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adobriyan@gmail.com, johannes@sipsolutions.net, pedro.falcato@gmail.com, hca@linux.ibm.com, willy@infradead.org, anna-maria@linutronix.de, mark.rutland@arm.com, linus.walleij@linaro.org, Jason@zx2c4.com, deller@gmx.de, rdunlap@infradead.org, davem@davemloft.net, peterx@redhat.com, f.fainelli@gmail.com, gerg@kernel.org, dave.hansen@linux.intel.com, mingo@kernel.org, ardb@kernel.org, mhocko@suse.com, 42.hyeyoo@gmail.com, peterz@infradead.org, ardb@google.com, enh@google.com, rientjes@google.com, groeck@chromium.org, mpe@ellerman.id.au, aleksandr.mikhalitsyn@canonical.com, mike.rapoport@gmail.com Subject: Re: [PATCH v7 6/7] mseal, system mappings: uprobe mapping Message-ID: References: <20250224225246.3712295-1-jeffxu@google.com> <20250224225246.3712295-7-jeffxu@google.com> <20250226162604.GA17833@redhat.com> <20250226180135.GI8995@redhat.com> <20250226182050.GK8995@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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rspam01 X-HE-Tag: 1740594368-270984 X-HE-Meta: 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 iFvd2HTM 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.019128, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Feb 26, 2025 at 07:20:50PM +0100, Oleg Nesterov wrote: > On 02/26, Lorenzo Stoakes wrote: > > > > Like I said, Jeff opposes the change. I disagree with him, and agree with you, > > because this is very silly. > > > > But I don't want to hold up this series with that discussion (this is for his > > sake...) > > Neither me, so lets go with VM_SEALED_SYSMAP. > > My only objection is that > > vm_flags = VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO; > vm_flags |= VM_SEALED_SYSMAP; > > looks unnecessarily confusing to me, > > vm_flags = VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO|VM_SEALED_SYSMAP; > > or just > > vma = _install_special_mapping(..., > VM_EXEC|VM_MAYEXEC|VM_DONTCOPY|VM_IO|VM_SEALED_SYSMAP, > ... > > looks more readable. But this is cosmetic/subjective, so I won't argue/insist. Agreed. This would be good. > > > Jeff - perhaps drop this and let's return to it in a follow up so this series > > isn't held up? > > Up to you and Jeff. > > But this patch looks "natural" to me in this series. OK, I mean in that case I'm ok with it as-is, as you confirms there's no issue, I've looked at the code and there's no issue. It was only if we wanted to try the VM_SEALED thing, i.e. _always_ seal then it'd do better outside of the series as there'd be a discussion about maybe changing this CONFIG_64BIT thing yada yada. > > Oleg. > Jeff - in that case, do NOT drop this one :P but do please look at the above style nit. Let's keep things moving... :)