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MIPS: mm: Add check for highmem before removing memory block

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If a device has less physical memory than the highmem threshold
bootmem_init() doesn't set highstart_pfn. This results in highmem_init()
wrongly disabling the entire memory range if the cpu doesn't support
highmem. Add a check that highstart_pfn is non zero before removing the
highmem block.

Fixes: f171b55f14 ("mips: fix HIGHMEM initialization")
Signed-off-by: Kyle Hendry <kylehendrydev@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Kyle Hendry 2026-06-21 11:47:02 -07:00 committed by Thomas Bogendoerfer
parent a9e0237d2e
commit 6d5fbecd02
1 changed files with 3 additions and 2 deletions
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5
arch/mips/mm/init.c
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@ -426,10 +426,11 @@ static inline void __init highmem_init(void)
unsigned long tmp;
/*
* If CPU cannot support HIGHMEM discard the memory above highstart_pfn
* If CPU cannot support HIGHMEM discard any memory above highstart_pfn
*/
if (cpu_has_dc_aliases) {
memblock_remove(PFN_PHYS(highstart_pfn), -1);
if (highstart_pfn)
memblock_remove(PFN_PHYS(highstart_pfn), -1);
return;
}