#ifndef __WATCHDOG_PRETIMEOUT_H #define __WATCHDOG_PRETIMEOUT_H #define WATCHDOG_GOV_NAME_MAXLEN 20 struct watchdog_device; struct watchdog_governor { const char name[WATCHDOG_GOV_NAME_MAXLEN]; void (*pretimeout)(struct watchdog_device *wdd); }; #if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_GOV) /* Interfaces to watchdog pretimeout governors */ int watchdog_register_governor(struct watchdog_governor *gov); void watchdog_unregister_governor(struct watchdog_governor *gov); /* Interfaces to watchdog_dev.c */ int watchdog_register_pretimeout(struct watchdog_device *wdd); void watchdog_unregister_pretimeout(struct watchdog_device *wdd); int watchdog_pretimeout_available_governors_get(char *buf); int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf); int watchdog_pretimeout_governor_set(struct watchdog_device *wdd, const char *buf); #if IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_NOOP) #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "noop" #elif IS_ENABLED(CONFIG_WATCHDOG_PRETIMEOUT_DEFAULT_GOV_PANIC) #define WATCHDOG_PRETIMEOUT_DEFAULT_GOV "panic" #endif #else static inline int watchdog_register_pretimeout(struct watchdog_device *wdd) { return 0; } static inline void watchdog_unregister_pretimeout(struct watchdog_device *wdd) { } static inline int watchdog_pretimeout_available_governors_get(char *buf) { return -EINVAL; } static inline int watchdog_pretimeout_governor_get(struct watchdog_device *wdd, char *buf) { return -EINVAL; } static inline int watchdog_pretimeout_governor_set(struct watchdog_device *wdd, const char *buf) { return -EINVAL; } #endif #endif 3a50fbc746ed9b415c25e92'>refslogtreecommitdiff
path: root/fs/xfs/libxfs/xfs_defer.h
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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 /fs/xfs/libxfs/xfs_defer.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 'fs/xfs/libxfs/xfs_defer.h')