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mm/mm_init.c: remove the useless dma_reserve

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Now nobody calls set_dma_reserve() to set value for dma_reserve, remove
set_dma_reserve(), global variable dma_reserve and the codes using it.

Link: https://lkml.kernel.org/r/20240325145646.1044760-3-bhe@redhat.com
Signed-off-by: Baoquan He <bhe@redhat.com>
Reviewed-by: Mike Rapoport (IBM) <rppt@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baoquan He 2024-03-25 22:56:42 +08:00 committed by Andrew Morton
parent fdb022f6e9
commit 6600a6b10c
2 changed files with 0 additions and 24 deletions
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1
include/linux/mm.h
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@ -3250,7 +3250,6 @@ static inline int early_pfn_to_nid(unsigned long pfn)
extern int __meminit early_pfn_to_nid(unsigned long pfn);
#endif
extern void set_dma_reserve(unsigned long new_dma_reserve);
extern void mem_init(void);
extern void __init mmap_init(void);

23
mm/mm_init.c
View File

@ -227,7 +227,6 @@ static unsigned long required_movablecore_percent __initdata;
static unsigned long nr_kernel_pages __initdata;
static unsigned long nr_all_pages __initdata;
static unsigned long dma_reserve __initdata;
static bool deferred_struct_pages __meminitdata;
@ -1584,12 +1583,6 @@ static void __init free_area_init_core(struct pglist_data *pgdat)
zone_names[j], memmap_pages, freesize);
}
/* Account for reserved pages */
if (j == 0 && freesize > dma_reserve) {
freesize -= dma_reserve;
pr_debug(" %s zone: %lu pages reserved\n", zone_names[0], dma_reserve);
}
if (!is_highmem_idx(j))
nr_kernel_pages += freesize;
/* Charge for highmem memmap if there are enough kernel pages */
@ -2548,22 +2541,6 @@ void *__init alloc_large_system_hash(const char *tablename,
return table;
}
/**
* set_dma_reserve - set the specified number of pages reserved in the first zone
* @new_dma_reserve: The number of pages to mark reserved
*
* The per-cpu batchsize and zone watermarks are determined by managed_pages.
* In the DMA zone, a significant percentage may be consumed by kernel image
* and other unfreeable allocations which can skew the watermarks badly. This
* function may optionally be used to account for unfreeable pages in the
* first zone (e.g., ZONE_DMA). The effect will be lower watermarks and
* smaller per-cpu batchsize.
*/
void __init set_dma_reserve(unsigned long new_dma_reserve)
{
dma_reserve = new_dma_reserve;
}
void __init memblock_free_pages(struct page *page, unsigned long pfn,
unsigned int order)
{