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<div class="moz-cite-prefix">On 5/28/2025 1:13 AM, Natalie Vock
wrote:<br>
</div>
<blockquote type="cite" cite="mid:20250527194353.8023-2-natalie.vock@gmx.de">
<pre wrap="" class="moz-quote-pre">Cleared blocks that are handed out to users after allocation cannot be
presumed to remain cleared. Thus, allocators using drm_buddy need to
dirty all blocks on the allocation success path. Provide a helper for
them to use.
Fixes: 96950929eb232 ("drm/buddy: Implement tracking clear page feature")
Cc: <a class="moz-txt-link-abbreviated" href="mailto:stable@vger.kernel.org">stable@vger.kernel.org</a>
Signed-off-by: Natalie Vock <a class="moz-txt-link-rfc2396E" href="mailto:natalie.vock@gmx.de"><natalie.vock@gmx.de></a>
---
include/drm/drm_buddy.h | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/include/drm/drm_buddy.h b/include/drm/drm_buddy.h
index 9689a7c5dd36..48628ff1c24f 100644
--- a/include/drm/drm_buddy.h
+++ b/include/drm/drm_buddy.h
@@ -142,6 +142,12 @@ drm_buddy_block_size(struct drm_buddy *mm,
return mm->chunk_size << drm_buddy_block_order(block);
}
+static inline void
+drm_buddy_block_set_dirty(struct drm_buddy_block *block)
+{
+ block->header &= ~DRM_BUDDY_HEADER_CLEAR;</pre>
</blockquote>
<br>
<p style="font-size: 16px" data-pm-slice="1 1 []">The users should
not modify this DRM_BUDDY_HEADER_CLEAR flag directly; instead,
please use the DRM_BUDDY_CLEARED flag in the driver.</p>
<p style="font-size: 16px" data-pm-slice="1 1 []">The buddy manager
will take care of this DRM_BUDDY_HEADER_CLEAR flag.</p>
<blockquote type="cite" cite="mid:20250527194353.8023-2-natalie.vock@gmx.de">
<pre wrap="" class="moz-quote-pre">
+}
+
int drm_buddy_init(struct drm_buddy *mm, u64 size, u64 chunk_size);
void drm_buddy_fini(struct drm_buddy *mm);
</pre>
</blockquote>
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