From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Kirill A. Shutemov" Subject: [PATCHv3, RFC 25/34] x86-64, mm: proper alignment mappings with hugepages Date: Fri, 5 Apr 2013 14:59:49 +0300 Message-ID: <1365163198-29726-26-git-send-email-kirill.shutemov@linux.intel.com> References: <1365163198-29726-1-git-send-email-kirill.shutemov@linux.intel.com> Cc: Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , Dave Hansen , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" To: Andrea Arcangeli , Andrew Morton Return-path: In-Reply-To: <1365163198-29726-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org From: "Kirill A. Shutemov" Make arch_get_unmapped_area() return unmapped area aligned to HPAGE_MASK if the file mapping can have huge pages. Signed-off-by: Kirill A. Shutemov --- arch/x86/kernel/sys_x86_64.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/sys_x86_64.c b/arch/x86/kernel/sys_x86_64.c index dbded5a..d97ab40 100644 --- a/arch/x86/kernel/sys_x86_64.c +++ b/arch/x86/kernel/sys_x86_64.c @@ -15,6 +15,7 @@ #include #include #include +#include #include #include @@ -34,6 +35,13 @@ static unsigned long get_align_mask(void) return va_align.mask; } +static inline unsigned long mapping_align_mask(struct address_space *mapping) +{ + if (mapping_can_have_hugepages(mapping)) + return PAGE_MASK & ~HPAGE_MASK; + return get_align_mask(); +} + unsigned long align_vdso_addr(unsigned long addr) { unsigned long align_mask = get_align_mask(); @@ -135,7 +143,7 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr, info.length = len; info.low_limit = begin; info.high_limit = end; - info.align_mask = filp ? get_align_mask() : 0; + info.align_mask = filp ? mapping_align_mask(filp->f_mapping) : 0; info.align_offset = pgoff << PAGE_SHIFT; return vm_unmapped_area(&info); } @@ -174,7 +182,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0, info.length = len; info.low_limit = PAGE_SIZE; info.high_limit = mm->mmap_base; - info.align_mask = filp ? get_align_mask() : 0; + info.align_mask = filp ? mapping_align_mask(filp->f_mapping) : 0; info.align_offset = pgoff << PAGE_SHIFT; addr = vm_unmapped_area(&info); if (!(addr & ~PAGE_MASK)) -- 1.7.10.4