From: Oleg Nesterov Date: Mon, 19 Jan 2015 18:51:51 +0000 (+0100) Subject: x86/fpu: Always allow FPU in interrupt if use_eager_fpu() X-Git-Tag: omap-for-v4.1/fixes-rc1~189^2~11^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4b2e762e2e53c721458a83d547b222178bb72a34;p=pandora-kernel.git x86/fpu: Always allow FPU in interrupt if use_eager_fpu() The __thread_has_fpu() check in interrupted_kernel_fpu_idle() was needed to prevent the nested kernel_fpu_begin(). Now that we have in_kernel_fpu and !__thread_has_fpu() case in __kernel_fpu_begin() does not depend on use_eager_fpu() (except clts) we can remove it. __thread_has_fpu() can be false even if use_eager_fpu(), but this case does not differ from !use_eager_fpu() case except we should not worry about X86_CR0_TS, __kernel_fpu_begin()/end() will not touch this bit. Note: I think we can kill all irq_fpu_usable() checks except in_kernel_fpu, just we need to record the state of X86_CR0_TS in __kernel_fpu_begin() and conditionalize stts() in __kernel_fpu_end(), but this needs another patch. Signed-off-by: Oleg Nesterov Reviewed-by: Rik van Riel Acked-by: Andy Lutomirski Cc: Linus Torvalds Cc: Suresh Siddha Link: http://lkml.kernel.org/r/20150119185151.GC16427@redhat.com Signed-off-by: Borislav Petkov --- Reading git-diff-tree failed