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Thu, 27 Feb 2020 16:47:22 -0800 (PST) Received: from phantasmagoria.svl.corp.google.com ([2620:15c:2c4:201:2b0a:8c1:6a84:1aa0]) by smtp.gmail.com with ESMTPSA id e4sm4525500pfi.99.2020.02.27.16.47.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Feb 2020 16:47:21 -0800 (PST) From: Arjun Roy To: davem@davemloft.net, akpm@linux-foundation.org, linux-mm@kvack.org Cc: arjunroy@google.com, soheil@google.com, edumazet@google.com, sfr@canb.auug.org.au, geert@linux-m68k.org Subject: [PATCH mm 2/2] mm: vm_insert_pages() checks if pte_index defined. Date: Thu, 27 Feb 2020 16:46:57 -0800 Message-Id: <20200228004657.79943-2-arjunroy.kdev@gmail.com> X-Mailer: git-send-email 2.25.1.481.gfbce0eb801-goog In-Reply-To: <20200228004657.79943-1-arjunroy.kdev@gmail.com> References: <20200228004657.79943-1-arjunroy.kdev@gmail.com> MIME-Version: 1.0 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: From: Arjun Roy pte_index() is either defined as a macro (e.g. sparc64) or as an inlined function (e.g. x86). vm_insert_pages() depends on pte_index but it is not defined on all platforms (e.g. m68k). To fix compilation of vm_insert_pages() on architectures not providing pte_index(), we perform the following fix: 0. For platforms where it is meaningful, and defined as a macro, no change is needed. 1. For platforms where it is meaningful and defined as an inlined function, and we want to use it with vm_insert_pages(), we define a degenerate macro of the form: #define pte_index pte_index 2. vm_insert_pages() checks for the existence of a pte_index macro definition. If found, it implements a batched insert. If not found, it devolves to calling vm_insert_page() in a loop. This patch implements step 2. Signed-off-by: Arjun Roy --- mm/memory.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/mm/memory.c b/mm/memory.c index d6f834f7d145..33631a5b5c3f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -1500,8 +1500,9 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr, return retval; } +#ifdef pte_index /* insert_pages() amortizes the cost of spinlock operations - * when inserting pages in a loop. + * when inserting pages in a loop. Arch *must* define pte_index. */ static int insert_pages(struct vm_area_struct *vma, unsigned long addr, struct page **pages, unsigned long *num, pgprot_t prot) @@ -1556,6 +1557,7 @@ static int insert_pages(struct vm_area_struct *vma, unsigned long addr, *num = remaining_pages_total; return ret; } +#endif /* ifdef pte_index */ /** * vm_insert_pages - insert multiple pages into user vma, batching the pmd lock. @@ -1575,6 +1577,7 @@ static int insert_pages(struct vm_area_struct *vma, unsigned long addr, int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr, struct page **pages, unsigned long *num) { +#ifdef pte_index const unsigned long end_addr = addr + (*num * PAGE_SIZE) - 1; if (addr < vma->vm_start || end_addr >= vma->vm_end) @@ -1586,6 +1589,18 @@ int vm_insert_pages(struct vm_area_struct *vma, unsigned long addr, } /* Defer page refcount checking till we're about to map that page. */ return insert_pages(vma, addr, pages, num, vma->vm_page_prot); +#else + unsigned long idx = 0, pgcount = *num; + int err; + + for (; idx < pgcount; ++idx) { + err = vm_insert_page(vma, addr + (PAGE_SIZE * idx), pages[idx]); + if (err) + break; + } + *num = pgcount - idx; + return err; +#endif /* ifdef pte_index */ } EXPORT_SYMBOL(vm_insert_pages);