From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Date: Tue, 12 Nov 2019 06:29:51 +0000 Subject: Re: [PATCH V9] mm/debug: Add tests validating architecture page table helpers Message-Id: <20191112062951.GA100264@gmail.com> List-Id: References: <1573532326-24084-1-git-send-email-anshuman.khandual@arm.com> In-Reply-To: <1573532326-24084-1-git-send-email-anshuman.khandual@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Anshuman Khandual Cc: Mark Rutland , linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org, Peter Zijlstra , James Hogan , Tetsuo Handa , Heiko Carstens , Michal Hocko , linux-mm@kvack.org, Dave Hansen , Paul Mackerras , sparclinux@vger.kernel.org, Thomas Gleixner , linux-s390@vger.kernel.org, Michael Ellerman , x86@kernel.org, Russell King - ARM Linux , Matthew Wilcox , Steven Price , Jason Gunthorpe , Gerald Schaefer , linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Kees Cook , Masahiro Yamada , Mark Brown , "Kirill A . Shutemov" , Dan Williams , Vlastimil Babka , Christophe Leroy , Sri Krishna chowdary , Ard Biesheuvel , Greg Kroah-Hartman , linux-mips@vger.kernel.org, Ralf Baechle , linux-kernel@vger.kernel.org, Paul Burton , Mike Rapoport , Vineet Gupta , Martin Schwidefsky , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" * Anshuman Khandual wrote: > +config DEBUG_VM_PGTABLE > + bool "Debug arch page table for semantics compliance" > + depends on MMU > + depends on DEBUG_VM > + depends on ARCH_HAS_DEBUG_VM_PGTABLE > + help > + This option provides a debug method which can be used to test > + architecture page table helper functions on various platforms in > + verifying if they comply with expected generic MM semantics. This > + will help architecture code in making sure that any changes or > + new additions of these helpers still conform to expected > + semantics of the generic MM. > + > + If unsure, say N. Since CONFIG_DEBUG_VM is generally disabled in distro kernel packages, why not make this 'default y' to maximize testing coverage? The code size increase should be minimal, and DEBUG_VM increases size anyway. Other than that this looks good to me: Reviewed-by: Ingo Molnar Thanks, Ingo