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Howlett" To: Lorenzo Stoakes Cc: Andrew Morton , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , "David S . Miller" , Andreas Larsson , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Alexander Viro , Christian Brauner , Jan Kara , Kees Cook , David Hildenbrand , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Xu Xin , Chengming Zhou , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , David Rientjes , Shakeel Butt , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Masami Hiramatsu , Oleg Nesterov , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Jason Gunthorpe , John Hubbard , Peter Xu , Jann Horn , Pedro Falcato , Matthew Wilcox , Mateusz Guzik , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: Re: [PATCH 08/10] mm: update fork mm->flags initialisation to use bitmap Message-ID: Mail-Followup-To: "Liam R. Howlett" , Lorenzo Stoakes , Andrew Morton , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , "David S . Miller" , Andreas Larsson , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , "H . Peter Anvin" , Alexander Viro , Christian Brauner , Jan Kara , Kees Cook , David Hildenbrand , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Xu Xin , Chengming Zhou , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , David Rientjes , Shakeel Butt , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Kan Liang , Masami Hiramatsu , Oleg Nesterov , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Jason Gunthorpe , John Hubbard , Peter Xu , Jann Horn , Pedro Falcato , Matthew Wilcox , Mateusz Guzik , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, sparclinux@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org References: <9fb8954a7a0f0184f012a8e66f8565bcbab014ba.1755012943.git.lorenzo.stoakes@oracle.com> Content-Type: 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 oObVuUUd XHasMyJwEVCCajlO3kwkT+5ms4n58nssS1SA6co72In6rXZZbuT8M3sP2thapTPot1TosjbREeDnSOhA= 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: * Lorenzo Stoakes [250812 11:47]: > We now need to account for flag initialisation on fork. We retain the > existing logic as much as we can, but dub the existing flag mask legacy. > > These flags are therefore required to fit in the first 32-bits of the flags > field. > > However, further flag propagation upon fork can be implemented in mm_init() > on a per-flag basis. > > We ensure we clear the entire bitmap prior to setting it, and use > __mm_flags_get_word() and __mm_flags_set_word() to manipulate these legacy > fields efficiently. > > Signed-off-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett > --- > include/linux/mm_types.h | 13 ++++++++++--- > kernel/fork.c | 7 +++++-- > 2 files changed, 15 insertions(+), 5 deletions(-) > > diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h > index 38b3fa927997..25577ab39094 100644 > --- a/include/linux/mm_types.h > +++ b/include/linux/mm_types.h > @@ -1820,16 +1820,23 @@ enum { > #define MMF_TOPDOWN 31 /* mm searches top down by default */ > #define MMF_TOPDOWN_MASK _BITUL(MMF_TOPDOWN) > > -#define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\ > +#define MMF_INIT_LEGACY_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\ > MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK |\ > MMF_VM_MERGE_ANY_MASK | MMF_TOPDOWN_MASK) > > -static inline unsigned long mmf_init_flags(unsigned long flags) > +/* Legacy flags must fit within 32 bits. */ > +static_assert((u64)MMF_INIT_LEGACY_MASK <= (u64)UINT_MAX); > + > +/* > + * Initialise legacy flags according to masks, propagating selected flags on > + * fork. Further flag manipulation can be performed by the caller. > + */ > +static inline unsigned long mmf_init_legacy_flags(unsigned long flags) > { > if (flags & (1UL << MMF_HAS_MDWE_NO_INHERIT)) > flags &= ~((1UL << MMF_HAS_MDWE) | > (1UL << MMF_HAS_MDWE_NO_INHERIT)); > - return flags & MMF_INIT_MASK; > + return flags & MMF_INIT_LEGACY_MASK; > } > > #endif /* _LINUX_MM_TYPES_H */ > diff --git a/kernel/fork.c b/kernel/fork.c > index c4ada32598bd..b311caec6419 100644 > --- a/kernel/fork.c > +++ b/kernel/fork.c > @@ -1056,11 +1056,14 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, > mm_init_uprobes_state(mm); > hugetlb_count_init(mm); > > + mm_flags_clear_all(mm); > if (current->mm) { > - mm->flags = mmf_init_flags(current->mm->flags); > + unsigned long flags = __mm_flags_get_word(current->mm); > + > + __mm_flags_set_word(mm, mmf_init_legacy_flags(flags)); > mm->def_flags = current->mm->def_flags & VM_INIT_DEF_MASK; > } else { > - mm->flags = default_dump_filter; > + __mm_flags_set_word(mm, default_dump_filter); > mm->def_flags = 0; > } > > -- > 2.50.1 >