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x86, fpu: check __clear_user() return value 

fix warning:

  arch/x86/kernel/xsave.c: In function ‘save_i387_xstate’:
  arch/x86/kernel/xsave.c:98: warning: ignoring return value of ‘__clear_user’, declared with attribute warn_unused_result

check the return value and act on it. We should not be ignoring faults
at this point.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-08-18 12:59:32 +02:00
parent 620f2efcdc
commit 9f482807a6
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kernel/xsave.c
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@ -95,7 +95,9 @@ int save_i387_xstate(void __user *buf)
* Start with clearing the user buffer. This will present a
* clean context for the bytes not touched by the fxsave/xsave.
*/
__clear_user(buf, sig_xstate_size);
err = __clear_user(buf, sig_xstate_size);
if (err)
return err;
if (task_thread_info(tsk)->status & TS_XSAVE)
err = xsave_user(buf);