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mips: mm: add slab availability checking in ioremap_prot

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Recent commit a5f6164831 ("mm/ioremap: add slab availability checking in
ioremap_prot") added the slab availability check to the generic
ioremap_prot() implementation. It is reasonable to be done for the
MIPS32-specific method too since it also relies on the
get_vm_area_caller() function (by means of get_vm_area()) which requires
the slab allocator being up and running before being called.

Signed-off-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Serge Semin 2023-12-02 14:14:22 +03:00 committed by Thomas Bogendoerfer
parent 1c0150229f
commit e540b8c5da
1 changed files with 4 additions and 0 deletions
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4
arch/mips/mm/ioremap.c
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@ -72,6 +72,10 @@ void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
flags == _CACHE_UNCACHED)
return (void __iomem *) CKSEG1ADDR(phys_addr);
/* Early remaps should use the unmapped regions til' VM is available */
if (WARN_ON_ONCE(!slab_is_available()))
return NULL;
/*
* Don't allow anybody to remap RAM that may be allocated by the page
* allocator, since that could lead to races & data clobbering.