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lx_emul: support compound pages

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Issue #5236
This commit is contained in:
Christian Helmuth 2024-05-31 15:45:01 +02:00 committed by Norman Feske
parent 3bd04d1253
commit 193b19fb78
1 changed files with 42 additions and 3 deletions
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45
repos/dde_linux/src/lib/lx_emul/shadow/mm/page_alloc.c
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@ -20,6 +20,34 @@
#include <lx_emul/page_virt.h>
static void prepare_compound_page(struct page *page, unsigned int order, gfp_t gfp)
{
int i;
if (!order || !(gfp & __GFP_COMP))
return;
__SetPageHead(page);
set_compound_order(page, order);
for (i = 1; i < compound_nr(page); i++)
set_compound_head(&page[i], page);
}
static void liquidate_compound_page(struct page *page)
{
int i;
if (!PageHead(page))
return;
for (i = 1; i < compound_nr(page); i++)
clear_compound_head(&page[i]);
ClearPageHead(page);
}
static void lx_free_pages(struct page *page, bool force)
{
void * const virt_addr = page_address(page);
@ -29,6 +57,8 @@ static void lx_free_pages(struct page *page, bool force)
else if (!put_page_testzero(page))
return;
liquidate_compound_page(page);
lx_emul_mem_free(virt_addr);
}
@ -48,7 +78,7 @@ void free_pages(unsigned long addr,unsigned int order)
static struct page * lx_alloc_pages(unsigned const nr_pages)
{
void const *ptr = lx_emul_mem_alloc_aligned(PAGE_SIZE*nr_pages, PAGE_SIZE);
void const *ptr = lx_emul_mem_alloc_aligned(PAGE_SIZE*nr_pages, nr_pages*PAGE_SIZE);
struct page *page = lx_emul_virt_to_page(ptr);
init_page_count(page);
@ -95,17 +125,26 @@ struct page * __alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid,
nodemask_t * nodemask)
#endif
{
return lx_alloc_pages(1u << order);
struct page *page = lx_alloc_pages(1u << order);
if (!page)
return 0;
prepare_compound_page(page, order, gfp);
return page;
}
unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order)
unsigned long __get_free_pages(gfp_t gfp, unsigned int order)
{
struct page *page = lx_alloc_pages(1u << order);
if (!page)
return 0;
prepare_compound_page(page, order, gfp);
return (unsigned long)page_address(page);
}