Re: [PATCH 26/26] x86/mm: allow to have userspace mappings above 47-bits
From: Aneesh Kumar K.V <hidden>
Date: 2017-03-20 05:10:36
Also in:
linux-mm, lkml
"Kirill A. Shutemov" [off-list ref] writes: @@ -168,6 +182,10 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
quoted hunk ↗ jump to hunk
unsigned long addr = addr0; struct vm_unmapped_area_info info; + addr = mpx_unmapped_area_check(addr, len, flags); + if (IS_ERR_VALUE(addr)) + return addr; + /* requested length too big for entire address space */ if (len > TASK_SIZE) return -ENOMEM;@@ -192,6 +210,14 @@ 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; + + /* + * If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area + * in the full address space. + */ + if (addr > DEFAULT_MAP_WINDOW) + info.high_limit += TASK_SIZE - DEFAULT_MAP_WINDOW; +
Is this ok for 32 bit application ?
info.align_mask = 0;
info.align_offset = pgoff << PAGE_SHIFT;
if (filp) {-aneesh -- 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: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>