4d1755b6a7
In addition to the set_memory_xx() functions which allows to change the memory attributes of not (yet) used memory regions, implement a set_memory_attr() function to: - set the final memory protection after init on currently used kernel regions. - enable/disable kernel memory regions in the scope of DEBUG_PAGEALLOC. Unlike the set_memory_xx() which can act in three step as the regions are unused, this function must modify 'on the fly' as the kernel is executing from them. At the moment only PPC32 will use it and changing page attributes on the fly is not an issue. Reported-by: kbuild test robot <lkp@intel.com> [ruscur: cast "data" to unsigned long instead of int] Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210609013431.9805-9-jniethe5@gmail.com
34 lines
872 B
C
34 lines
872 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_SET_MEMORY_H
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#define _ASM_POWERPC_SET_MEMORY_H
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#define SET_MEMORY_RO 0
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#define SET_MEMORY_RW 1
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#define SET_MEMORY_NX 2
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#define SET_MEMORY_X 3
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int change_memory_attr(unsigned long addr, int numpages, long action);
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static inline int set_memory_ro(unsigned long addr, int numpages)
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{
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return change_memory_attr(addr, numpages, SET_MEMORY_RO);
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}
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static inline int set_memory_rw(unsigned long addr, int numpages)
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{
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return change_memory_attr(addr, numpages, SET_MEMORY_RW);
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}
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static inline int set_memory_nx(unsigned long addr, int numpages)
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{
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return change_memory_attr(addr, numpages, SET_MEMORY_NX);
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}
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static inline int set_memory_x(unsigned long addr, int numpages)
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{
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return change_memory_attr(addr, numpages, SET_MEMORY_X);
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}
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int set_memory_attr(unsigned long addr, int numpages, pgprot_t prot);
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#endif
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