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| author | Mike Rapoport <rppt@linux.ibm.com> | 2021-07-01 04:51:19 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-01 06:47:29 +0300 |
| commit | 873ba463914cf484371cba06959d320f9d3121ca (patch) | |
| tree | b16e115378889da0a7ed80e8a67073abe2acc05c /arch/arm64/mm/init.c | |
| parent | 9092d4f7a1f846bcc72e9aace4ed64ed3fc4aa32 (diff) | |
| download | linux-873ba463914cf484371cba06959d320f9d3121ca.tar.xz | |
arm64: decouple check whether pfn is in linear map from pfn_valid()
The intended semantics of pfn_valid() is to verify whether there is a
struct page for the pfn in question and nothing else.
Yet, on arm64 it is used to distinguish memory areas that are mapped in
the linear map vs those that require ioremap() to access them.
Introduce a dedicated pfn_is_map_memory() wrapper for
memblock_is_map_memory() to perform such check and use it where
appropriate.
Using a wrapper allows to avoid cyclic include dependencies.
While here also update style of pfn_valid() so that both pfn_valid() and
pfn_is_map_memory() declarations will be consistent.
Link: https://lkml.kernel.org/r/20210511100550.28178-4-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/arm64/mm/init.c')
| -rw-r--r-- | arch/arm64/mm/init.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index e55409caaee3..148e752a70f7 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -256,6 +256,18 @@ int pfn_valid(unsigned long pfn) } EXPORT_SYMBOL(pfn_valid); +int pfn_is_map_memory(unsigned long pfn) +{ + phys_addr_t addr = PFN_PHYS(pfn); + + /* avoid false positives for bogus PFNs, see comment in pfn_valid() */ + if (PHYS_PFN(addr) != pfn) + return 0; + + return memblock_is_map_memory(addr); +} +EXPORT_SYMBOL(pfn_is_map_memory); + static phys_addr_t memory_limit = PHYS_ADDR_MAX; /* |