From patchwork series 423847

Fox Snowpatch · Fox Snowpatch · commit 8882dd2e6267 · 2024-09-13T23:08:34.000Z
https://patchwork.ozlabs.org//project/linuxppc-dev/list/?series=423847
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
@@ -239,8 +239,8 @@ static inline unsigned long _compound_head(const struct page *page)
 {
 	unsigned long head = READ_ONCE(page->compound_head);
 
-	if (unlikely(head & 1))
-		return head - 1;
+	if (unlikely(head & 1UL))
+		return head & ~1UL;
 	return (unsigned long)page_fixed_fake_head(page);
 }
 

Original file line number	Diff line number	Diff line change
`@@ -239,8 +239,8 @@ static inline unsigned long _compound_head(const struct page *page)`
`239`	`239`	`{`
`240`	`240`	`unsigned long head = READ_ONCE(page->compound_head);`
`241`	`241`
`242`		`- if (unlikely(head & 1))`
`243`		`- return head - 1;`
	`242`	`+ if (unlikely(head & 1UL))`
	`243`	`+ return head & ~1UL;`
`244`	`244`	`return (unsigned long)page_fixed_fake_head(page);`
`245`	`245`	`}`
`246`	`246`