx.h> in those files I'll break the build for other
>> architectures.
> What does specifically break the build?

Remember, our x86 "<asm/sgx.h>" is:

	arch/x86/include/asm/sgx.h

On powerpc, "<asm/sgx.h>" is:

	arch/powerpc/include/asm/sgx.h

You'll get a file not found error looking for sgx.h.

That said... Tony, it's probably a bit more friendly if the mm.h code
you add:

> +#ifdef CONFIG_X86_SGX
> +int sgx_memory_failure(unsigned long pfn, int flags);
> +bool sgx_is_epc_page(u64 paddr);
> +#else
> +static inline int sgx_memory_failure(unsigned long pfn, int flags)
> +{
> +	return -ENXIO;
> +}
> +
> +static inline bool sgx_is_epc_page(u64 paddr)
> +{
> +	return false;
> +}
> +#endif

was a bit more generic.  Maybe something like:

	int arch_memory_failure(unsigned long pfn, int flags);

BTW, I don't see sgx_is_epc_page() in arch-generic code.  Does it really
need to be in mm.h?