Commit f0dbd2bd authored by Bartosz Golaszewski's avatar Bartosz Golaszewski Committed by Linus Torvalds
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mm: slab: provide krealloc_array()

When allocating an array of elements, users should check for
multiplication overflow or preferably use one of the provided helpers
like: kmalloc_array().

There's no krealloc_array() counterpart but there are many users who use
regular krealloc() to reallocate arrays.  Let's provide an actual
krealloc_array() implementation.

While at it: add some documentation regarding krealloc.


Signed-off-by: default avatarBartosz Golaszewski <>
Acked-by: default avatarVlastimil Babka <>
Cc: Alexander Shishkin <>
Cc: Andy Shevchenko <>
Cc: Borislav Petkov <>
Cc: Borislav Petkov <>
Cc: Christian Knig <>
Cc: Christoph Lameter <>
Cc: Daniel Vetter <>
Cc: Daniel Vetter <>
Cc: David Airlie <>
Cc: David Rientjes <>
Cc: Gustavo Padovan <>
Cc: James Morse <>
Cc: Jaroslav Kysela <>
Cc: Jason Wang <>
Cc: Joonsoo Kim <>
Cc: Linus Walleij <>
Cc: Maarten Lankhorst <>
Cc: Mauro Carvalho Chehab <>
Cc: Maxime Ripard <>
Cc: "Michael S . Tsirkin" <>
Cc: Pekka Enberg <>
Cc: Robert Richter <>
Cc: Sumit Semwal <>
Cc: Takashi Iwai <>
Cc: Takashi Iwai <>
Cc: Thomas Zimmermann <>
Cc: Tony Luck <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 15d5de49
......@@ -147,6 +147,10 @@ The address of a chunk allocated with `kmalloc` is aligned to at least
ARCH_KMALLOC_MINALIGN bytes. For sizes which are a power of two, the
alignment is also guaranteed to be at least the respective size.
Chunks allocated with kmalloc() can be resized with krealloc(). Similarly
to kmalloc_array(): a helper for resizing arrays is provided in the form of
For large allocations you can use vmalloc() and vzalloc(), or directly
request pages from the page allocator. The memory allocated by `vmalloc`
and related functions is not physically contiguous.
......@@ -592,6 +592,24 @@ static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
return __kmalloc(bytes, flags);
* krealloc_array - reallocate memory for an array.
* @p: pointer to the memory chunk to reallocate
* @new_n: new number of elements to alloc
* @new_size: new size of a single member of the array
* @flags: the type of memory to allocate (see kmalloc)
static __must_check inline void *
krealloc_array(void *p, size_t new_n, size_t new_size, gfp_t flags)
size_t bytes;
if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
return NULL;
return krealloc(p, bytes, flags);
* kcalloc - allocate memory for an array. The memory is set to zero.
* @n: number of elements.
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