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[172.10.233.147]) by smtp.gmail.com with ESMTPSA id k34-20020a25b2a2000000b00bcdb7d2a03bsm1631948ybj.17.2023.06.14.22.43.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 Jun 2023 22:43:42 -0700 (PDT) Date: Wed, 14 Jun 2023 22:43:30 -0700 (PDT) From: Hugh Dickins X-X-Sender: hugh@ripple.attlocal.net To: Nathan Chancellor cc: Hugh Dickins , Andrew Morton , Mike Kravetz , Mike Rapoport , "Kirill A. Shutemov" , Matthew Wilcox , David Hildenbrand , Suren Baghdasaryan , Qi Zheng , Peter Zijlstra , Russell King , Catalin Marinas , Will Deacon , Geert Uytterhoeven , Greg Ungerer , Michal Simek , Thomas Bogendoerfer , Helge Deller , John David Anglin , "Aneesh Kumar K.V" , Michael Ellerman , Alexandre Ghiti , Palmer Dabbelt , Heiko Carstens , Christian Borntraeger , Claudio Imbrenda , Alexander Gordeev , John Paul Adrian Glaubitz , "David S. Miller" , Chris Zankel , Max Filippov , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v2 07/23] mips: update_mmu_cache() can replace __update_tlb() In-Reply-To: Message-ID: <344a4da-3890-45fd-607e-b5f85ca6ad48@google.com> References: <178970b0-1539-8aac-76fd-972c6c46ec17@google.com> <20230614231758.GA1503611@dev-arch.thelio-3990X> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="-1463760895-383800441-1686807822=:3640" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1463760895-383800441-1686807822=:3640 Content-Type: text/plain; charset=US-ASCII On Wed, 14 Jun 2023, Hugh Dickins wrote: > On Wed, 14 Jun 2023, Nathan Chancellor wrote: > > > > I just bisected a crash while powering down a MIPS machine in QEMU to > > this change as commit 8044511d3893 ("mips: update_mmu_cache() can > > replace __update_tlb()") in linux-next. > > Thank you, Nathan, that's very helpful indeed. This patch certainly knew > that it wanted testing, and I'm glad to hear that it is now seeing some. > > While powering down? The messages below look like it was just coming up, > but no doubt that's because you were bisecting (or because I'm unfamiliar > with what messages to expect there). It's probably irrelevant information, > but I wonder whether the (V)machine worked well enough for a while before > you first powered down and spotted the problem, or whether it's never got > much further than trying to run init (busybox)? I'm trying to get a feel > for whether the problem occurs under common or uncommon conditions. > > > Unfortunately, I can still > > reproduce it with the existing fix you have for this change on the > > mailing list, which is present in next-20230614. > > Right, that later fix was only for a build warning, nothing functional > (or at least I hoped that it wasn't making any functional difference). > > Thanks a lot for the detailed instructions below: unfortunately, those > would draw me into a realm of testing I've never needed to enter before, > so a lot of time spent on setup and learning. Usually, I just stare at > the source. > > What this probably says is that I should revert most my cleanup there, > and keep as close to the existing code as possible. But some change is > needed, and I may need to understand (or have a good guess at) what was > going wrong, to decide what kind of retreat will be successful. > > Back to the source for a while: I hope I'll find examples in nearby MIPS > kernel source (and git history), which will hint at the right way forward. > Then send you a patch against next-20230614 to try, when I'm reasonably > confident that it's enough to satisfy my purpose, but likely not to waste > your time. I'm going to take advantage of your good nature by attaching two alternative patches, either to go on top of next-20230614. mips1.patch, arch/mips/mm/tlb-r4k.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-) is by far my favourite. I couldn't see anything wrong with what's already there for mips, but it seems possible that (though I didn't find it) somewhere calls update_mmu_cache_pmd() on a page table. So mips1.patch restores the pmd_huge() check, and cleans up further by removing the silly pgdp, p4dp, pudp, pmdp stuff: the pointer has now been passed in by the caller, why walk the tree again? I should have done it this way before. But if that doesn't work, then I'm afraid it will have to be mips2.patch, arch/mips/include/asm/pgtable.h | 15 ++++++++++++--- arch/mips/mm/tlb-r3k.c | 5 ++--- arch/mips/mm/tlb-r4k.c | 27 ++++++++++++++++++--------- 3 files changed, 32 insertions(+), 15 deletions(-) which reverts all of the original patch and its build warning fix, and does a pte_unmap() to balance the silly pte_offset_map() there; with an apologetic comment for this being about the only place in the tree where I have no idea what to do if ptep were NULL. I do hope that you find the first fixes the breakage; but if not, then I even more fervently hope that the second will, despite my hating it. Touch wood for the first, fingers crossed for the second, thanks, Hugh ---1463760895-383800441-1686807822=:3640 Content-Type: text/x-patch; name=mips1.patch Content-Transfer-Encoding: BASE64 Content-ID: Content-Description: Content-Disposition: attachment; filename=mips1.patch LS0tIGEvYXJjaC9taXBzL21tL3RsYi1yNGsuYw0KKysrIGIvYXJjaC9taXBz L21tL3RsYi1yNGsuYw0KQEAgLTI5MywxMiArMjkzLDYgQEAgdm9pZCBsb2Nh bF9mbHVzaF90bGJfb25lKHVuc2lnbmVkIGxvbmcgcGFnZSkNCiB2b2lkIHVw ZGF0ZV9tbXVfY2FjaGUoc3RydWN0IHZtX2FyZWFfc3RydWN0ICp2bWEsDQog CQkgICAgICB1bnNpZ25lZCBsb25nIGFkZHJlc3MsIHB0ZV90ICpwdGVwKQ0K IHsNCi0jaWZkZWYgQ09ORklHX01JUFNfSFVHRV9UTEJfU1VQUE9SVA0KLQlw Z2RfdCAqcGdkcDsNCi0JcDRkX3QgKnA0ZHA7DQotCXB1ZF90ICpwdWRwOw0K LQlwbWRfdCAqcG1kcDsNCi0jZW5kaWYNCiAJdW5zaWduZWQgbG9uZyBmbGFn czsNCiAJaW50IGlkeCwgcGlkOw0KIA0KQEAgLTMyMywxMiArMzE3LDggQEAg dm9pZCB1cGRhdGVfbW11X2NhY2hlKHN0cnVjdCB2bV9hcmVhX3N0cnVjdCAq dm1hLA0KIAl0bGJfcHJvYmVfaGF6YXJkKCk7DQogCWlkeCA9IHJlYWRfYzBf 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