#ifndef LOCKING_H #define LOCKING_H #include #include "built_in.h" struct spinlock { pthread_spinlock_t lock; }; struct mutexlock { pthread_mutex_t lock; }; struct rwlock { pthread_rwlock_t lock; }; static inline int spinlock_init(struct spinlock *l) { return -pthread_spin_init(&l->lock, 0); } static inline void spinlock_destroy(struct spinlock *l) { pthread_spin_destroy(&l->lock); } static inline void spinlock_lock(struct spinlock *l) { pthread_spin_lock(&l->lock); } static inline void spinlock_unlock(struct spinlock *l) { pthread_spin_unlock(&l->lock); } static inline int mutexlock_init(struct mutexlock *l) { return -pthread_mutex_init(&l->lock, 0); } static inline void mutexlock_destroy(struct mutexlock *l) { pthread_mutex_destroy(&l->lock); } static inline void mutexlock_lock(struct mutexlock *l) { pthread_mutex_lock(&l->lock); } static inline void mutexlock_unlock(struct mutexlock *l) { pthread_mutex_unlock(&l->lock); } static inline int rwlock_init(struct rwlock *l) { return -pthread_rwlock_init(&l->lock, 0); } static inline int rwlock_init2(struct rwlock *l, pthread_rwlockattr_t *attr) { return -pthread_rwlock_init(&l->lock, attr); } static inline void rwlock_destroy(struct rwlock *l) { pthread_rwlock_destroy(&l->lock); } static inline void rwlock_rd_lock(struct rwlock *l) { pthread_rwlock_rdlock(&l->lock); } static inline void rwlock_wr_lock(struct rwlock *l) { pthread_rwlock_wrlock(&l->lock); } static inline void rwlock_unlock(struct rwlock *l) { pthread_rwlock_unlock(&l->lock); } #endif /* LOCKING_H */ href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summaryrefslogtreecommitdiff
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /include/math-emu/quad.h
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/math-emu/quad.h')