Commit-ID: 9cb6ce823bbd1adbe15e30bd1435c84c2e271767 Gitweb: http://git.kernel.org/tip/9cb6ce823bbd1adbe15e30bd1435c84c2e271767 Author: Oleg Nesterov <oleg@xxxxxxxxxx> AuthorDate: Wed, 11 Mar 2015 18:34:49 +0100 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Mon, 23 Mar 2015 10:13:58 +0100 x86/fpu: Use restore_init_xstate() instead of math_state_restore() on kthread exec 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@xxxxxxxxxx> Signed-off-by: Borislav Petkov <bp@xxxxxxx> Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx> Cc: Dave Hansen <dave.hansen@xxxxxxxxx> Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Pekka Riikonen <priikone@xxxxxx> Cc: Quentin Casasnovas <quentin.casasnovas@xxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Suresh Siddha <sbsiddha@xxxxxxxxx> Link: http://lkml.kernel.org/r/20150311173449.GE5032@xxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/kernel/process.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index dcaf4b0..6b05829 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -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(); } } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
|