From: Konstantin Khlebnikov <koct9i@gmail.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: qemu-devel@nongnu.org, kvm@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
linux-api@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Andres Lagar-Cavilla <andreslc@google.com>,
Dave Hansen <dave@sr71.net>, Paolo Bonzini <pbonzini@redhat.com>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>,
Andy Lutomirski <luto@amacapital.net>,
Andrew Morton <akpm@linux-foundation.org>,
Sasha Levin <sasha.levin@oracle.com>,
Hugh Dickins <hughd@google.com>,
Peter Feiner <pfeiner@google.com>,
"\\Dr. David Alan Gilbert\\" <dgilbert@redhat.com>,
Christopher Covington <cov@codeaurora.org>,
Johannes Weiner <hannes@cmpxchg.org>,
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Robert Love <rlove@google.com>,
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Neil Brown <neilb@suse.de>, Mike Hommey <mh@glandium.org>,
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KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
Michel Lespinasse <walken@google.com>,
Minchan Kim <minchan@kernel.org>,
Keith Packard <keithp@keithp.com>,
"Huangpeng (Peter)" <peter.huangpeng@huawei.com>,
Isaku Yamahata <yamahata@valinux.co.jp>,
Anthony Liguori <anthony@codemonkey.ws>,
Stefan Hajnoczi <stefanha@gmail.com>,
Wenchao Xia <wenchaoqemu@gmail.com>,
Andrew Jones <drjones@redhat.com>,
Juan Quintela <quintela@redhat.com>
Subject: Re: [PATCH 07/17] mm: madvise MADV_USERFAULT: prepare vm_flags to allow more than 32bits
Date: Fri, 7 Nov 2014 00:08:13 +0400 [thread overview]
Message-ID: <CALYGNiNWbAadvVzScWsgsdG5bGWir4q8oOWqbDg47C2+kk3=Mw@mail.gmail.com> (raw)
In-Reply-To: <1412356087-16115-8-git-send-email-aarcange@redhat.com>
On Fri, Oct 3, 2014 at 9:07 PM, Andrea Arcangeli <aarcange@redhat.com> wrote:
> We run out of 32bits in vm_flags, noop change for 64bit archs.
What? Again?
As I see there are some free bits: 0x200, 0x1000, 0x80000
I prefer to reserve 0x02000000 for VM_ARCH_2
>
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> ---
> fs/proc/task_mmu.c | 4 ++--
> include/linux/huge_mm.h | 4 ++--
> include/linux/ksm.h | 4 ++--
> include/linux/mm_types.h | 2 +-
> mm/huge_memory.c | 2 +-
> mm/ksm.c | 2 +-
> mm/madvise.c | 2 +-
> mm/mremap.c | 2 +-
> 8 files changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index c341568..ee1c3a2 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -532,11 +532,11 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
> /*
> * Don't forget to update Documentation/ on changes.
> */
> - static const char mnemonics[BITS_PER_LONG][2] = {
> + static const char mnemonics[BITS_PER_LONG+1][2] = {
> /*
> * In case if we meet a flag we don't know about.
> */
> - [0 ... (BITS_PER_LONG-1)] = "??",
> + [0 ... (BITS_PER_LONG)] = "??",
>
> [ilog2(VM_READ)] = "rd",
> [ilog2(VM_WRITE)] = "wr",
> diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
> index 63579cb..3aa10e0 100644
> --- a/include/linux/huge_mm.h
> +++ b/include/linux/huge_mm.h
> @@ -121,7 +121,7 @@ extern void split_huge_page_pmd_mm(struct mm_struct *mm, unsigned long address,
> #error "hugepages can't be allocated by the buddy allocator"
> #endif
> extern int hugepage_madvise(struct vm_area_struct *vma,
> - unsigned long *vm_flags, int advice);
> + vm_flags_t *vm_flags, int advice);
> extern void __vma_adjust_trans_huge(struct vm_area_struct *vma,
> unsigned long start,
> unsigned long end,
> @@ -183,7 +183,7 @@ static inline int split_huge_page(struct page *page)
> #define split_huge_page_pmd_mm(__mm, __address, __pmd) \
> do { } while (0)
> static inline int hugepage_madvise(struct vm_area_struct *vma,
> - unsigned long *vm_flags, int advice)
> + vm_flags_t *vm_flags, int advice)
> {
> BUG();
> return 0;
> diff --git a/include/linux/ksm.h b/include/linux/ksm.h
> index 3be6bb1..8b35253 100644
> --- a/include/linux/ksm.h
> +++ b/include/linux/ksm.h
> @@ -18,7 +18,7 @@ struct mem_cgroup;
>
> #ifdef CONFIG_KSM
> int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
> - unsigned long end, int advice, unsigned long *vm_flags);
> + unsigned long end, int advice, vm_flags_t *vm_flags);
> int __ksm_enter(struct mm_struct *mm);
> void __ksm_exit(struct mm_struct *mm);
>
> @@ -94,7 +94,7 @@ static inline int PageKsm(struct page *page)
>
> #ifdef CONFIG_MMU
> static inline int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
> - unsigned long end, int advice, unsigned long *vm_flags)
> + unsigned long end, int advice, vm_flags_t *vm_flags)
> {
> return 0;
> }
> diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
> index 6e0b286..2c876d1 100644
> --- a/include/linux/mm_types.h
> +++ b/include/linux/mm_types.h
> @@ -217,7 +217,7 @@ struct page_frag {
> #endif
> };
>
> -typedef unsigned long __nocast vm_flags_t;
> +typedef unsigned long long __nocast vm_flags_t;
>
> /*
> * A region containing a mapping of a non-memory backed file under NOMMU
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index d9a21d06..e913a19 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1942,7 +1942,7 @@ out:
> #define VM_NO_THP (VM_SPECIAL | VM_HUGETLB | VM_SHARED | VM_MAYSHARE)
>
> int hugepage_madvise(struct vm_area_struct *vma,
> - unsigned long *vm_flags, int advice)
> + vm_flags_t *vm_flags, int advice)
> {
> switch (advice) {
> case MADV_HUGEPAGE:
> diff --git a/mm/ksm.c b/mm/ksm.c
> index fb75902..faf319e 100644
> --- a/mm/ksm.c
> +++ b/mm/ksm.c
> @@ -1736,7 +1736,7 @@ static int ksm_scan_thread(void *nothing)
> }
>
> int ksm_madvise(struct vm_area_struct *vma, unsigned long start,
> - unsigned long end, int advice, unsigned long *vm_flags)
> + unsigned long end, int advice, vm_flags_t *vm_flags)
> {
> struct mm_struct *mm = vma->vm_mm;
> int err;
> diff --git a/mm/madvise.c b/mm/madvise.c
> index 0938b30..d5aee71 100644
> --- a/mm/madvise.c
> +++ b/mm/madvise.c
> @@ -49,7 +49,7 @@ static long madvise_behavior(struct vm_area_struct *vma,
> struct mm_struct *mm = vma->vm_mm;
> int error = 0;
> pgoff_t pgoff;
> - unsigned long new_flags = vma->vm_flags;
> + vm_flags_t new_flags = vma->vm_flags;
>
> switch (behavior) {
> case MADV_NORMAL:
> diff --git a/mm/mremap.c b/mm/mremap.c
> index 05f1180..fa7db87 100644
> --- a/mm/mremap.c
> +++ b/mm/mremap.c
> @@ -239,7 +239,7 @@ static unsigned long move_vma(struct vm_area_struct *vma,
> {
> struct mm_struct *mm = vma->vm_mm;
> struct vm_area_struct *new_vma;
> - unsigned long vm_flags = vma->vm_flags;
> + vm_flags_t vm_flags = vma->vm_flags;
> unsigned long new_pgoff;
> unsigned long moved_len;
> unsigned long excess = 0;
>
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@kvack.org. For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2014-11-06 20:08 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-03 17:07 [PATCH 00/17] RFC: userfault v2 Andrea Arcangeli
2014-10-03 17:07 ` [PATCH 01/17] mm: gup: add FOLL_TRIED Andrea Arcangeli
2014-10-03 18:15 ` Linus Torvalds
2014-10-03 20:55 ` Paolo Bonzini
2014-10-03 17:07 ` [PATCH 02/17] mm: gup: add get_user_pages_locked and get_user_pages_unlocked Andrea Arcangeli
2014-10-03 17:07 ` [PATCH 03/17] mm: gup: use get_user_pages_unlocked within get_user_pages_fast Andrea Arcangeli
2014-10-03 17:07 ` [PATCH 04/17] mm: gup: make get_user_pages_fast and __get_user_pages_fast latency conscious Andrea Arcangeli
2014-10-03 18:23 ` Linus Torvalds
2014-10-06 14:14 ` Andrea Arcangeli
2014-10-03 17:07 ` [PATCH 05/17] mm: gup: use get_user_pages_fast and get_user_pages_unlocked Andrea Arcangeli
2014-10-03 17:07 ` [PATCH 06/17] kvm: Faults which trigger IO release the mmap_sem Andrea Arcangeli
2014-10-03 17:07 ` [PATCH 07/17] mm: madvise MADV_USERFAULT: prepare vm_flags to allow more than 32bits Andrea Arcangeli
2014-10-07 9:03 ` Kirill A. Shutemov
2014-11-06 20:08 ` Konstantin Khlebnikov [this message]
2014-10-03 17:07 ` [PATCH 08/17] mm: madvise MADV_USERFAULT Andrea Arcangeli
2014-10-03 23:13 ` Mike Hommey
2014-10-06 17:24 ` Andrea Arcangeli
2014-10-07 10:36 ` Kirill A. Shutemov
2014-10-07 10:46 ` Dr. David Alan Gilbert
2014-10-07 10:52 ` [Qemu-devel] " Kirill A. Shutemov
2014-10-07 11:01 ` Dr. David Alan Gilbert
2014-10-07 11:30 ` Kirill A. Shutemov
2014-10-07 13:24 ` Andrea Arcangeli
2014-10-07 15:21 ` Kirill A. Shutemov
2014-10-03 17:07 ` [PATCH 09/17] mm: PT lock: export double_pt_lock/unlock Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 10/17] mm: rmap preparation for remap_anon_pages Andrea Arcangeli
2014-10-03 18:31 ` Linus Torvalds
2014-10-06 8:55 ` Dr. David Alan Gilbert
2014-10-06 16:41 ` Andrea Arcangeli
2014-10-07 12:47 ` Linus Torvalds
2014-10-07 14:19 ` Andrea Arcangeli
2014-10-07 15:52 ` Andrea Arcangeli
2014-10-07 15:54 ` Andy Lutomirski
2014-10-07 16:13 ` Peter Feiner
2014-10-07 16:56 ` Linus Torvalds
2014-10-07 17:07 ` Dr. David Alan Gilbert
2014-10-07 17:14 ` Paolo Bonzini
2014-10-07 17:25 ` Dr. David Alan Gilbert
2014-10-07 11:10 ` [Qemu-devel] " Kirill A. Shutemov
2014-10-07 13:37 ` Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 11/17] mm: swp_entry_swapcount Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 12/17] mm: sys_remap_anon_pages Andrea Arcangeli
2014-10-04 13:13 ` Andi Kleen
2014-10-06 17:00 ` Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 13/17] waitqueue: add nr wake parameter to __wake_up_locked_key Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 14/17] userfaultfd: add new syscall to provide memory externalization Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 15/17] userfaultfd: make userfaultfd_write non blocking Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 16/17] powerpc: add remap_anon_pages and userfaultfd Andrea Arcangeli
2014-10-03 17:08 ` [PATCH 17/17] userfaultfd: implement USERFAULTFD_RANGE_REGISTER|UNREGISTER Andrea Arcangeli
2014-10-27 9:32 ` [PATCH 00/17] RFC: userfault v2 zhanghailiang
2014-10-29 17:46 ` Andrea Arcangeli
2014-10-29 17:56 ` [Qemu-devel] " Peter Maydell
2014-11-21 20:14 ` Andrea Arcangeli
2014-11-21 23:05 ` Peter Maydell
2014-11-25 19:45 ` Andrea Arcangeli
2014-10-30 11:31 ` zhanghailiang
2014-10-30 12:49 ` Dr. David Alan Gilbert
2014-10-31 1:26 ` zhanghailiang
2014-11-19 18:49 ` Andrea Arcangeli
2014-11-20 2:54 ` zhanghailiang
2014-11-20 17:38 ` Andrea Arcangeli
2014-11-21 7:19 ` zhanghailiang
2014-10-31 2:23 ` Peter Feiner
2014-10-31 3:29 ` zhanghailiang
2014-10-31 4:38 ` zhanghailiang
2014-10-31 5:17 ` Andres Lagar-Cavilla
2014-10-31 8:11 ` zhanghailiang
2014-10-31 19:39 ` Peter Feiner
2014-11-01 8:48 ` zhanghailiang
2014-11-20 17:29 ` Andrea Arcangeli
2014-11-12 7:18 ` zhanghailiang
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