# # NFC sybsystem configuration # menuconfig NFC depends on NET depends on RFKILL || !RFKILL tristate "NFC subsystem support" default n help Say Y here if you want to build support for NFC (Near field communication) devices. To compile this support as a module, choose M here: the module will be called nfc. config NFC_DIGITAL depends on NFC select CRC_CCITT select CRC_ITU_T tristate "NFC Digital Protocol stack support" default n help Say Y if you want to build NFC digital protocol stack support. This is needed by NFC chipsets whose firmware only implement the NFC analog layer. To compile this support as a module, choose M here: the module will be called nfc_digital. source "net/nfc/nci/Kconfig" source "net/nfc/hci/Kconfig" source "drivers/nfc/Kconfig" ='/cgit.cgi/linux/net-next.git/'>net-next.git
net-next plumbingsTobias Klauser
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dccp/ccids/lib/tfrc_equation.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>c8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/dccp/ccids/lib/tfrc_equation.c
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 'net/dccp/ccids/lib/tfrc_equation.c')