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XArray: Optimise xas_sibling() if !CONFIG_XARRAY_MULTI

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If CONFIG_XARRAY_MULTI is disabled, then xas_sibling() must be false.

Reported-by: JaeJoon Jung <rgbi3307@gmail.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Matthew Wilcox (Oracle)
2020-02-27 07:37:40 -05:00
parent 3a00e7c47c
commit d8e93e3f22
1 changed files with 1 additions and 1 deletions
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2
lib/xarray.c
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@@ -1836,7 +1836,7 @@ static bool xas_sibling(struct xa_state *xas)
struct xa_node *node = xas->xa_node; struct xa_node *node = xas->xa_node;
unsigned long mask; unsigned long mask;
if (!node) if (!IS_ENABLED(CONFIG_XARRAY_MULTI) || !node)
return false; return false;
mask = (XA_CHUNK_SIZE << node->shift) - 1; mask = (XA_CHUNK_SIZE << node->shift) - 1;
return (xas->xa_index & mask) > return (xas->xa_index & mask) >