[PATCH 3.12 064/127] lib/genalloc.c: start search from start of chunk

From: Jiri Slaby
Date: Fri Nov 25 2016 - 04:01:15 EST

From: Daniel Mentz <danielmentz@xxxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


commit 62e931fac45b17c2a42549389879411572f75804 upstream.

gen_pool_alloc_algo() iterates over the chunks of a pool trying to find
a contiguous block of memory that satisfies the allocation request.

The shortcut

if (size > atomic_read(&chunk->avail))

makes the loop skip over chunks that do not have enough bytes left to
fulfill the request. There are two situations, though, where an
allocation might still fail:

(1) The available memory is not contiguous, i.e. the request cannot
be fulfilled due to external fragmentation.

(2) A race condition. Another thread runs the same code concurrently
and is quicker to grab the available memory.

In those situations, the loop calls pool->algo() to search the entire
chunk, and pool->algo() returns some value that is >= end_bit to
indicate that the search failed. This return value is then assigned to
start_bit. The variables start_bit and end_bit describe the range that
should be searched, and this range should be reset for every chunk that
is searched. Today, the code fails to reset start_bit to 0. As a
result, prefixes of subsequent chunks are ignored. Memory allocations
might fail even though there is plenty of room left in these prefixes of
those other chunks.

Fixes: 7f184275aa30 ("lib, Make gen_pool memory allocator lockless")
Link: http://lkml.kernel.org/r/1477420604-28918-1-git-send-email-danielmentz@xxxxxxxxxx
Signed-off-by: Daniel Mentz <danielmentz@xxxxxxxxxx>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
lib/genalloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/genalloc.c b/lib/genalloc.c
index 26cf20be72b7..17271ef368ca 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -273,7 +273,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
struct gen_pool_chunk *chunk;
unsigned long addr = 0;
int order = pool->min_alloc_order;
- int nbits, start_bit = 0, end_bit, remain;
+ int nbits, start_bit, end_bit, remain;

@@ -288,6 +288,7 @@ unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
if (size > atomic_read(&chunk->avail))

+ start_bit = 0;
end_bit = chunk_size(chunk) >> order;
start_bit = pool->algo(chunk->bits, end_bit, start_bit, nbits,