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pmem: fix BUG() error in pmem.h:48 on X86_32 

After 'commit fc0c202813 ("x86, pmem: use memcpy_mcsafe()
for memcpy_from_pmem()")', probing a PMEM device hits the BUG()
error below on X86_32 kernel.

 kernel BUG at include/linux/pmem.h:48!

memcpy_from_pmem() calls arch_memcpy_from_pmem(), which is
unimplemented since CONFIG_ARCH_HAS_PMEM_API is undefined on
X86_32.

Fix the BUG() error by adding default_memcpy_from_pmem().

Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
This commit is contained in:
Toshi Kani 2016-04-12 18:10:52 -06:00 committed by Ross Zwisler
parent bf16200689
commit cba2e47abc
1 changed files with 16 additions and 6 deletions
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22
include/linux/pmem.h
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@ -72,6 +72,18 @@ static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
}
#endif
static inline bool arch_has_pmem_api(void)
{
return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
}
static inline int default_memcpy_from_pmem(void *dst, void __pmem const *src,
size_t size)
{
memcpy(dst, (void __force *) src, size);
return 0;
}
/*
* memcpy_from_pmem - read from persistent memory with error handling
* @dst: destination buffer
@ -83,12 +95,10 @@ static inline void arch_invalidate_pmem(void __pmem *addr, size_t size)
static inline int memcpy_from_pmem(void *dst, void __pmem const *src,
size_t size)
{
return arch_memcpy_from_pmem(dst, src, size);
}
static inline bool arch_has_pmem_api(void)
{
return IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API);
if (arch_has_pmem_api())
return arch_memcpy_from_pmem(dst, src, size);
else
return default_memcpy_from_pmem(dst, src, size);
}
/**