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Commit 27a3f0e9 authored by Nicolas Pitre's avatar Nicolas Pitre Committed by Nicolas Pitre
Browse files

ARM: sort the meminfo array earlier 



The meminfo array has to be sorted before sanity_check_meminfo() in
arch/arm/mm/mmu.c is called for it to work properly.  This also allows
for a simpler find_limits() in arch/arm/mm/init.c.

The sort is moved to arch/arm/kernel/setup.c because that's where the
meminfo array is populated.  Eventually this should be improved upon
to make the memory bank parser a bit more robust against problems
such as overlapping memory ranges.

Signed-off-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
parent 3e28c800

arch/arm/kernel/setup.c

+8 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/memblock.h>

#include <linux/bug.h>

#include <linux/compiler.h>

#include <linux/sort.h>



#include <asm/unified.h>

#include <asm/cpu.h>
@@ -888,6 +889,12 @@ static struct machine_desc * __init setup_machine_tags(unsigned int nr) 
	return mdesc;

}



static int __init meminfo_cmp(const void *_a, const void *_b)

{

	const struct membank *a = _a, *b = _b;

	long cmp = bank_pfn_start(a) - bank_pfn_start(b);

	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;

}



void __init setup_arch(char **cmdline_p)

{
@@ -916,6 +923,7 @@ void __init setup_arch(char **cmdline_p) 


	parse_early_param();



	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);

	sanity_check_meminfo();

	arm_memblock_init(&meminfo, mdesc);

arch/arm/mm/init.c

+8 −30
Original line number Diff line number Diff line
@@ -20,7 +20,6 @@ 
#include <linux/highmem.h>

#include <linux/gfp.h>

#include <linux/memblock.h>

#include <linux/sort.h>



#include <asm/mach-types.h>

#include <asm/prom.h>
@@ -139,25 +138,13 @@ static void __init find_limits(unsigned long *min, unsigned long *max_low, 
	struct meminfo *mi = &meminfo;

	int i;



	*min = -1UL;

	*max_low = *max_high = 0;



	for_each_bank (i, mi) {

		struct membank *bank = &mi->bank[i];

		unsigned long start, end;



		start = bank_pfn_start(bank);

		end = bank_pfn_end(bank);



		if (*min > start)

			*min = start;

		if (*max_high < end)

			*max_high = end;

		if (bank->highmem)

			continue;

		if (*max_low < end)

			*max_low = end;

	}

	/* This assumes the meminfo array is properly sorted */

	*min = bank_pfn_start(&mi->bank[0]);

	for_each_bank (i, mi)

		if (mi->bank[i].highmem)

				break;

	*max_low = bank_pfn_end(&mi->bank[i - 1]);

	*max_high = bank_pfn_end(&mi->bank[mi->nr_banks - 1]);

}



static void __init arm_bootmem_init(unsigned long start_pfn,
@@ -319,19 +306,10 @@ static void arm_memory_present(void) 
}

#endif



static int __init meminfo_cmp(const void *_a, const void *_b)

{

	const struct membank *a = _a, *b = _b;

	long cmp = bank_pfn_start(a) - bank_pfn_start(b);

	return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;

}



void __init arm_memblock_init(struct meminfo *mi, struct machine_desc *mdesc)

{

	int i;



	sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL);



	memblock_init();

	for (i = 0; i < mi->nr_banks; i++)

		memblock_add(mi->bank[i].start, mi->bank[i].size);