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a9681f745f
[ Upstream commit2835f8bf55] kernel_page_present() was intentionally not implemented when adding ARCH_HAS_SET_DIRECT_MAP support, since it was only used for suspend/resume which is not supported anymore on s390. A new bpf use case led to a compile error specific to s390. Even though this specific use case went away implement kernel_page_present(), so that the API is complete and potential future users won't run into this problem. Reported-by: Daniel Borkmann <daniel@iogearbox.net> Closes: https://lore.kernel.org/all/045de961-ac69-40cc-b141-ab70ec9377ec@iogearbox.net Fixes:0490d6d7ba("s390/mm: enable ARCH_HAS_SET_DIRECT_MAP") Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASMS390_SET_MEMORY_H
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#define _ASMS390_SET_MEMORY_H
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#include <linux/mutex.h>
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extern struct mutex cpa_mutex;
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enum {
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_SET_MEMORY_RO_BIT,
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_SET_MEMORY_RW_BIT,
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_SET_MEMORY_NX_BIT,
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_SET_MEMORY_X_BIT,
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_SET_MEMORY_4K_BIT,
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_SET_MEMORY_INV_BIT,
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_SET_MEMORY_DEF_BIT,
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};
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#define SET_MEMORY_RO BIT(_SET_MEMORY_RO_BIT)
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#define SET_MEMORY_RW BIT(_SET_MEMORY_RW_BIT)
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#define SET_MEMORY_NX BIT(_SET_MEMORY_NX_BIT)
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#define SET_MEMORY_X BIT(_SET_MEMORY_X_BIT)
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#define SET_MEMORY_4K BIT(_SET_MEMORY_4K_BIT)
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#define SET_MEMORY_INV BIT(_SET_MEMORY_INV_BIT)
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#define SET_MEMORY_DEF BIT(_SET_MEMORY_DEF_BIT)
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int __set_memory(unsigned long addr, unsigned long numpages, unsigned long flags);
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#define set_memory_rox set_memory_rox
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/*
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* Generate two variants of each set_memory() function:
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*
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* set_memory_yy(unsigned long addr, int numpages);
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* __set_memory_yy(void *start, void *end);
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*
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* The second variant exists for both convenience to avoid the usual
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* (unsigned long) casts, but unlike the first variant it can also be used
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* for areas larger than 8TB, which may happen at memory initialization.
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*/
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#define __SET_MEMORY_FUNC(fname, flags) \
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static inline int fname(unsigned long addr, int numpages) \
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{ \
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return __set_memory(addr, numpages, (flags)); \
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} \
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\
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static inline int __##fname(void *start, void *end) \
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{ \
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unsigned long numpages; \
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\
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numpages = (end - start) >> PAGE_SHIFT; \
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return __set_memory((unsigned long)start, numpages, (flags)); \
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}
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__SET_MEMORY_FUNC(set_memory_ro, SET_MEMORY_RO)
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__SET_MEMORY_FUNC(set_memory_rw, SET_MEMORY_RW)
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__SET_MEMORY_FUNC(set_memory_nx, SET_MEMORY_NX)
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__SET_MEMORY_FUNC(set_memory_x, SET_MEMORY_X)
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__SET_MEMORY_FUNC(set_memory_rox, SET_MEMORY_RO | SET_MEMORY_X)
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__SET_MEMORY_FUNC(set_memory_rwnx, SET_MEMORY_RW | SET_MEMORY_NX)
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__SET_MEMORY_FUNC(set_memory_4k, SET_MEMORY_4K)
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int set_direct_map_invalid_noflush(struct page *page);
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int set_direct_map_default_noflush(struct page *page);
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bool kernel_page_present(struct page *page);
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#endif
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