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Sat, 23 Jan 2021 11:01:04 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 1C54F233FC; Sat, 23 Jan 2021 11:00:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611399663; bh=HKE6o3YvB1B4tteaWRG6KFCwQvpwQVukHCQUNVVJeeY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=HKYTq7yJigGOEK8nATV4Dx0NmxniF8qJvpM8DaATKPfSpcwbXynIkCA3n3qe4gShc P58WaSyJhlAC3agVkClm43lT0PT5xZ4J7SJtjlWxMDPo7Z7TJ5vikccGijHyX6Qk3T csEAYzaE2dNiGaDYQSUa2ZRjDbWeimlY9AxOUezkEDzB+tFxoT4KWyZ3/mHJ42y/5p pqq7kjj0H57u727QxLS0KIbNm35ZWU+0trHV9uXECzkWMwPCcm0Vf+ufzHv9e+UsoG s6KF8VZU223mQTNtDCDxNRjB/Glv/5nT7EoghwQyPT8tKfrFHn5E34OlgLb+jD+RQt FTlyibQtHA2wA== Date: Sat, 23 Jan 2021 13:00:41 +0200 From: Mike Rapoport To: Palmer Dabbelt Cc: akpm@linux-foundation.org, viro@zeniv.linux.org.uk, luto@kernel.org, Arnd Bergmann , bp@alien8.de, catalin.marinas@arm.com, cl@linux.com, dan.j.williams@intel.com, dave.hansen@linux.intel.com, david@redhat.com, elena.reshetova@intel.com, hpa@zytor.com, mingo@redhat.com, jejb@linux.ibm.com, kirill@shutemov.name, willy@infradead.org, mark.rutland@arm.com, rppt@linux.ibm.com, mtk.manpages@gmail.com, Paul Walmsley , peterz@infradead.org, rick.p.edgecombe@intel.com, guro@fb.com, shakeelb@google.com, shuah@kernel.org, tglx@linutronix.de, tycho@tycho.ws, will@kernel.org, linux-api@vger.kernel.org, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org, x86@kernel.org, lkp@intel.com Subject: Re: [PATCH v15 03/11] riscv/Kconfig: make direct map manipulation options depend on MMU Message-ID: <20210123110041.GE6332@kernel.org> References: <20210120180612.1058-4-rppt@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Jan 22, 2021 at 08:12:30PM -0800, Palmer Dabbelt wrote: > On Wed, 20 Jan 2021 10:06:04 PST (-0800), rppt@kernel.org wrote: > > From: Mike Rapoport > > > > ARCH_HAS_SET_DIRECT_MAP and ARCH_HAS_SET_MEMORY configuration options have > > no meaning when CONFIG_MMU is disabled and there is no point to enable them > > for the nommu case. > > > > Add an explicit dependency on MMU for these options. > > > > Signed-off-by: Mike Rapoport > > Reported-by: kernel test robot > > --- > > arch/riscv/Kconfig | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig > > index d82303dcc6b6..d35ce19ab1fa 100644 > > --- a/arch/riscv/Kconfig > > +++ b/arch/riscv/Kconfig > > @@ -25,8 +25,8 @@ config RISCV > > select ARCH_HAS_KCOV > > select ARCH_HAS_MMIOWB > > select ARCH_HAS_PTE_SPECIAL > > - select ARCH_HAS_SET_DIRECT_MAP > > - select ARCH_HAS_SET_MEMORY > > + select ARCH_HAS_SET_DIRECT_MAP if MMU > > + select ARCH_HAS_SET_MEMORY if MMU > > select ARCH_HAS_STRICT_KERNEL_RWX if MMU > > select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX > > select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT > > Reviewed-by: Palmer Dabbelt > Acked-by: Palmer Dabbelt > > LMK if you want this to go in via the RISC-V tree, otherwise I'm going to > assume it's going in along with the rest of these. FWIW I see these in other > architectures without the MMU guard. Except arm, they all always have MMU=y and arm selects only ARCH_HAS_SET_MEMORY and has empty stubs for those when MMU=n. Indeed I might have been over zealous adding ARCH_HAS_SET_MEMORY dependency on MMU, as riscv also has these stubs, but I thought that making this explicit is a nice thing. > Thanks! -- Sincerely yours, Mike.