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mm: make generic arch_is_kernel_initmem_freed() do what it says
Commit 7a5da02de8
("locking/lockdep: check for freed initmem in
static_obj()") added arch_is_kernel_initmem_freed() which is supposed to
report whether an object is part of already freed init memory.
For the time being, the generic version of
arch_is_kernel_initmem_freed() always reports 'false', allthough
free_initmem() is generically called on all architectures.
Therefore, change the generic version of arch_is_kernel_initmem_freed()
to check whether free_initmem() has been called. If so, then check if a
given address falls into init memory.
To ease the use of system_state, move it out of line into its only
caller which is lockdep.c
Link: https://lkml.kernel.org/r/1d40783e676e07858be97d881f449ee7ea8adfb1.1633001016.git.christophe.leroy@csgroup.eu
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
d2635f2012
commit
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@ -80,20 +80,6 @@ static inline int arch_is_kernel_data(unsigned long addr)
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}
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#endif
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/*
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* Check if an address is part of freed initmem. This is needed on architectures
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* with virt == phys kernel mapping, for code that wants to check if an address
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* is part of a static object within [_stext, _end]. After initmem is freed,
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* memory can be allocated from it, and such allocations would then have
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* addresses within the range [_stext, _end].
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*/
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#ifndef arch_is_kernel_initmem_freed
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static inline int arch_is_kernel_initmem_freed(unsigned long addr)
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{
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return 0;
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}
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#endif
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/**
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* memory_contains - checks if an object is contained within a memory region
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* @begin: virtual address of the beginning of the memory region
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@ -788,6 +788,21 @@ static int very_verbose(struct lock_class *class)
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* Is this the address of a static object:
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*/
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#ifdef __KERNEL__
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/*
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* Check if an address is part of freed initmem. After initmem is freed,
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* memory can be allocated from it, and such allocations would then have
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* addresses within the range [_stext, _end].
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*/
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#ifndef arch_is_kernel_initmem_freed
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static int arch_is_kernel_initmem_freed(unsigned long addr)
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{
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if (system_state < SYSTEM_FREEING_INITMEM)
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return 0;
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return init_section_contains((void *)addr, 1);
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}
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#endif
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static int static_obj(const void *obj)
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{
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unsigned long start = (unsigned long) &_stext,
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