diff options
| author |   Stephen Bates <sbates@raithlin.com> | 2017-11-17 15:28:16 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-11-17 16:10:02 -0800 |
| commit | 36a3d1dd4e16bcd0d2ddfb4a2ec7092f0ae0d931 (patch) | |
| tree | 751e5b94e03ed0001a4e0e7bfa9f1f1204f34270 /include/linux/genalloc.h | |
| parent | lib/int_sqrt: adjust comments (diff) | |
| download | linux-dev-36a3d1dd4e16bcd0d2ddfb4a2ec7092f0ae0d931.tar.xz linux-dev-36a3d1dd4e16bcd0d2ddfb4a2ec7092f0ae0d931.zip | |
lib/genalloc.c: make the avail variable an atomic_long_t
If the amount of resources allocated to a gen_pool exceeds 2^32 then the
avail atomic overflows and this causes problems when clients try and
borrow resources from the pool. This is only expected to be an issue on
64 bit systems.
Add the <linux/atomic.h> header to pull in atomic_long* operations. So
that 32 bit systems continue to use atomic32_t but 64 bit systems can
use atomic64_t.
Link: http://lkml.kernel.org/r/1509033843-25667-1-git-send-email-sbates@raithlin.com
Signed-off-by: Stephen Bates <sbates@raithlin.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Daniel Mentz <danielmentz@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/genalloc.h')
| -rw-r--r-- | include/linux/genalloc.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h index 6dfec4d638df..872f930f1b06 100644 --- a/include/linux/genalloc.h +++ b/include/linux/genalloc.h @@ -32,6 +32,7 @@ #include <linux/types.h> #include <linux/spinlock_types.h> +#include <linux/atomic.h> struct device; struct device_node; @@ -71,7 +72,7 @@ struct gen_pool { */ struct gen_pool_chunk { struct list_head next_chunk; /* next chunk in pool */ - atomic_t avail; + atomic_long_t avail; phys_addr_t phys_addr; /* physical starting address of memory chunk */ unsigned long start_addr; /* start address of memory chunk */ unsigned long end_addr; /* end address of memory chunk (inclusive) */ |