| Message ID | 20231202111430.18059-6-fancer.lancer@gmail.com (mailing list archive) |
|---|---|
| State | Accepted |
| Commit | e540b8c5da04c66ff610d3bf84a7566d9f6bffcf |
| Headers | show |
| Series | MIPS: mm: Fix some memory-related issues | expand |
diff --git a/arch/mips/mm/ioremap.c b/arch/mips/mm/ioremap.c index b6dad2fd5575..d8243d61ef32 100644 --- a/arch/mips/mm/ioremap.c +++ b/arch/mips/mm/ioremap.c @@ -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.
Recent commit a5f616483110 ("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> --- arch/mips/mm/ioremap.c | 4 ++++ 1 file changed, 4 insertions(+)