Commit 579ca1a2 authored by Hari Bathini's avatar Hari Bathini Committed by Michael Ellerman
Browse files

powerpc/fadump: make use of memblock's bottom up allocation mode 



Earlier, memblock_find_in_range() was not used to find the memory to
be reserved for FADump as bottom up allocation mode was not supported.
But since commit 79442ed1 ("mm/memblock.c: introduce bottom-up
allocation mode") bottom up allocation mode is supported for memblock.
So, use it to find the memory to be reserved for FADump.

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/156821364211.5656.14336025460336135194.stgit@hbathini.in.ibm.com
parent fbcafdae

arch/powerpc/kernel/fadump.c

+12 −14
Original line number Diff line number Diff line
@@ -342,7 +342,8 @@ static void __init fadump_reserve_crash_area(unsigned long base, 


int __init fadump_reserve_mem(void)

{

	u64 base, size, mem_boundary;

	bool is_memblock_bottom_up = memblock_bottom_up();

	u64 base, size, mem_boundary, align = PAGE_SIZE;

	int ret = 1;



	if (!fw_dump.fadump_enabled)
@@ -362,10 +363,11 @@ int __init fadump_reserve_mem(void) 
		fw_dump.boot_memory_size =

			PAGE_ALIGN(fadump_calculate_reserve_size());

#ifdef CONFIG_CMA

		if (!fw_dump.nocma)

		if (!fw_dump.nocma) {

			align = FADUMP_CMA_ALIGNMENT;

			fw_dump.boot_memory_size =

				ALIGN(fw_dump.boot_memory_size,

							FADUMP_CMA_ALIGNMENT);

				ALIGN(fw_dump.boot_memory_size, align);

		}

#endif

	}
@@ -419,19 +421,15 @@ int __init fadump_reserve_mem(void) 
	} else {

		/*

		 * Reserve memory at an offset closer to bottom of the RAM to

		 * minimize the impact of memory hot-remove operation. We can't

		 * use memblock_find_in_range() here since it doesn't allocate

		 * from bottom to top.

		 * minimize the impact of memory hot-remove operation.

		 */

		while (base <= (mem_boundary - size)) {

			if (memblock_is_region_memory(base, size) &&

			    !memblock_is_region_reserved(base, size))

				break;

		memblock_set_bottom_up(true);

		base = memblock_find_in_range(base, mem_boundary, size, align);



			base += size;

		}

		/* Restore the previous allocation mode */

		memblock_set_bottom_up(is_memblock_bottom_up);



		if (base > (mem_boundary - size)) {

		if (!base) {

			pr_err("Failed to find memory chunk for reservation!\n");

			goto error_out;

		}

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