The patch titled
Subject: lib/genalloc.c: fix allocation of aligned buffer from non-aligned chunk
has been removed from the -mm tree. Its filename was
lib-genaloc-fix-allocation-of-aligned-buffer-from-non-aligned-chunk.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Alexey Skidanov <alexey.skidanov@xxxxxxxxx>
Subject: lib/genalloc.c: fix allocation of aligned buffer from non-aligned chunk
gen_pool_alloc_algo() uses different allocation functions implementing
different allocation algorithms. With gen_pool_first_fit_align()
allocation function, the returned address should be aligned on the
requested boundary.
If chunk start address isn't aligned on the requested boundary, the
returned address isn't aligned too. The only way to get properly aligned
address is to initialize the pool with chunks aligned on the requested
boundary. If want to have an ability to allocate buffers aligned on
different boundaries (for example, 4K, 1MB, ...), the chunk start address
should be aligned on the max possible alignment.
This happens because gen_pool_first_fit_align() looks for properly aligned
memory block without taking into account the chunk start address
alignment.
To fix this, we provide chunk start address to gen_pool_first_fit_align()
and change its implementation such that it starts looking for properly
aligned block with appropriate offset (exactly as is done in CMA).
Link: https://lkml.kernel.org/lkml/a170cf65-6884-3592-1de9-4c235888cc8a@xxxxxxxxx
Link: http://lkml.kernel.org/r/1541690953-4623-1-git-send-email-alexey.skidanov@xxxxxxxxx
Signed-off-by: Alexey Skidanov <alexey.skidanov@xxxxxxxxx>
Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Logan Gunthorpe <logang@xxxxxxxxxxxx>
Cc: Daniel Mentz <danielmentz@xxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/genalloc.h | 13 +++++++------
lib/genalloc.c | 20 ++++++++++++--------
2 files changed, 19 insertions(+), 14 deletions(-)
--- a/include/linux/genalloc.h~lib-genaloc-fix-allocation-of-aligned-buffer-from-non-aligned-chunk
+++ a/include/linux/genalloc.h
@@ -51,7 +51,8 @@ typedef unsigned long (*genpool_algo_t)(
unsigned long size,
unsigned long start,
unsigned int nr,
- void *data, struct gen_pool *pool);
+ void *data, struct gen_pool *pool,
+ unsigned long start_addr);
/*
* General purpose special memory pool descriptor.
@@ -131,24 +132,24 @@ extern void gen_pool_set_algo(struct gen
extern unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
- struct gen_pool *pool);
+ struct gen_pool *pool, unsigned long start_addr);
extern unsigned long gen_pool_fixed_alloc(unsigned long *map,
unsigned long size, unsigned long start, unsigned int nr,
- void *data, struct gen_pool *pool);
+ void *data, struct gen_pool *pool, unsigned long start_addr);
extern unsigned long gen_pool_first_fit_align(unsigned long *map,
unsigned long size, unsigned long start, unsigned int nr,
- void *data, struct gen_pool *pool);
+ void *data, struct gen_pool *pool, unsigned long start_addr);
extern unsigned long gen_pool_first_fit_order_align(unsigned long *map,
unsigned long size, unsigned long start, unsigned int nr,
- void *data, struct gen_pool *pool);
+ void *data, struct gen_pool *pool, unsigned long start_addr);
extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
- struct gen_pool *pool);
+ struct gen_pool *pool, unsigned long start_addr);
extern struct gen_pool *devm_gen_pool_create(struct device *dev,
--- a/lib/genalloc.c~lib-genaloc-fix-allocation-of-aligned-buffer-from-non-aligned-chunk
+++ a/lib/genalloc.c
@@ -311,7 +311,7 @@ unsigned long gen_pool_alloc_algo(struct
end_bit = chunk_size(chunk) >> order;
retry:
start_bit = algo(chunk->bits, end_bit, start_bit,
- nbits, data, pool);
+ nbits, data, pool, chunk->start_addr);
if (start_bit >= end_bit)
continue;
remain = bitmap_set_ll(chunk->bits, start_bit, nbits);
@@ -525,7 +525,7 @@ EXPORT_SYMBOL(gen_pool_set_algo);
*/
unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
- struct gen_pool *pool)
+ struct gen_pool *pool, unsigned long start_addr)
{
return bitmap_find_next_zero_area(map, size, start, nr, 0);
}
@@ -543,16 +543,19 @@ EXPORT_SYMBOL(gen_pool_first_fit);
*/
unsigned long gen_pool_first_fit_align(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
- struct gen_pool *pool)
+ struct gen_pool *pool, unsigned long start_addr)
{
struct genpool_data_align *alignment;
- unsigned long align_mask;
+ unsigned long align_mask, align_off;
int order;
alignment = data;
order = pool->min_alloc_order;
align_mask = ((alignment->align + (1UL << order) - 1) >> order) - 1;
- return bitmap_find_next_zero_area(map, size, start, nr, align_mask);
+ align_off = (start_addr & (alignment->align - 1)) >> order;
+
+ return bitmap_find_next_zero_area_off(map, size, start, nr,
+ align_mask, align_off);
}
EXPORT_SYMBOL(gen_pool_first_fit_align);
@@ -567,7 +570,7 @@ EXPORT_SYMBOL(gen_pool_first_fit_align);
*/
unsigned long gen_pool_fixed_alloc(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
- struct gen_pool *pool)
+ struct gen_pool *pool, unsigned long start_addr)
{
struct genpool_data_fixed *fixed_data;
int order;
@@ -601,7 +604,8 @@ EXPORT_SYMBOL(gen_pool_fixed_alloc);
*/
unsigned long gen_pool_first_fit_order_align(unsigned long *map,
unsigned long size, unsigned long start,
- unsigned int nr, void *data, struct gen_pool *pool)
+ unsigned int nr, void *data, struct gen_pool *pool,
+ unsigned long start_addr)
{
unsigned long align_mask = roundup_pow_of_two(nr) - 1;
@@ -624,7 +628,7 @@ EXPORT_SYMBOL(gen_pool_first_fit_order_a
*/
unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
unsigned long start, unsigned int nr, void *data,
- struct gen_pool *pool)
+ struct gen_pool *pool, unsigned long start_addr)
{
unsigned long start_bit = size;
unsigned long len = size + 1;
_
Patches currently in -mm which might be from alexey.skidanov@xxxxxxxxx are
