From: Nick Desaulniers <ndesaulniers@google.com>
To: Will Deacon <will@kernel.org>
Cc: kernel-team <kernel-team@android.com>, Jan Kara <jack@suse.cz>,
Minchan Kim <minchan@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Hugh Dickins <hughd@google.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Vinayak Menon <vinmenon@codeaurora.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v4 7/8] mm: Use static initialisers for immutable fields of 'struct vm_fault'
Date: Wed, 20 Jan 2021 10:21:33 -0800 [thread overview]
Message-ID: <CAKwvOdkqGy9O8yAnyeJO-P3WssRa1=OS=Q-T2ZV1vGwdwi=6+A@mail.gmail.com> (raw)
In-Reply-To: <20210120173612.20913-8-will@kernel.org>
On Wed, Jan 20, 2021 at 9:36 AM Will Deacon <will@kernel.org> wrote:
>
> In preparation for const-ifying the anonymous struct field of
> 'struct vm_fault', ensure that it is initialised using static
> initialisers.
FWIW these are known as "designated initializers", ie.
struct foo my_foo = {
.bar = 42,
};
https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
>
> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> Cc: Linus Torvalds <torvalds@linux-foundation.org>
> Signed-off-by: Will Deacon <will@kernel.org>
> ---
> mm/shmem.c | 6 +++---
> mm/swapfile.c | 11 ++++++-----
> 2 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/mm/shmem.c b/mm/shmem.c
> index 7c6b6d8f6c39..1b254fbfdf52 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -1520,11 +1520,11 @@ static struct page *shmem_swapin(swp_entry_t swap, gfp_t gfp,
> {
> struct vm_area_struct pvma;
> struct page *page;
> - struct vm_fault vmf;
> + struct vm_fault vmf = {
> + .vma = &pvma,
> + };
>
> shmem_pseudo_vma_init(&pvma, info, index);
> - vmf.vma = &pvma;
> - vmf.address = 0;
> page = swap_cluster_readahead(swap, gfp, &vmf);
> shmem_pseudo_vma_destroy(&pvma);
>
> diff --git a/mm/swapfile.c b/mm/swapfile.c
> index 9fffc5af29d1..2b570a566276 100644
> --- a/mm/swapfile.c
> +++ b/mm/swapfile.c
> @@ -1951,8 +1951,6 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
> si = swap_info[type];
> pte = pte_offset_map(pmd, addr);
> do {
> - struct vm_fault vmf;
> -
> if (!is_swap_pte(*pte))
> continue;
>
> @@ -1968,9 +1966,12 @@ static int unuse_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
> swap_map = &si->swap_map[offset];
> page = lookup_swap_cache(entry, vma, addr);
> if (!page) {
> - vmf.vma = vma;
> - vmf.address = addr;
> - vmf.pmd = pmd;
> + struct vm_fault vmf = {
> + .vma = vma,
> + .address = addr,
> + .pmd = pmd,
> + };
> +
> page = swapin_readahead(entry, GFP_HIGHUSER_MOVABLE,
> &vmf);
> }
> --
> 2.30.0.284.gd98b1dd5eaa7-goog
>
--
Thanks,
~Nick Desaulniers
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next prev parent reply other threads:[~2021-01-20 18:23 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 17:36 [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon
2021-01-20 17:36 ` [PATCH v4 1/8] mm: Cleanup faultaround and finish_fault() codepaths Will Deacon
2021-01-20 17:36 ` [PATCH v4 2/8] mm: Allow architectures to request 'old' entries when prefaulting Will Deacon
2021-01-20 17:36 ` [PATCH v4 3/8] arm64: mm: Implement arch_wants_old_prefaulted_pte() Will Deacon
2021-01-20 17:36 ` [PATCH v4 4/8] mm: Move immutable fields of 'struct vm_fault' into anonymous struct Will Deacon
2021-01-20 18:13 ` Nick Desaulniers
2021-01-21 12:48 ` Will Deacon
2021-01-20 17:36 ` [PATCH v4 5/8] mm: Pass 'address' to map to do_set_pte() and drop FAULT_FLAG_PREFAULT Will Deacon
2021-01-20 17:36 ` [PATCH v4 6/8] mm: Avoid modifying vmf.address in __collapse_huge_page_swapin() Will Deacon
2021-01-20 17:36 ` [PATCH v4 7/8] mm: Use static initialisers for immutable fields of 'struct vm_fault' Will Deacon
2021-01-20 18:21 ` Nick Desaulniers [this message]
2021-01-21 12:50 ` Will Deacon
2021-01-20 17:36 ` [PATCH v4 8/8] mm: Mark anonymous struct field of 'struct vm_fault' as 'const' Will Deacon
2021-01-20 18:27 ` Nick Desaulniers
2021-01-20 19:02 ` Linus Torvalds
2021-01-21 13:11 ` Will Deacon
2021-01-21 19:24 ` Nick Desaulniers
2021-01-21 21:28 ` Will Deacon
2021-01-22 19:10 ` Nick Desaulniers
2021-01-22 19:27 ` Will Deacon
2021-01-22 17:47 ` Linus Torvalds
2021-01-26 23:08 ` [PATCH v4 0/8] Create 'old' ptes for faultaround mappings on arm64 with hardware access flag Will Deacon
2021-01-26 23:28 ` Hugh Dickins
2021-01-27 17:16 ` Will Deacon
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