/* * Copyright 2006 PathScale, Inc. All Rights Reserved. * * This file is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */ #include #include /** * __iowrite32_copy - copy data to MMIO space, in 32-bit units * @to: destination, in MMIO space (must be 32-bit aligned) * @from: source (must be 32-bit aligned) * @count: number of 32-bit quantities to copy * * Copy data from kernel space to MMIO space, in units of 32 bits at a * time. Order of access is not guaranteed, nor is a memory barrier * performed afterwards. */ void __attribute__((weak)) __iowrite32_copy(void __iomem *to, const void *from, size_t count) { u32 __iomem *dst = to; const u32 *src = from; const u32 *end = src + count; while (src < end) __raw_writel(*src++, dst++); } EXPORT_SYMBOL_GPL(__iowrite32_copy); /** * __ioread32_copy - copy data from MMIO space, in 32-bit units * @to: destination (must be 32-bit aligned) * @from: source, in MMIO space (must be 32-bit aligned) * @count: number of 32-bit quantities to copy * * Copy data from MMIO space to kernel space, in units of 32 bits at a * time. Order of access is not guaranteed, nor is a memory barrier * performed afterwards. */ void __ioread32_copy(void *to, const void __iomem *from, size_t count) { u32 *dst = to; const u32 __iomem *src = from; const u32 __iomem *end = src + count; while (src < end) *dst++ = __raw_readl(src++); } EXPORT_SYMBOL_GPL(__ioread32_copy); /** * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units * @to: destination, in MMIO space (must be 64-bit aligned) * @from: source (must be 64-bit aligned) * @count: number of 64-bit quantities to copy * * Copy data from kernel space to MMIO space, in units of 32 or 64 bits at a * time. Order of access is not guaranteed, nor is a memory barrier * performed afterwards. */ void __attribute__((weak)) __iowrite64_copy(void __iomem *to, const void *from, size_t count) { #ifdef CONFIG_64BIT u64 __iomem *dst = to; const u64 *src = from; const u64 *end = src + count; while (src < end) __raw_writeq(*src++, dst++); #else __iowrite32_copy(to, from, count * 2); #endif } EXPORT_SYMBOL_GPL(__iowrite64_copy); 'q' value=''/>
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authorzhong jiang <zhongjiang@huawei.com>2017-01-24 15:18:52 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-24 16:26:14 -0800
commit3277953de2f31dd03c6375e9a9f680ac37fc9d27 (patch)
tree6ba22924faa1b82ef2f0277db10a3f5abdc44157 /tools/arch/m32r/include
parent3705ccfdd1e8b539225ce20e3925a945cc788d67 (diff)
mm: do not export ioremap_page_range symbol for external module
Recently, I've found cases in which ioremap_page_range was used incorrectly, in external modules, leading to crashes. This can be partly attributed to the fact that ioremap_page_range is lower-level, with fewer protections, as compared to the other functions that an external module would typically call. Those include: ioremap_cache ioremap_nocache ioremap_prot ioremap_uc ioremap_wc ioremap_wt ...each of which wraps __ioremap_caller, which in turn provides a safer way to achieve the mapping. Therefore, stop EXPORT-ing ioremap_page_range. Link: http://lkml.kernel.org/r/1485173220-29010-1-git-send-email-zhongjiang@huawei.com Signed-off-by: zhong jiang <zhongjiang@huawei.com> Reviewed-by: John Hubbard <jhubbard@nvidia.com> Suggested-by: John Hubbard <jhubbard@nvidia.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'tools/arch/m32r/include')