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x86/fpu: Use restore_init_xstate() instead of math_state_restore() on kthread exec

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Change flush_thread() to do user_fpu_begin() and restore_init_xstate()
instead of math_state_restore().

Note: "TODO: cleanup this horror" is still valid. We do not need
init_fpu() at all, we only need fpu_alloc() and memset(0). But this
needs other changes, in particular user_fpu_begin() should set
used_math().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pekka Riikonen <priikone@iki.fi>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Suresh Siddha <sbsiddha@gmail.com>
Link: http://lkml.kernel.org/r/20150311173449.GE5032@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2015-03-11 18:34:49 +01:00 committed by Ingo Molnar
parent 8f4d81863b
commit 9cb6ce823b
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kernel/process.c
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@ -143,7 +143,8 @@ void flush_thread(void)
/* kthread execs. TODO: cleanup this horror. */
if (WARN_ON(init_fpu(current)))
force_sig(SIGKILL, current);
math_state_restore();
user_fpu_begin();
restore_init_xstate();
}
}