From: "Mike Rapoport (Microsoft)" <[email protected]> fadump allocates buffers with alloc_pages_exact(), but then marks them as reserved and frees using free_reserved_area().
This is completely unnecessary and the pages allocated with alloc_pages_exact() can be naturally freed with free_pages_exact(). Replace freeing of memory in fadump_free_buffer() with free_pages_exact() and simplify allocation code so that it won't mark allocated pages as reserved. Signed-off-by: Mike Rapoport (Microsoft) <[email protected]> --- arch/powerpc/kernel/fadump.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index 4ebc333dd786..501d43bf18f3 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -775,24 +775,12 @@ void __init fadump_update_elfcore_header(char *bufp) static void *__init fadump_alloc_buffer(unsigned long size) { - unsigned long count, i; - struct page *page; - void *vaddr; - - vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); - if (!vaddr) - return NULL; - - count = PAGE_ALIGN(size) / PAGE_SIZE; - page = virt_to_page(vaddr); - for (i = 0; i < count; i++) - mark_page_reserved(page + i); - return vaddr; + return alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO); } static void fadump_free_buffer(unsigned long vaddr, unsigned long size) { - free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL); + free_pages_exact((void *)vaddr, size); } s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus) -- 2.53.0
