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

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

Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/156821323555.5656.2486038022572739622.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini 2019-09-11 20:17:56 +05:30 committed by Michael Ellerman
parent 8468d15545
commit 72aa651795
1 changed files with 6 additions and 15 deletions
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21
arch/powerpc/kernel/fadump.c
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@ -786,33 +786,24 @@ void fadump_update_elfcore_header(char *bufp)
static void *fadump_alloc_buffer(unsigned long size) static void *fadump_alloc_buffer(unsigned long size)
{ {
void *vaddr; unsigned long count, i;
struct page *page; struct page *page;
unsigned long order, count, i; void *vaddr;
order = get_order(size); vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
vaddr = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
if (!vaddr) if (!vaddr)
return NULL; return NULL;
count = 1 << order; count = PAGE_ALIGN(size) / PAGE_SIZE;
page = virt_to_page(vaddr); page = virt_to_page(vaddr);
for (i = 0; i < count; i++) for (i = 0; i < count; i++)
SetPageReserved(page + i); mark_page_reserved(page + i);
return vaddr; return vaddr;
} }
static void fadump_free_buffer(unsigned long vaddr, unsigned long size) static void fadump_free_buffer(unsigned long vaddr, unsigned long size)
{ {
struct page *page; free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL);
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);
} }
s32 fadump_setup_cpu_notes_buf(u32 num_cpus) s32 fadump_setup_cpu_notes_buf(u32 num_cpus)