Thomas Gleixner 12f8d6e7f2 x86/fpu: Return proper error codes from user access functions ... [ Upstream commit aee8c67a4faa40a8df4e79316dbfc92d123989c1 ] When *RSTOR from user memory raises an exception, there is no way to differentiate them. That's bad because it forces the slow path even when the failure was not a fault. If the operation raised eg. #GP then going through the slow path is pointless. Use _ASM_EXTABLE_FAULT() which stores the trap number and let the exception fixup return the negated trap number as error. This allows to separate the fast path and let it handle faults directly and avoid the slow path for all other exceptions. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121457.601480369@linutronix.de Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-07-20 16:10:47 +02:00
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asm	x86/fpu: Return proper error codes from user access functions	2021-07-20 16:10:47 +02:00
uapi/asm	x86/syscalls: Revert "x86/syscalls: Make __X32_SYSCALL_BIT be unsigned long"	2020-06-03 08:21:29 +02:00