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Driver core fix for 4.20-rc5

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Here is a single driver core fix for 4.20-rc5
 
 It resolves an issue with the data alignment in 'struct devres' for the
 ARC platform.  The full details are in the commit changelog, but the
 short summary is the change is a single line:
 -       unsigned long long              data[]; /* guarantee ull alignment */
 +       u8 __aligned(ARCH_KMALLOC_MINALIGN) data[];
 
 This has been in linux-next for a while with no reported issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-4.20-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core fix from Greg KH:
 "Here is a single driver core fix for 4.20-rc5

  It resolves an issue with the data alignment in 'struct devres' for
  the ARC platform. The full details are in the commit changelog, but
  the short summary is the change is a single line:

	-       unsigned long long              data[]; /* guarantee ull alignment */
	+       u8 __aligned(ARCH_KMALLOC_MINALIGN) data[];

  This has been in linux-next for a while with no reported issues"

* tag 'driver-core-4.20-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  devres: Align data[] to ARCH_KMALLOC_MINALIGN
This commit is contained in:
Linus Torvalds 2018-11-30 12:26:06 -08:00
commit d7aca8a78c
1 changed files with 8 additions and 2 deletions
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10
drivers/base/devres.c
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@ -26,8 +26,14 @@ struct devres_node {
struct devres {
struct devres_node node;
/* -- 3 pointers */
unsigned long long data[]; /* guarantee ull alignment */
/*
* Some archs want to perform DMA into kmalloc caches
* and need a guaranteed alignment larger than
* the alignment of a 64-bit integer.
* Thus we use ARCH_KMALLOC_MINALIGN here and get exactly the same
* buffer alignment as if it was allocated by plain kmalloc().
*/
u8 __aligned(ARCH_KMALLOC_MINALIGN) data[];
};
struct devres_group {