mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 22:24:09 +08:00
18e98e56f4
Patch series "mm: fix the names of general cma and hugetlb cma", v2. The current code of CMA can only work when users pass a const string as name parameter. we need to fix the way to handle names in CMA. On the other hand, to avoid name conflicts after enabling CMA_DEBUGFS, each hugetlb should get a different CMA name. This patch (of 2): If users give a name saved in stack, the current code will generate magic pointer. if users don't give a name(NULL), kasprintf() will always return NULL as we are at the early stage. that means cma_init_reserved_mem() will return -ENOMEM if users set name parameter as NULL. [natechancellor@gmail.com: return cma->name directly in cma_get_name] Link: https://github.com/ClangBuiltLinux/linux/issues/1063 Link: http://lkml.kernel.org/r/20200623015840.621964-1-natechancellor@gmail.com Signed-off-by: Barry Song <song.bao.hua@hisilicon.com> Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Roman Gushchin <guro@fb.com> Link: http://lkml.kernel.org/r/20200616223131.33828-2-song.bao.hua@hisilicon.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
32 lines
671 B
C
32 lines
671 B
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __MM_CMA_H__
|
|
#define __MM_CMA_H__
|
|
|
|
#include <linux/debugfs.h>
|
|
|
|
#define CMA_MAX_NAME 64
|
|
|
|
struct cma {
|
|
unsigned long base_pfn;
|
|
unsigned long count;
|
|
unsigned long *bitmap;
|
|
unsigned int order_per_bit; /* Order of pages represented by one bit */
|
|
struct mutex lock;
|
|
#ifdef CONFIG_CMA_DEBUGFS
|
|
struct hlist_head mem_head;
|
|
spinlock_t mem_head_lock;
|
|
struct debugfs_u32_array dfs_bitmap;
|
|
#endif
|
|
char name[CMA_MAX_NAME];
|
|
};
|
|
|
|
extern struct cma cma_areas[MAX_CMA_AREAS];
|
|
extern unsigned cma_area_count;
|
|
|
|
static inline unsigned long cma_bitmap_maxno(struct cma *cma)
|
|
{
|
|
return cma->count >> cma->order_per_bit;
|
|
}
|
|
|
|
#endif
|