From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f173.google.com (mail-ob0-f173.google.com [209.85.214.173]) by kanga.kvack.org (Postfix) with ESMTP id ADE096B0070 for ; Mon, 9 Feb 2015 17:46:02 -0500 (EST) Received: by mail-ob0-f173.google.com with SMTP id uy5so28466460obc.4 for ; Mon, 09 Feb 2015 14:46:02 -0800 (PST) Received: from g4t3427.houston.hp.com (g4t3427.houston.hp.com. [15.201.208.55]) by mx.google.com with ESMTPS id i1si6586580oep.77.2015.02.09.14.46.01 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 09 Feb 2015 14:46:01 -0800 (PST) From: Toshi Kani Subject: [PATCH v2 4/7] mm: Change vunmap to tear down huge KVA mappings Date: Mon, 9 Feb 2015 15:45:32 -0700 Message-Id: <1423521935-17454-5-git-send-email-toshi.kani@hp.com> In-Reply-To: <1423521935-17454-1-git-send-email-toshi.kani@hp.com> References: <1423521935-17454-1-git-send-email-toshi.kani@hp.com> Sender: owner-linux-mm@kvack.org List-ID: To: akpm@linux-foundation.org, hpa@zytor.com, tglx@linutronix.de, mingo@redhat.com, arnd@arndb.de Cc: linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org, Elliott@hp.com, Toshi Kani Change vunmap_pmd_range() and vunmap_pud_range() to tear down huge KVA mappings when they are set. These changes are only enabled when CONFIG_HAVE_ARCH_HUGE_VMAP is defined. Signed-off-by: Toshi Kani --- include/asm-generic/pgtable.h | 4 ++++ mm/vmalloc.c | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index 7dc3838..1204ea6 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -850,9 +850,13 @@ static inline void pmdp_set_numa(struct mm_struct *mm, unsigned long addr, #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot); void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot); +int pud_clear_huge(pud_t *pud); +int pmd_clear_huge(pmd_t *pmd); #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ static inline void pud_set_huge(pud_t *pud, phys_addr_t addr, pgprot_t prot) { } static inline void pmd_set_huge(pmd_t *pmd, phys_addr_t addr, pgprot_t prot) { } +static inline int pud_clear_huge(pud_t *pud) { return 0; } +static inline int pmd_clear_huge(pmd_t *pmd) { return 0; } #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ #endif /* _ASM_GENERIC_PGTABLE_H */ diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 40ea214..dd53a9d 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -75,6 +75,8 @@ static void vunmap_pmd_range(pud_t *pud, unsigned long addr, unsigned long end) pmd = pmd_offset(pud, addr); do { next = pmd_addr_end(addr, end); + if (pmd_clear_huge(pmd)) + continue; if (pmd_none_or_clear_bad(pmd)) continue; vunmap_pte_range(pmd, addr, next); @@ -89,6 +91,8 @@ static void vunmap_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end) pud = pud_offset(pgd, addr); do { next = pud_addr_end(addr, end); + if (pud_clear_huge(pud)) + continue; if (pud_none_or_clear_bad(pud)) continue; vunmap_pmd_range(pud, addr, next); -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org