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powerpc: fadump: pair alloc_pages_exact() with free_pages_exact()

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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.

Link: https://patch.msgid.link/20260323074836.3653702-3-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
This commit is contained in:
Mike Rapoport (Microsoft) 2026-03-23 09:48:29 +02:00
parent c12c3e1507
commit 25ee3aff99
1 changed files with 2 additions and 14 deletions
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16
arch/powerpc/kernel/fadump.c
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@ -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)