diff options
| author | Yosry Ahmed <yosryahmed@google.com> | 2024-03-11 19:43:46 +0000 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-04-25 20:55:49 -0700 |
| commit | 2ccd48ce35e87f09472b42dda96fbf7b5165f3c3 (patch) | |
| tree | 1ccc98877cb2fa3645f95c17faa1610f6bd9ba14 /drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c | |
| parent | mm/numa_balancing: allow migrate on protnone reference with MPOL_PREFERRED_MA... (diff) | |
| download | linux-2ccd48ce35e87f09472b42dda96fbf7b5165f3c3.tar.gz linux-2ccd48ce35e87f09472b42dda96fbf7b5165f3c3.zip | |
percpu: clean up all mappings when pcpu_map_pages() fails
In pcpu_map_pages(), if __pcpu_map_pages() fails on a CPU, we call
__pcpu_unmap_pages() to clean up mappings on all CPUs where mappings were
created, but not on the CPU where __pcpu_map_pages() fails.
__pcpu_map_pages() and __pcpu_unmap_pages() are wrappers around
vmap_pages_range_noflush() and vunmap_range_noflush(). All other callers
of vmap_pages_range_noflush() call vunmap_range_noflush() when mapping
fails, except pcpu_map_pages(). The reason could be that partial mappings
may be left behind from a failed mapping attempt.
Call __pcpu_unmap_pages() for the failed CPU as well in pcpu_map_pages().
This was found by code inspection, no failures or bugs were observed.
Link: https://lkml.kernel.org/r/20240311194346.2291333-1-yosryahmed@google.com
Signed-off-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Dennis Zhou <dennis@kernel.org>
Cc: Christoph Lameter (Ampere) <cl@linux.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c')
0 files changed, 0 insertions, 0 deletions