![Masahiro Yamada](/assets/img/avatar_default.png)
The use of config_enabled() against config options is ambiguous. In practical terms, config_enabled() is equivalent to IS_BUILTIN(), but the author might have used it for the meaning of IS_ENABLED(). Using IS_ENABLED(), IS_BUILTIN(), IS_MODULE() etc. makes the intention clearer. This commit replaces config_enabled() with IS_ENABLED() where possible. This commit is only touching bool config options. I noticed two cases where config_enabled() is used against a tristate option: - config_enabled(CONFIG_HWMON) [ drivers/net/wireless/ath/ath10k/thermal.c ] - config_enabled(CONFIG_BACKLIGHT_CLASS_DEVICE) [ drivers/gpu/drm/gma500/opregion.c ] I did not touch them because they should be converted to IS_BUILTIN() in order to keep the logic, but I was not sure it was the authors' intention. Link: http://lkml.kernel.org/r/1465215656-20569-1-git-send-email-yamada.masahiro@socionext.com Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Acked-by: Kees Cook <keescook@chromium.org> Cc: Stas Sergeev <stsp@list.ru> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Joshua Kinard <kumba@gentoo.org> Cc: Jiri Slaby <jslaby@suse.com> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Borislav Petkov <bp@suse.de> Cc: Markos Chandras <markos.chandras@imgtec.com> Cc: "Dmitry V. Levin" <ldv@altlinux.org> Cc: yu-cheng yu <yu-cheng.yu@intel.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Will Drewry <wad@chromium.org> Cc: Nikolay Martynov <mar.kolya@gmail.com> Cc: Huacai Chen <chenhc@lemote.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com> Cc: Rafal Milecki <zajec5@gmail.com> Cc: James Cowgill <James.Cowgill@imgtec.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Alex Smith <alex.smith@imgtec.com> Cc: Adam Buchbinder <adam.buchbinder@gmail.com> Cc: Qais Yousef <qais.yousef@imgtec.com> Cc: Jiang Liu <jiang.liu@linux.intel.com> Cc: Mikko Rapeli <mikko.rapeli@iki.fi> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Cc: "Luis R. Rodriguez" <mcgrof@do-not-panic.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Ingo Molnar <mingo@redhat.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Roland McGrath <roland@hack.frob.com> Cc: Paul Burton <paul.burton@imgtec.com> Cc: Kalle Valo <kvalo@qca.qualcomm.com> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Tony Wu <tung7970@gmail.com> Cc: Huaitong Han <huaitong.han@intel.com> Cc: Sumit Semwal <sumit.semwal@linaro.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Juergen Gross <jgross@suse.com> Cc: Jason Cooper <jason@lakedaemon.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrea Gelmini <andrea.gelmini@gelma.net> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Rabin Vincent <rabin@rab.in> Cc: "Maciej W. Rozycki" <macro@imgtec.com> Cc: David Daney <david.daney@cavium.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
263 lines
6.7 KiB
C
263 lines
6.7 KiB
C
#ifndef _ASM_X86_MMU_CONTEXT_H
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#define _ASM_X86_MMU_CONTEXT_H
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#include <asm/desc.h>
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#include <linux/atomic.h>
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#include <linux/mm_types.h>
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#include <trace/events/tlb.h>
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#include <asm/pgalloc.h>
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#include <asm/tlbflush.h>
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#include <asm/paravirt.h>
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#include <asm/mpx.h>
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#ifndef CONFIG_PARAVIRT
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static inline void paravirt_activate_mm(struct mm_struct *prev,
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struct mm_struct *next)
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{
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}
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#endif /* !CONFIG_PARAVIRT */
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#ifdef CONFIG_PERF_EVENTS
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extern struct static_key rdpmc_always_available;
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static inline void load_mm_cr4(struct mm_struct *mm)
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{
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if (static_key_false(&rdpmc_always_available) ||
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atomic_read(&mm->context.perf_rdpmc_allowed))
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cr4_set_bits(X86_CR4_PCE);
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else
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cr4_clear_bits(X86_CR4_PCE);
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}
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#else
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static inline void load_mm_cr4(struct mm_struct *mm) {}
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#endif
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#ifdef CONFIG_MODIFY_LDT_SYSCALL
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/*
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* ldt_structs can be allocated, used, and freed, but they are never
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* modified while live.
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*/
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struct ldt_struct {
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/*
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* Xen requires page-aligned LDTs with special permissions. This is
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* needed to prevent us from installing evil descriptors such as
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* call gates. On native, we could merge the ldt_struct and LDT
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* allocations, but it's not worth trying to optimize.
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*/
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struct desc_struct *entries;
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int size;
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};
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/*
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* Used for LDT copy/destruction.
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*/
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int init_new_context_ldt(struct task_struct *tsk, struct mm_struct *mm);
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void destroy_context_ldt(struct mm_struct *mm);
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#else /* CONFIG_MODIFY_LDT_SYSCALL */
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static inline int init_new_context_ldt(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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return 0;
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}
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static inline void destroy_context_ldt(struct mm_struct *mm) {}
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#endif
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static inline void load_mm_ldt(struct mm_struct *mm)
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{
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#ifdef CONFIG_MODIFY_LDT_SYSCALL
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struct ldt_struct *ldt;
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/* lockless_dereference synchronizes with smp_store_release */
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ldt = lockless_dereference(mm->context.ldt);
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/*
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* Any change to mm->context.ldt is followed by an IPI to all
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* CPUs with the mm active. The LDT will not be freed until
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* after the IPI is handled by all such CPUs. This means that,
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* if the ldt_struct changes before we return, the values we see
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* will be safe, and the new values will be loaded before we run
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* any user code.
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*
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* NB: don't try to convert this to use RCU without extreme care.
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* We would still need IRQs off, because we don't want to change
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* the local LDT after an IPI loaded a newer value than the one
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* that we can see.
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*/
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if (unlikely(ldt))
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set_ldt(ldt->entries, ldt->size);
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else
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clear_LDT();
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#else
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clear_LDT();
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#endif
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DEBUG_LOCKS_WARN_ON(preemptible());
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}
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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#ifdef CONFIG_SMP
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if (this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
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this_cpu_write(cpu_tlbstate.state, TLBSTATE_LAZY);
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#endif
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}
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static inline int init_new_context(struct task_struct *tsk,
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struct mm_struct *mm)
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{
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init_new_context_ldt(tsk, mm);
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return 0;
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}
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static inline void destroy_context(struct mm_struct *mm)
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{
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destroy_context_ldt(mm);
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}
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extern void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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extern void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk);
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#define switch_mm_irqs_off switch_mm_irqs_off
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#define activate_mm(prev, next) \
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do { \
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paravirt_activate_mm((prev), (next)); \
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switch_mm((prev), (next), NULL); \
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} while (0);
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#ifdef CONFIG_X86_32
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#define deactivate_mm(tsk, mm) \
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do { \
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lazy_load_gs(0); \
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} while (0)
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#else
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#define deactivate_mm(tsk, mm) \
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do { \
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load_gs_index(0); \
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loadsegment(fs, 0); \
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} while (0)
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#endif
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static inline void arch_dup_mmap(struct mm_struct *oldmm,
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struct mm_struct *mm)
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{
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paravirt_arch_dup_mmap(oldmm, mm);
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}
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static inline void arch_exit_mmap(struct mm_struct *mm)
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{
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paravirt_arch_exit_mmap(mm);
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}
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#ifdef CONFIG_X86_64
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static inline bool is_64bit_mm(struct mm_struct *mm)
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{
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return !IS_ENABLED(CONFIG_IA32_EMULATION) ||
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!(mm->context.ia32_compat == TIF_IA32);
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}
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#else
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static inline bool is_64bit_mm(struct mm_struct *mm)
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{
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return false;
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}
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#endif
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static inline void arch_bprm_mm_init(struct mm_struct *mm,
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struct vm_area_struct *vma)
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{
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mpx_mm_init(mm);
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}
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static inline void arch_unmap(struct mm_struct *mm, struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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/*
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* mpx_notify_unmap() goes and reads a rarely-hot
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* cacheline in the mm_struct. That can be expensive
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* enough to be seen in profiles.
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*
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* The mpx_notify_unmap() call and its contents have been
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* observed to affect munmap() performance on hardware
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* where MPX is not present.
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*
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* The unlikely() optimizes for the fast case: no MPX
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* in the CPU, or no MPX use in the process. Even if
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* we get this wrong (in the unlikely event that MPX
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* is widely enabled on some system) the overhead of
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* MPX itself (reading bounds tables) is expected to
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* overwhelm the overhead of getting this unlikely()
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* consistently wrong.
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*/
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if (unlikely(cpu_feature_enabled(X86_FEATURE_MPX)))
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mpx_notify_unmap(mm, vma, start, end);
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}
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static inline int vma_pkey(struct vm_area_struct *vma)
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{
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u16 pkey = 0;
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
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unsigned long vma_pkey_mask = VM_PKEY_BIT0 | VM_PKEY_BIT1 |
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VM_PKEY_BIT2 | VM_PKEY_BIT3;
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pkey = (vma->vm_flags & vma_pkey_mask) >> VM_PKEY_SHIFT;
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#endif
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return pkey;
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}
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static inline bool __pkru_allows_pkey(u16 pkey, bool write)
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{
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u32 pkru = read_pkru();
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if (!__pkru_allows_read(pkru, pkey))
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return false;
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if (write && !__pkru_allows_write(pkru, pkey))
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return false;
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return true;
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}
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/*
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* We only want to enforce protection keys on the current process
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* because we effectively have no access to PKRU for other
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* processes or any way to tell *which * PKRU in a threaded
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* process we could use.
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*
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* So do not enforce things if the VMA is not from the current
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* mm, or if we are in a kernel thread.
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*/
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static inline bool vma_is_foreign(struct vm_area_struct *vma)
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{
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if (!current->mm)
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return true;
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/*
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* Should PKRU be enforced on the access to this VMA? If
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* the VMA is from another process, then PKRU has no
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* relevance and should not be enforced.
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*/
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if (current->mm != vma->vm_mm)
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return true;
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return false;
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}
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static inline bool arch_vma_access_permitted(struct vm_area_struct *vma,
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bool write, bool execute, bool foreign)
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{
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/* pkeys never affect instruction fetches */
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if (execute)
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return true;
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/* allow access if the VMA is not one from this process */
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if (foreign || vma_is_foreign(vma))
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return true;
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return __pkru_allows_pkey(vma_pkey(vma), write);
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}
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static inline bool arch_pte_access_permitted(pte_t pte, bool write)
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{
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return __pkru_allows_pkey(pte_flags_pkey(pte_flags(pte)), write);
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}
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#endif /* _ASM_X86_MMU_CONTEXT_H */
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