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Date: Thu, 31 Oct 2019 11:18:44 -0700
From: Ira Weiny <ira.weiny@...el.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Al Viro <viro@...iv.linux.org.uk>,
Alex Williamson <alex.williamson@...hat.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Björn Töpel <bjorn.topel@...el.com>,
Christoph Hellwig <hch@...radead.org>,
Dan Williams <dan.j.williams@...el.com>,
Daniel Vetter <daniel@...ll.ch>,
Dave Chinner <david@...morbit.com>,
David Airlie <airlied@...ux.ie>,
"David S . Miller" <davem@...emloft.net>, Jan Kara <jack@...e.cz>,
Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
Jonathan Corbet <corbet@....net>,
Jérôme Glisse <jglisse@...hat.com>,
Magnus Karlsson <magnus.karlsson@...el.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Michal Hocko <mhocko@...e.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Paul Mackerras <paulus@...ba.org>,
Shuah Khan <shuah@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>, bpf@...r.kernel.org,
dri-devel@...ts.freedesktop.org, kvm@...r.kernel.org,
linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-media@...r.kernel.org, linux-rdma@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 01/19] mm/gup: pass flags arg to __gup_device_* functions
On Wed, Oct 30, 2019 at 03:49:12PM -0700, John Hubbard wrote:
> A subsequent patch requires access to gup flags, so
> pass the flags argument through to the __gup_device_*
> functions.
>
> Also placate checkpatch.pl by shortening a nearby line.
>
Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
> mm/gup.c | 28 ++++++++++++++++++----------
> 1 file changed, 18 insertions(+), 10 deletions(-)
>
> diff --git a/mm/gup.c b/mm/gup.c
> index 8f236a335ae9..85caf76b3012 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -1890,7 +1890,8 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
>
> #if defined(CONFIG_ARCH_HAS_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
> static int __gup_device_huge(unsigned long pfn, unsigned long addr,
> - unsigned long end, struct page **pages, int *nr)
> + unsigned long end, unsigned int flags,
> + struct page **pages, int *nr)
> {
> int nr_start = *nr;
> struct dev_pagemap *pgmap = NULL;
> @@ -1916,13 +1917,14 @@ static int __gup_device_huge(unsigned long pfn, unsigned long addr,
> }
>
> static int __gup_device_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
> - unsigned long end, struct page **pages, int *nr)
> + unsigned long end, unsigned int flags,
> + struct page **pages, int *nr)
> {
> unsigned long fault_pfn;
> int nr_start = *nr;
>
> fault_pfn = pmd_pfn(orig) + ((addr & ~PMD_MASK) >> PAGE_SHIFT);
> - if (!__gup_device_huge(fault_pfn, addr, end, pages, nr))
> + if (!__gup_device_huge(fault_pfn, addr, end, flags, pages, nr))
> return 0;
>
> if (unlikely(pmd_val(orig) != pmd_val(*pmdp))) {
> @@ -1933,13 +1935,14 @@ static int __gup_device_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
> }
>
> static int __gup_device_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
> - unsigned long end, struct page **pages, int *nr)
> + unsigned long end, unsigned int flags,
> + struct page **pages, int *nr)
> {
> unsigned long fault_pfn;
> int nr_start = *nr;
>
> fault_pfn = pud_pfn(orig) + ((addr & ~PUD_MASK) >> PAGE_SHIFT);
> - if (!__gup_device_huge(fault_pfn, addr, end, pages, nr))
> + if (!__gup_device_huge(fault_pfn, addr, end, flags, pages, nr))
> return 0;
>
> if (unlikely(pud_val(orig) != pud_val(*pudp))) {
> @@ -1950,14 +1953,16 @@ static int __gup_device_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
> }
> #else
> static int __gup_device_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
> - unsigned long end, struct page **pages, int *nr)
> + unsigned long end, unsigned int flags,
> + struct page **pages, int *nr)
> {
> BUILD_BUG();
> return 0;
> }
>
> static int __gup_device_huge_pud(pud_t pud, pud_t *pudp, unsigned long addr,
> - unsigned long end, struct page **pages, int *nr)
> + unsigned long end, unsigned int flags,
> + struct page **pages, int *nr)
> {
> BUILD_BUG();
> return 0;
> @@ -2062,7 +2067,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
> if (pmd_devmap(orig)) {
> if (unlikely(flags & FOLL_LONGTERM))
> return 0;
> - return __gup_device_huge_pmd(orig, pmdp, addr, end, pages, nr);
> + return __gup_device_huge_pmd(orig, pmdp, addr, end, flags,
> + pages, nr);
> }
>
> refs = 0;
> @@ -2092,7 +2098,8 @@ static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr,
> }
>
> static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
> - unsigned long end, unsigned int flags, struct page **pages, int *nr)
> + unsigned long end, unsigned int flags,
> + struct page **pages, int *nr)
> {
> struct page *head, *page;
> int refs;
> @@ -2103,7 +2110,8 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr,
> if (pud_devmap(orig)) {
> if (unlikely(flags & FOLL_LONGTERM))
> return 0;
> - return __gup_device_huge_pud(orig, pudp, addr, end, pages, nr);
> + return __gup_device_huge_pud(orig, pudp, addr, end, flags,
> + pages, nr);
> }
>
> refs = 0;
> --
> 2.23.0
>
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