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powerpc: Fix __get_user_pages_fast() irq handling
__get_user_pages_fast() may be called with interrupts disabled (see e.g. get_futex_key() in kernel/futex.c) and therefore should use local_irq_save() and local_irq_restore() instead of local_irq_disable()/enable(). Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> CC: <stable@vger.kernel.org> [v3.12] Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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0b5381a618
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1 changed files with 3 additions and 2 deletions
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@ -123,6 +123,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
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struct mm_struct *mm = current->mm;
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unsigned long addr, len, end;
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unsigned long next;
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unsigned long flags;
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pgd_t *pgdp;
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int nr = 0;
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@ -156,7 +157,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
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* So long as we atomically load page table pointers versus teardown,
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* we can follow the address down to the the page and take a ref on it.
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*/
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local_irq_disable();
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local_irq_save(flags);
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pgdp = pgd_offset(mm, addr);
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do {
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@ -179,7 +180,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
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break;
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} while (pgdp++, addr = next, addr != end);
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local_irq_enable();
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local_irq_restore(flags);
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return nr;
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}
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