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Dave Hansen
e6bfb70959
This plumbs a protection key through calc_vm_flag_bits(). We could have done this in calc_vm_prot_bits(), but I did not feel super strongly which way to go. It was pretty arbitrary which one to use. Signed-off-by: Dave Hansen <[email protected]> Reviewed-by: Thomas Gleixner <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Andrew Morton <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Arve Hjønnevåg <[email protected]> Cc: Benjamin Herrenschmidt <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Chen Gang <[email protected]> Cc: Dan Williams <[email protected]> Cc: Dave Chinner <[email protected]> Cc: Dave Hansen <[email protected]> Cc: David Airlie <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: Eric W. Biederman <[email protected]> Cc: Geliang Tang <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Kirill A. Shutemov <[email protected]> Cc: Konstantin Khlebnikov <[email protected]> Cc: Leon Romanovsky <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Masahiro Yamada <[email protected]> Cc: Maxime Coquelin <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Michael Ellerman <[email protected]> Cc: Oleg Nesterov <[email protected]> Cc: Paul Gortmaker <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Riley Andrews <[email protected]> Cc: Vladimir Davydov <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
#ifndef _LINUX_MMAN_H
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#define _LINUX_MMAN_H
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#include <linux/mm.h>
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#include <linux/percpu_counter.h>
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#include <linux/atomic.h>
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#include <uapi/linux/mman.h>
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extern int sysctl_overcommit_memory;
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extern int sysctl_overcommit_ratio;
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extern unsigned long sysctl_overcommit_kbytes;
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extern struct percpu_counter vm_committed_as;
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#ifdef CONFIG_SMP
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extern s32 vm_committed_as_batch;
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#else
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#define vm_committed_as_batch 0
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#endif
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unsigned long vm_memory_committed(void);
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static inline void vm_acct_memory(long pages)
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{
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__percpu_counter_add(&vm_committed_as, pages, vm_committed_as_batch);
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}
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static inline void vm_unacct_memory(long pages)
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{
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vm_acct_memory(-pages);
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}
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/*
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* Allow architectures to handle additional protection bits
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*/
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#ifndef arch_calc_vm_prot_bits
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#define arch_calc_vm_prot_bits(prot, pkey) 0
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#endif
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#ifndef arch_vm_get_page_prot
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#define arch_vm_get_page_prot(vm_flags) __pgprot(0)
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#endif
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#ifndef arch_validate_prot
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/*
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* This is called from mprotect(). PROT_GROWSDOWN and PROT_GROWSUP have
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* already been masked out.
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*
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* Returns true if the prot flags are valid
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*/
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static inline int arch_validate_prot(unsigned long prot)
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{
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return (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM)) == 0;
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}
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#define arch_validate_prot arch_validate_prot
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#endif
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/*
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* Optimisation macro. It is equivalent to:
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* (x & bit1) ? bit2 : 0
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* but this version is faster.
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* ("bit1" and "bit2" must be single bits)
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*/
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#define _calc_vm_trans(x, bit1, bit2) \
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((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
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: ((x) & (bit1)) / ((bit1) / (bit2)))
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/*
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* Combine the mmap "prot" argument into "vm_flags" used internally.
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*/
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static inline unsigned long
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calc_vm_prot_bits(unsigned long prot, unsigned long pkey)
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{
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return _calc_vm_trans(prot, PROT_READ, VM_READ ) |
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_calc_vm_trans(prot, PROT_WRITE, VM_WRITE) |
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_calc_vm_trans(prot, PROT_EXEC, VM_EXEC) |
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arch_calc_vm_prot_bits(prot, pkey);
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}
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/*
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* Combine the mmap "flags" argument into "vm_flags" used internally.
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*/
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static inline unsigned long
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calc_vm_flag_bits(unsigned long flags)
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{
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return _calc_vm_trans(flags, MAP_GROWSDOWN, VM_GROWSDOWN ) |
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_calc_vm_trans(flags, MAP_DENYWRITE, VM_DENYWRITE ) |
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_calc_vm_trans(flags, MAP_LOCKED, VM_LOCKED );
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}
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unsigned long vm_commit_limit(void);
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#endif /* _LINUX_MMAN_H */
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