#ifndef _ASM_GENERIC_CPUTIME_JIFFIES_H #define _ASM_GENERIC_CPUTIME_JIFFIES_H typedef unsigned long __nocast cputime_t; #define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new) #define cputime_one_jiffy jiffies_to_cputime(1) #define cputime_to_jiffies(__ct) (__force unsigned long)(__ct) #define jiffies_to_cputime(__hz) (__force cputime_t)(__hz) typedef u64 __nocast cputime64_t; #define cputime64_to_jiffies64(__ct) (__force u64)(__ct) #define jiffies64_to_cputime64(__jif) (__force cputime64_t)(__jif) /* * Convert nanoseconds <-> cputime */ #define cputime_to_nsecs(__ct) \ jiffies_to_nsecs(cputime_to_jiffies(__ct)) #define nsecs_to_cputime64(__nsec) \ jiffies64_to_cputime64(nsecs_to_jiffies64(__nsec)) #define nsecs_to_cputime(__nsec) \ jiffies_to_cputime(nsecs_to_jiffies(__nsec)) /* * Convert cputime to microseconds and back. */ #define cputime_to_usecs(__ct) \ jiffies_to_usecs(cputime_to_jiffies(__ct)) #define usecs_to_cputime(__usec) \ jiffies_to_cputime(usecs_to_jiffies(__usec)) #define usecs_to_cputime64(__usec) \ jiffies64_to_cputime64(nsecs_to_jiffies64((__usec) * 1000)) /* * Convert cputime to seconds and back. */ #define cputime_to_secs(jif) (cputime_to_jiffies(jif) / HZ) #define secs_to_cputime(sec) jiffies_to_cputime((sec) * HZ) /* * Convert cputime to timespec and back. */ #define timespec_to_cputime(__val) \ jiffies_to_cputime(timespec_to_jiffies(__val)) #define cputime_to_timespec(__ct,__val) \ jiffies_to_timespec(cputime_to_jiffies(__ct),__val) /* * Convert cputime to timeval and back. */ #define timeval_to_cputime(__val) \ jiffies_to_cputime(timeval_to_jiffies(__val)) #define cputime_to_timeval(__ct,__val) \ jiffies_to_timeval(cputime_to_jiffies(__ct),__val) /* * Convert cputime to clock and back. */ #define cputime_to_clock_t(__ct) \ jiffies_to_clock_t(cputime_to_jiffies(__ct)) #define clock_t_to_cputime(__x) \ jiffies_to_cputime(clock_t_to_jiffies(__x)) /* * Convert cputime64 to clock. */ #define cputime64_to_clock_t(__ct) \ jiffies_64_to_clock_t(cputime64_to_jiffies64(__ct)) #endif /host/whci/hcd.c?id=c8f325a59cfc718d13a50fbc746ed9b415c25e92'>diff
path: root/drivers/usb/host/whci/hcd.c
diff options
context:
space:
mode:
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 /drivers/usb/host/whci/hcd.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 'drivers/usb/host/whci/hcd.c')