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powerpc: Set max_mapnr correctly

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max_mapnr is used by virt_addr_valid() to check if a linear
address is valid.

It must only include lowmem PFNs, like other architectures.

Problem detected on a system with 1G mem (Only 768M are mapped), with
CONFIG_DEBUG_VIRTUAL and CONFIG_TEST_DEBUG_VIRTUAL, it didn't report
virt_to_phys(VMALLOC_START), VMALLOC_START being 0xf1000000.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/77d99037782ac4b3c3b0124fc4ae80ce7b760b05.1634035228.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-10-12 12:40:37 +02:00 committed by Michael Ellerman
parent 29908bbf7b
commit 602946ec2f
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/mm/mem.c
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@ -256,7 +256,7 @@ void __init mem_init(void)
#endif
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
set_max_mapnr(max_pfn);
set_max_mapnr(max_low_pfn);
kasan_late_init();