Dave Martin 9de52a755c arm64: fpsimd: Fix failure to restore FPSIMD state after signals ... The fpsimd_update_current_state() function is responsible for loading the FPSIMD state from the user signal frame into the current task during sigreturn. When implementing support for SVE, conditional code was added to this function in order to handle the case where SVE state need to be loaded for the task and merged with the FPSIMD data from the signal frame; however, the FPSIMD-only case was unintentionally dropped. As a result of this, sigreturn does not currently restore the FPSIMD state of the task, except in the case where the system supports SVE and the signal frame contains SVE state in addition to FPSIMD state. This patch fixes this bug by making the copy-in of the FPSIMD data from the signal frame to thread_struct unconditional. This remains a performance regression from v4.14, since the FPSIMD state is now copied into thread_struct and then loaded back, instead of _only_ being loaded into the CPU FPSIMD registers. However, it is essential to call task_fpsimd_load() here anyway in order to ensure that the SVE enable bit in CPACR_EL1 is set correctly before returning to userspace. This could use some refactoring, but since sigreturn is not a fast path I have kept this patch as a pure fix and left the refactoring for later. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Fixes: 8cd969d28f ("arm64/sve: Signal handling support") Reported-by: Alex Bennée <alex.bennee@linaro.org> Tested-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Signed-off-by: Dave Martin <Dave.Martin@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>		2017-12-01 13:05:05 +00:00
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boot	ARM: Device-tree updates for 4.15	2017-11-16 15:48:26 -08:00
configs	arm64: defconfig: enable CONFIG_GPIO_UNIPHIER	2017-10-30 14:41:54 +01:00
crypto	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
include	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00
kernel	arm64: fpsimd: Fix failure to restore FPSIMD state after signals	2017-12-01 13:05:05 +00:00
kvm	GICv4 Support for KVM/ARM for v4.15	2017-11-17 13:20:01 +01:00
lib	arm64 updates for 4.15	2017-11-15 10:56:56 -08:00
mm	arm64: pgd: Mark pgd_cache as __ro_after_init	2017-12-01 13:05:04 +00:00
net
xen
Kconfig	arm64/mm/kasan: don't use vmemmap_populate() to initialize shadow	2017-11-15 18:21:05 -08:00
Kconfig.debug
Kconfig.platforms	ARM: SoC driver updates for v4.15	2017-11-16 16:05:01 -08:00
Makefile	arm64: ftrace: emit ftrace-mod.o contents through code	2017-12-01 13:04:59 +00:00