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Commit 72aa6517 authored by Hari Bathini's avatar Hari Bathini Committed by Michael Ellerman
Browse files

powerpc/fadump: use helper functions to reserve/release cpu notes buffer 



Use helper functions to simplify memory allocation, pinning down and
freeing the memory used for CPU notes buffer.

Signed-off-by: default avatarHari Bathini <hbathini@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821323555.5656.2486038022572739622.stgit@hbathini.in.ibm.com
parent 8468d155

arch/powerpc/kernel/fadump.c

+6 −15
Original line number Diff line number Diff line
@@ -786,33 +786,24 @@ void fadump_update_elfcore_header(char *bufp) 


static void *fadump_alloc_buffer(unsigned long size)

{

	void *vaddr;

	unsigned long count, i;

	struct page *page;

	unsigned long order, count, i;

	void *vaddr;



	order = get_order(size);

	vaddr = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, order);

	vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);

	if (!vaddr)

		return NULL;



	count = 1 << order;

	count = PAGE_ALIGN(size) / PAGE_SIZE;

	page = virt_to_page(vaddr);

	for (i = 0; i < count; i++)

		SetPageReserved(page + i);

		mark_page_reserved(page + i);

	return vaddr;

}



static void fadump_free_buffer(unsigned long vaddr, unsigned long size)

{

	struct page *page;

	unsigned long order, count, i;



	order = get_order(size);

	count = 1 << order;

	page = virt_to_page(vaddr);

	for (i = 0; i < count; i++)

		ClearPageReserved(page + i);

	__free_pages(page, order);

	free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL);

}



s32 fadump_setup_cpu_notes_buf(u32 num_cpus)