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sJv55J1Hb5k+IxSebjtfU1ZPqL97Vn2uzWuKBgvuXl2R/dqwIRs6mPlrRt3GuGPzNHxM+tKYoOCv6LbnGJOxH0R9z6r9jActOB5ATymGbb3fVW6Cn5pJbBQ8Rhw1Mr8qy+d0yGa3eqw1jo9Bn16WKim8O8e8h6/RHsrsPxuTtAAmJxY/6nmJpJIZkfPoCA5F4TtSO0AbmPDfySiT5IgufpPdMl6hv7C4WtdubskCbRxREsi/WRnWF6FuV5UwLhqac1M0voeTSiVpkoTF2JGtS5ysvv0rr3XUEUQawARtaBaogzogXAWfCn/ydf1CGZJrdLGugxR+6cnhnTC4NbKaOFW73690CqoqDitR9/7zzIFJENANInmxidvfVHo8lS919SdQ4sKwgVd9rQ+bAqIEUdTeSoNcQnX07GrbpNI9xVm5H8FECv9MDjzXKElhAGC1NLNkG9DrBOK44WyQ= 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: List-Subscribe: List-Unsubscribe: On 10/30/24 5:39 AM, Catalin Marinas wrote: > On Wed, Oct 30, 2024 at 11:53:06AM +0000, Lorenzo Stoakes wrote: >> On Wed, Oct 30, 2024 at 12:09:43PM +0100, Vlastimil Babka wrote: >>> On 10/30/24 11:58, Catalin Marinas wrote: >>>> On Wed, Oct 30, 2024 at 10:18:27AM +0100, Vlastimil Babka wrote: >>>>> On 10/29/24 19:11, Lorenzo Stoakes wrote: >>>>>> --- a/arch/arm64/include/asm/mman.h >>>>>> +++ b/arch/arm64/include/asm/mman.h >>>>>> @@ -6,6 +6,8 @@ >>>>>> >>>>>> #ifndef BUILD_VDSO >>>>>> #include >>>>>> +#include >>>>>> +#include >>>>>> #include >>>>>> >>>>>> static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, >>>>>> @@ -31,19 +33,21 @@ static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, >>>>>> } >>>>>> #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) >>>>>> >>>>>> -static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags) >>>>>> +static inline unsigned long arch_calc_vm_flag_bits(struct file *file, >>>>>> + unsigned long flags) >>>>>> { >>>>>> /* >>>>>> * Only allow MTE on anonymous mappings as these are guaranteed to be >>>>>> * backed by tags-capable memory. The vm_flags may be overridden by a >>>>>> * filesystem supporting MTE (RAM-based). >>>>> We should also eventually remove the last sentence or even replace it with >>>>> its negation, or somebody might try reintroducing the pattern that won't >>>>> work anymore (wasn't there such a hugetlbfs thing in -next?). >>>> I agree, we should update this comment as well though as a fix this >>>> patch is fine for now. >>>> >>>> There is indeed a hugetlbfs change in -next adding VM_MTE_ALLOWED. It >>>> should still work after the above change but we'd need to move it over >>> I guess it will work after the above change, but not after 5/5? >>> >>>> here (and fix the comment at the same time). We'll probably do it around >>>> -rc1 or maybe earlier once this fix hits mainline. >>> I assume this will hopefully go to rc7. >> To be clear - this is a CRITICAL fix that MUST land for 6.12. I'd be inclined to >> try to get it to an earlier rc-. > Ah, good point. So after this series is merged at rc6/rc7, the new > MTE+hugetlbfs in -next won't work. Not an issue, it can be sorted out > later. > >>>> I don't think we have >>>> an equivalent of shmem_file() for hugetlbfs, we'll need to figure >>>> something out. >>> I've found is_file_hugepages(), could work? And while adding the hugetlbfs >>> change here, the comment could be adjusted too, right? >> Right but the MAP_HUGETLB should work to? Can we save such changes that >> alter any kind of existing behaviour to later series? >> >> As this is going to be backported (by me...!) and I don't want to risk >> inadvertant changes. > MAP_HUGETLB and is_file_hugepages() fixes can go in after 6.13-rc1. This > series is fine as is, we wouldn't backport any MAP_HUGETLB changes > anyway since the flag check wasn't the only issue that needed addressing > for hugetlb MTE mappings. I agree. The fix looks trivial. >