Message ID | 20201002122204.1534411-5-hch@lst.de (mailing list archive) |
---|---|
State | New, archived |
Headers | show
Return-Path: <SRS0=pvy/=DJ=kvack.org=owner-linux-mm@kernel.org> Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id A17C26CB for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 2 Oct 2020 12:22:47 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 672DD20719 for <patchwork-linux-mm@patchwork.kernel.org>; Fri, 2 Oct 2020 12:22:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CwHiRIYo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 672DD20719 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 2AF8990000A; Fri, 2 Oct 2020 08:22:33 -0400 (EDT) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id 174D890000B; 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Series |
[01/11] mm: update the documentation for vfree
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expand
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diff --git a/mm/memory.c b/mm/memory.c index fcfc4ca36eba80..dcf2bb69fbf847 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -2420,13 +2420,15 @@ static int apply_to_pte_range(struct mm_struct *mm, pmd_t *pmd, arch_enter_lazy_mmu_mode(); - do { - if (create || !pte_none(*pte)) { - err = fn(pte++, addr, data); - if (err) - break; - } - } while (addr += PAGE_SIZE, addr != end); + if (fn) { + do { + if (create || !pte_none(*pte)) { + err = fn(pte++, addr, data); + if (err) + break; + } + } while (addr += PAGE_SIZE, addr != end); + } *mask |= PGTBL_PTE_MODIFIED; arch_leave_lazy_mmu_mode();
Besides calling the callback on each page, apply_to_page_range also has the effect of pre-faulting all PTEs for the range. To support callers that only need the pre-faulting, make the callback optional. Based on a patch from Minchan Kim <minchan@kernel.org>. Signed-off-by: Christoph Hellwig <hch@lst.de> --- mm/memory.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)