Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
powerpc: fadump: pair alloc_pages_exact() with free_pages_exact()
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>
+2
-14
+2
-14
arch/powerpc/kernel/fadump.c
+2
-14
arch/powerpc/kernel/fadump.c
···
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static void *__init fadump_alloc_buffer(unsigned long size)
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{
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unsigned long count, i;
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struct page *page;
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void *vaddr;
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vaddr = alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
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if (!vaddr)
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return NULL;
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count = PAGE_ALIGN(size) / PAGE_SIZE;
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page = virt_to_page(vaddr);
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for (i = 0; i < count; i++)
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mark_page_reserved(page + i);
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return vaddr;
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return alloc_pages_exact(size, GFP_KERNEL | __GFP_ZERO);
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}
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static void fadump_free_buffer(unsigned long vaddr, unsigned long size)
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{
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free_reserved_area((void *)vaddr, (void *)(vaddr + size), -1, NULL);
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free_pages_exact((void *)vaddr, size);
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}
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s32 __init fadump_setup_cpu_notes_buf(u32 num_cpus)