From mboxrd@z Thu Jan 1 00:00:00 1970 From: ira.weiny@intel.com Date: Wed, 13 Feb 2019 23:04:50 +0000 Subject: [PATCH V2 2/7] mm/gup: Change write parameter to flags in fast walk Message-Id: <20190213230455.5605-3-ira.weiny@intel.com> List-Id: References: <20190211201643.7599-1-ira.weiny@intel.com> <20190213230455.5605-1-ira.weiny@intel.com> In-Reply-To: <20190213230455.5605-1-ira.weiny@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, kvm@vger.kernel.org, linux-fpga@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-scsi@vger.kernel.org, devel@driverdev.osuosl.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-fbdev@vger.kernel.org, xen-devel@lists.xenproject.org, devel@lists.orangefs.org, linux-mm@kvack.org, ceph-devel@vger.kernel.org, rds-devel@oss.oracle.com Cc: Martin Brandenburg , Rich Felker , David Hildenbrand , David Airlie , Jason Wang , =?UTF-8?q?Kai=20M=C3=A4kisara?= , Michal Hocko , Ira Weiny , Ben Chan , Rob Springer , Todd Poynor , Yoshinori Sato , "Michael S. Tsirkin" , Jason Gunthorpe , Ingo Molnar , Matt Porter , Wu Hao , Alan Tull , John Hubbard , "James E.J. Bottomley" , Alex Williamson , Stefano Stabellini , Borislav Petkov From: Ira Weiny In order to support more options in the GUP fast walk, change the write parameter to flags throughout the call stack. This patch does not change functionality and passes FOLL_WRITE where write was previously used. Signed-off-by: Ira Weiny --- mm/gup.c | 52 ++++++++++++++++++++++++++-------------------------- 1 file changed, 26 insertions(+), 26 deletions(-) diff --git a/mm/gup.c b/mm/gup.c index ee96eaff118c..681388236106 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1417,7 +1417,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages) #ifdef CONFIG_ARCH_HAS_PTE_SPECIAL static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) + unsigned int flags, struct page **pages, int *nr) { struct dev_pagemap *pgmap = NULL; int nr_start = *nr, ret = 0; @@ -1435,7 +1435,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, if (pte_protnone(pte)) goto pte_unmap; - if (!pte_access_permitted(pte, write)) + if (!pte_access_permitted(pte, flags & FOLL_WRITE)) goto pte_unmap; if (pte_devmap(pte)) { @@ -1487,7 +1487,7 @@ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, * useful to have gup_huge_pmd even if we can't operate on ptes. */ static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) + unsigned int flags, struct page **pages, int *nr) { return 0; } @@ -1570,12 +1570,12 @@ static int __gup_device_huge_pud(pud_t pud, pud_t *pudp, unsigned long addr, #endif static int gup_huge_pmd(pmd_t orig, pmd_t *pmdp, unsigned long addr, - unsigned long end, int write, struct page **pages, int *nr) + unsigned long end, unsigned int flags, struct page **pages, int *nr) { struct page *head, *page; int refs; - if (!pmd_access_permitted(orig, write)) + if (!pmd_access_permitted(orig, flags & FOLL_WRITE)) return 0; if (pmd_devmap(orig)) @@ -1608,12 +1608,12 @@ 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, int write, struct page **pages, int *nr) + unsigned long end, unsigned int flags, struct page **pages, int *nr) { struct page *head, *page; int refs; - if (!pud_access_permitted(orig, write)) + if (!pud_access_permitted(orig, flags & FOLL_WRITE)) return 0; if (pud_devmap(orig)) @@ -1646,13 +1646,13 @@ static int gup_huge_pud(pud_t orig, pud_t *pudp, unsigned long addr, } static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr, - unsigned long end, int write, + unsigned long end, unsigned int flags, struct page **pages, int *nr) { int refs; struct page *head, *page; - if (!pgd_access_permitted(orig, write)) + if (!pgd_access_permitted(orig, flags & FOLL_WRITE)) return 0; BUILD_BUG_ON(pgd_devmap(orig)); @@ -1683,7 +1683,7 @@ static int gup_huge_pgd(pgd_t orig, pgd_t *pgdp, unsigned long addr, } static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) + unsigned int flags, struct page **pages, int *nr) { unsigned long next; pmd_t *pmdp; @@ -1705,7 +1705,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, if (pmd_protnone(pmd)) return 0; - if (!gup_huge_pmd(pmd, pmdp, addr, next, write, + if (!gup_huge_pmd(pmd, pmdp, addr, next, flags, pages, nr)) return 0; @@ -1715,9 +1715,9 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, * pmd format and THP pmd format */ if (!gup_huge_pd(__hugepd(pmd_val(pmd)), addr, - PMD_SHIFT, next, write, pages, nr)) + PMD_SHIFT, next, flags, pages, nr)) return 0; - } else if (!gup_pte_range(pmd, addr, next, write, pages, nr)) + } else if (!gup_pte_range(pmd, addr, next, flags, pages, nr)) return 0; } while (pmdp++, addr = next, addr != end); @@ -1725,7 +1725,7 @@ static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, } static int gup_pud_range(p4d_t p4d, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) + unsigned int flags, struct page **pages, int *nr) { unsigned long next; pud_t *pudp; @@ -1738,14 +1738,14 @@ static int gup_pud_range(p4d_t p4d, unsigned long addr, unsigned long end, if (pud_none(pud)) return 0; if (unlikely(pud_huge(pud))) { - if (!gup_huge_pud(pud, pudp, addr, next, write, + if (!gup_huge_pud(pud, pudp, addr, next, flags, pages, nr)) return 0; } else if (unlikely(is_hugepd(__hugepd(pud_val(pud))))) { if (!gup_huge_pd(__hugepd(pud_val(pud)), addr, - PUD_SHIFT, next, write, pages, nr)) + PUD_SHIFT, next, flags, pages, nr)) return 0; - } else if (!gup_pmd_range(pud, addr, next, write, pages, nr)) + } else if (!gup_pmd_range(pud, addr, next, flags, pages, nr)) return 0; } while (pudp++, addr = next, addr != end); @@ -1753,7 +1753,7 @@ static int gup_pud_range(p4d_t p4d, unsigned long addr, unsigned long end, } static int gup_p4d_range(pgd_t pgd, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) + unsigned int flags, struct page **pages, int *nr) { unsigned long next; p4d_t *p4dp; @@ -1768,9 +1768,9 @@ static int gup_p4d_range(pgd_t pgd, unsigned long addr, unsigned long end, BUILD_BUG_ON(p4d_huge(p4d)); if (unlikely(is_hugepd(__hugepd(p4d_val(p4d))))) { if (!gup_huge_pd(__hugepd(p4d_val(p4d)), addr, - P4D_SHIFT, next, write, pages, nr)) + P4D_SHIFT, next, flags, pages, nr)) return 0; - } else if (!gup_pud_range(p4d, addr, next, write, pages, nr)) + } else if (!gup_pud_range(p4d, addr, next, flags, pages, nr)) return 0; } while (p4dp++, addr = next, addr != end); @@ -1778,7 +1778,7 @@ static int gup_p4d_range(pgd_t pgd, unsigned long addr, unsigned long end, } static void gup_pgd_range(unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) + unsigned int flags, struct page **pages, int *nr) { unsigned long next; pgd_t *pgdp; @@ -1791,14 +1791,14 @@ static void gup_pgd_range(unsigned long addr, unsigned long end, if (pgd_none(pgd)) return; if (unlikely(pgd_huge(pgd))) { - if (!gup_huge_pgd(pgd, pgdp, addr, next, write, + if (!gup_huge_pgd(pgd, pgdp, addr, next, flags, pages, nr)) return; } else if (unlikely(is_hugepd(__hugepd(pgd_val(pgd))))) { if (!gup_huge_pd(__hugepd(pgd_val(pgd)), addr, - PGDIR_SHIFT, next, write, pages, nr)) + PGDIR_SHIFT, next, flags, pages, nr)) return; - } else if (!gup_p4d_range(pgd, addr, next, write, pages, nr)) + } else if (!gup_p4d_range(pgd, addr, next, flags, pages, nr)) return; } while (pgdp++, addr = next, addr != end); } @@ -1852,7 +1852,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write, if (gup_fast_permitted(start, nr_pages)) { local_irq_save(flags); - gup_pgd_range(start, end, write, pages, &nr); + gup_pgd_range(start, end, write ? FOLL_WRITE : 0, pages, &nr); local_irq_restore(flags); } @@ -1894,7 +1894,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write, if (gup_fast_permitted(start, nr_pages)) { local_irq_disable(); - gup_pgd_range(addr, end, write, pages, &nr); + gup_pgd_range(addr, end, write ? FOLL_WRITE : 0, pages, &nr); local_irq_enable(); ret = nr; } -- 2.20.1