From 4b40c1c092a932b5b5ab8154235080f02ae19a34 Mon Sep 17 00:00:00 2001 From: Julien Beraud Date: Wed, 5 Apr 2017 15:03:44 +0800 Subject: nios2: implement flush_dcache_mmap_lock/unlock Use spin_lock/unlock_irq instead of doing nothing. This fixes corruptions of the vma_interval_tree causing the kernel to be stuck in an infinite loop in vma_interval_tree_foreach. Signed-off-by: Julien Beraud Acked-by: Ley Foon Tan --- arch/nios2/include/asm/cacheflush.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/nios2/include/asm/cacheflush.h b/arch/nios2/include/asm/cacheflush.h index 52abba973dc2..55e383c173f7 100644 --- a/arch/nios2/include/asm/cacheflush.h +++ b/arch/nios2/include/asm/cacheflush.h @@ -46,7 +46,9 @@ extern void copy_from_user_page(struct vm_area_struct *vma, struct page *page, extern void flush_dcache_range(unsigned long start, unsigned long end); extern void invalidate_dcache_range(unsigned long start, unsigned long end); -#define flush_dcache_mmap_lock(mapping) do { } while (0) -#define flush_dcache_mmap_unlock(mapping) do { } while (0) +#define flush_dcache_mmap_lock(mapping) \ + spin_lock_irq(&(mapping)->tree_lock) +#define flush_dcache_mmap_unlock(mapping) \ + spin_unlock_irq(&(mapping)->tree_lock) #endif /* _ASM_NIOS2_CACHEFLUSH_H */ -- cgit v1.2.3