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https://github.com/torvalds/linux
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27d121d0ec
Patch series "powerpc/fadump: handle CMA activation failure appropriately", v3.
Commit 072355c1cf ("mm/cma: expose all pages to the buddy if
activation of an area fails") started exposing all pages to buddy
allocator on CMA activation failure. But there can be CMA users that
want to handle the reserved memory differently on CMA allocation
failure.
Provide an option to opt out from exposing pages to buddy for such
cases.
Link: https://lkml.kernel.org/r/20220117075246.36072-1-hbathini@linux.ibm.com
Link: https://lkml.kernel.org/r/20220117075246.36072-2-hbathini@linux.ibm.com
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mahesh Salgaonkar <mahesh@linux.ibm.com>
Cc: Sourabh Jain <sourabhjain@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __MM_CMA_H__
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#define __MM_CMA_H__
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#include <linux/debugfs.h>
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#include <linux/kobject.h>
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struct cma_kobject {
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struct kobject kobj;
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struct cma *cma;
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};
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struct cma {
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unsigned long base_pfn;
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unsigned long count;
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unsigned long *bitmap;
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unsigned int order_per_bit; /* Order of pages represented by one bit */
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spinlock_t lock;
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#ifdef CONFIG_CMA_DEBUGFS
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struct hlist_head mem_head;
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spinlock_t mem_head_lock;
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struct debugfs_u32_array dfs_bitmap;
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#endif
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char name[CMA_MAX_NAME];
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#ifdef CONFIG_CMA_SYSFS
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/* the number of CMA page successful allocations */
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atomic64_t nr_pages_succeeded;
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/* the number of CMA page allocation failures */
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atomic64_t nr_pages_failed;
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/* kobject requires dynamic object */
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struct cma_kobject *cma_kobj;
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#endif
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bool reserve_pages_on_error;
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};
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extern struct cma cma_areas[MAX_CMA_AREAS];
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extern unsigned cma_area_count;
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static inline unsigned long cma_bitmap_maxno(struct cma *cma)
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{
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return cma->count >> cma->order_per_bit;
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}
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#ifdef CONFIG_CMA_SYSFS
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void cma_sysfs_account_success_pages(struct cma *cma, unsigned long nr_pages);
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void cma_sysfs_account_fail_pages(struct cma *cma, unsigned long nr_pages);
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#else
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static inline void cma_sysfs_account_success_pages(struct cma *cma,
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unsigned long nr_pages) {};
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static inline void cma_sysfs_account_fail_pages(struct cma *cma,
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unsigned long nr_pages) {};
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#endif
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#endif
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