This is a note to let you know that I've just added the patch titled
cache: ax45mp_cache: Align end size to cache boundary in ax45mp_dma_cache_wback()
to the 6.6-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
cache-ax45mp_cache-align-end-size-to-cache-boundary-.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5b75dab51171962007d5350107674fafede42f96
Author: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Date: Sat Feb 3 21:26:40 2024 +0000
cache: ax45mp_cache: Align end size to cache boundary in ax45mp_dma_cache_wback()
[ Upstream commit 9bd405c48b0ac4de087c0c4440fd79597201b8a7 ]
Align the end size to cache boundary size in ax45mp_dma_cache_wback()
callback likewise done in ax45mp_dma_cache_inv() callback.
Additionally return early in case of start == end.
Fixes: d34599bcd2e4 ("cache: Add L2 cache management for Andes AX45MP RISC-V core")
Reported-by: Pavel Machek <pavel@xxxxxxx>
Link: https://lore.kernel.org/cip-dev/ZYsdKDiw7G+kxQ3m@xxxxxxxxxx/
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/cache/ax45mp_cache.c b/drivers/cache/ax45mp_cache.c
index 57186c58dc849..1d7dd3d2c101c 100644
--- a/drivers/cache/ax45mp_cache.c
+++ b/drivers/cache/ax45mp_cache.c
@@ -129,8 +129,12 @@ static void ax45mp_dma_cache_wback(phys_addr_t paddr, size_t size)
unsigned long line_size;
unsigned long flags;
+ if (unlikely(start == end))
+ return;
+
line_size = ax45mp_priv.ax45mp_cache_line_size;
start = start & (~(line_size - 1));
+ end = ((end + line_size - 1) & (~(line_size - 1)));
local_irq_save(flags);
ax45mp_cpu_dcache_wb_range(start, end);
local_irq_restore(flags);
