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| author | Jonathan Neuschäfer <j.neuschaefer@gmx.net> | 2018-03-28 02:25:42 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-04-01 00:47:43 +1100 |
| commit | 2bbf63264ab2e8cbc740c738f66984b2aafa29c5 (patch) | |
| tree | 4610ddecbf8a4af5baed26bff2b2f1ebff4d0e2f /arch/powerpc/mm | |
| parent | f65e67c7e3308c0af08080782d79a8cb95c44929 (diff) | |
| download | linux-2bbf63264ab2e8cbc740c738f66984b2aafa29c5.tar.bz2 | |
powerpc/mm/32: Use page_is_ram to check for RAM
On systems where there is MMIO space between different blocks of RAM in
the physical address space, __ioremap_caller did not allow mapping these
MMIO areas, because they were below the end RAM and thus considered RAM
as well. Use the memblock-based page_is_ram function, which returns
false for such MMIO holes.
v2:
Keep the check for p < virt_to_phys(high_memory). On 32-bit systems
with high memory (memory above physical address 4GiB), the high memory
is expected to be available though ioremap. The high_memory variable
marks the end of low memory; comparing against it means that only
ioremap requests for low RAM will be denied.
Reported by Michael Ellerman.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index d35d9ad3c1cd..6668ecc041ad 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -148,6 +148,7 @@ __ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags, * mem_init() sets high_memory so only do the check after that. */ if (slab_is_available() && (p < virt_to_phys(high_memory)) && + page_is_ram(__phys_to_pfn(p)) && !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) { printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n", (unsigned long long)p, __builtin_return_address(0)); |