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229a08a4f4
The MAX_CMA_AREAS could be set to 0, which would result in code that would
attempt to operate beyond the end of a zero-sized array. If CONFIG_CMA
is disabled, just remove this code entirely. Found when building arm
on GCC 10.x for several defconfigs (e.g. axm55xx_defconfig) under
-Warray-bounds:
arch/arm/mm/dma-mapping.c:396:22: warning: array subscript <unknown> is outside array bounds of 'struct dma_contig_early_reserve[0]' [-Warray-bounds]
396 | dma_mmu_remap[dma_mmu_remap_num].size = size;
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~
arch/arm/mm/dma-mapping.c:389:40: note: while referencing 'dma_mmu_remap'
389 | static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata;
| ^~~~~~~~~~~~~
Cc: Russell King <linux@armlinux.org.uk>
Cc: Logan Gunthorpe <logang@deltatee.com>
Cc: Martin Oliveira <martin.oliveira@eideticom.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Hari Bathini <hbathini@linux.ibm.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/all/6243ee60.1c69fb81.16de6.7dbf@mx.google.com/
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/lkml/20220310070041.GA24874@lst.de
Reviewed-by: David Hildenbrand <david@redhat.com>
Link: https://lore.kernel.org/lkml/9059fa71-330f-f04f-b155-2850abb72a71@redhat.com
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __CMA_H__
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#define __CMA_H__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/numa.h>
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/*
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* There is always at least global CMA area and a few optional
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* areas configured in kernel .config.
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*/
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#ifdef CONFIG_CMA_AREAS
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#define MAX_CMA_AREAS (1 + CONFIG_CMA_AREAS)
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#endif
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#define CMA_MAX_NAME 64
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struct cma;
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extern unsigned long totalcma_pages;
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extern phys_addr_t cma_get_base(const struct cma *cma);
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extern unsigned long cma_get_size(const struct cma *cma);
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extern const char *cma_get_name(const struct cma *cma);
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extern int __init cma_declare_contiguous_nid(phys_addr_t base,
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phys_addr_t size, phys_addr_t limit,
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phys_addr_t alignment, unsigned int order_per_bit,
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bool fixed, const char *name, struct cma **res_cma,
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int nid);
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static inline int __init cma_declare_contiguous(phys_addr_t base,
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phys_addr_t size, phys_addr_t limit,
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phys_addr_t alignment, unsigned int order_per_bit,
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bool fixed, const char *name, struct cma **res_cma)
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{
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return cma_declare_contiguous_nid(base, size, limit, alignment,
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order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
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}
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extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
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unsigned int order_per_bit,
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const char *name,
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struct cma **res_cma);
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extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
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bool no_warn);
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extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
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extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
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extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
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#endif
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