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| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2026-09-30 15:57:32 +0200 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2026-10-09 17:12:06 +0200 |
| commit | 5e3bc6b44c8853bcc7782eac122c5baf2d02f399 (patch) | |
| tree | 779d0c2e5aca461d48349daf9432008c3fc7469b /kernel/stacktrace.c | |
| parent | 57a57ae077f0f167056fc08f1666678f78e5b147 (diff) | |
| download | linux-next-5e3bc6b44c8853bcc7782eac122c5baf2d02f399.tar.gz linux-next-5e3bc6b44c8853bcc7782eac122c5baf2d02f399.zip | |
dma-direct: Restore arch_dma_alloc() for the DMA_ATTR_NO_KERNEL_MAPPING case
Commit 849facea92fa ("dma-direct: simplify the DMA_ATTR_NO_KERNEL_MAPPING
handling") moved the DMA_ATTR_NO_KERNEL_MAPPING shortcut in
dma_direct_alloc() in front of the arch_dma_alloc() call. Architectures
providing their own DMA coherent allocator (CONFIG_ARCH_HAS_DMA_ALLOC)
therefore no longer see such requests. ARM 32bit is one of such. Lack of
the call to arch_dma_alloc() results in the lack of proper cache
management on HighMem pages.
Take the dma-direct shortcut only for coherent devices or when the
architecture doesn't provide arch_dma_alloc(). While touching this,
move that check into separate function to avoid duplication in alloc
and free paths.
Fixes: 849facea92fa ("dma-direct: simplify the DMA_ATTR_NO_KERNEL_MAPPING handling")
Reported-by: Aneesh Kumar K.V <aneesh.kumar@kernel.org>
Closes: https://lore.kernel.org/all/yq5ams2akznl.fsf@kernel.org/
Assisted-by: Claude Opus 5.5 <noreply@anthropic.com>
Link: https://lore.kernel.org/r/20260930135734.1013905-1-m.szyprowski@samsung.com
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'kernel/stacktrace.c')
0 files changed, 0 insertions, 0 deletions