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nios2: Don't use _end for calculating min_low_pfn

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If there is a initramfs linked into the kernel which will be
freed later on there is free memory somewhere between _etext
and _end, thus using _end for min_low_pfn is not correct.
This may lead to issues in dma_capable when checking
'min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))'
as the address addr might be below min_low_pfn. Picked
find_limits from architecture arm for applying min_low_pfn and
max_low_pfn. Maybe using _etext for min_low_pfn would be
fine too.

Signed-off-by: Andreas Oetken <andreas.oetken@siemens.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
This commit is contained in:
Andreas Oetken 2021-02-19 14:41:50 +08:00 committed by Ley Foon Tan
parent 9abcfcb203
commit 7f7bc20bc4
1 changed files with 12 additions and 9 deletions
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21
arch/nios2/kernel/setup.c
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@ -32,8 +32,6 @@ EXPORT_SYMBOL(memory_start);
unsigned long memory_end;
EXPORT_SYMBOL(memory_end);
unsigned long memory_size;
static struct pt_regs fake_regs = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0,
0};
@ -141,16 +139,22 @@ asmlinkage void __init nios2_boot_init(unsigned r4, unsigned r5, unsigned r6,
parse_early_param();
}
static void __init find_limits(unsigned long *min, unsigned long *max_low,
unsigned long *max_high)
{
*max_low = PFN_DOWN(memblock_get_current_limit());
*min = PFN_UP(memblock_start_of_DRAM());
*max_high = PFN_DOWN(memblock_end_of_DRAM());
}
void __init setup_arch(char **cmdline_p)
{
int dram_start;
console_verbose();
dram_start = memblock_start_of_DRAM();
memory_size = memblock_phys_mem_size();
memory_start = PAGE_ALIGN((unsigned long)__pa(_end));
memory_end = (unsigned long) CONFIG_NIOS2_MEM_BASE + memory_size;
memory_start = memblock_start_of_DRAM();
memory_end = memblock_end_of_DRAM();
init_mm.start_code = (unsigned long) _stext;
init_mm.end_code = (unsigned long) _etext;
@ -161,11 +165,10 @@ void __init setup_arch(char **cmdline_p)
/* Keep a copy of command line */
*cmdline_p = boot_command_line;
min_low_pfn = PFN_UP(memory_start);
max_low_pfn = PFN_DOWN(memory_end);
find_limits(&min_low_pfn, &max_low_pfn, &max_pfn);
max_mapnr = max_low_pfn;
memblock_reserve(dram_start, memory_start - dram_start);
memblock_reserve(__pa_symbol(_stext), _end - _stext);
#ifdef CONFIG_BLK_DEV_INITRD
if (initrd_start) {
memblock_reserve(virt_to_phys((void *)initrd_start),