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um: adjust current_thread_info() for newer gcc versions
In some cases gcc >= 4.5.2 will optimize away current_thread_info(). To prevent gcc from doing so the stack address has to be obtained via inline asm. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Kirill A. Shutemov <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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1 changed files with 4 additions and 1 deletions
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@ -49,7 +49,10 @@ static inline struct thread_info *current_thread_info(void)
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{
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struct thread_info *ti;
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unsigned long mask = THREAD_SIZE - 1;
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ti = (struct thread_info *) (((unsigned long) &ti) & ~mask);
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void *p;
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asm volatile ("" : "=r" (p) : "0" (&ti));
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ti = (struct thread_info *) (((unsigned long)p) & ~mask);
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return ti;
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}
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