diff --git a/include/linux/cma.h b/include/linux/cma.h index b1ba94f1cc9c5065e423ccc566fc408d3d35eb33..90fd742fd1ef5436f100bea5d3bcbdafafcacf33 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -58,4 +58,6 @@ extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count); extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data); + +extern void cma_reserve_pages_on_error(struct cma *cma); #endif diff --git a/mm/cma.c b/mm/cma.c index 5a2cd58516589132ae79c5b650823f429bcaf7ae..eaa4b5c920a20b53cf819a541ebdd652e0a14987 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -131,8 +131,10 @@ static void __init cma_activate_area(struct cma *cma) bitmap_free(cma->bitmap); out_error: /* Expose all pages to the buddy, they are useless for CMA. */ - for (pfn = base_pfn; pfn < base_pfn + cma->count; pfn++) - free_reserved_page(pfn_to_page(pfn)); + if (!cma->reserve_pages_on_error) { + for (pfn = base_pfn; pfn < base_pfn + cma->count; pfn++) + free_reserved_page(pfn_to_page(pfn)); + } totalcma_pages -= cma->count; cma->count = 0; pr_err("CMA area %s could not be activated\n", cma->name); @@ -150,6 +152,11 @@ static int __init cma_init_reserved_areas(void) } core_initcall(cma_init_reserved_areas); +void __init cma_reserve_pages_on_error(struct cma *cma) +{ + cma->reserve_pages_on_error = true; +} + /** * cma_init_reserved_mem() - create custom contiguous area from reserved memory * @base: Base address of the reserved area diff --git a/mm/cma.h b/mm/cma.h index 2c775877eae240279d08adc18591a058e34e755e..88a0595670b766cd9780476f7dacb71fd9979e34 100644 --- a/mm/cma.h +++ b/mm/cma.h @@ -30,6 +30,7 @@ struct cma { /* kobject requires dynamic object */ struct cma_kobject *cma_kobj; #endif + bool reserve_pages_on_error; }; extern struct cma cma_areas[MAX_CMA_AREAS];