There are several files that:
#include "linux/file" not #include <linux/file>
#include "asm/file" not #include <asm/file>
Here's a little script that converts them:
egrep -i -r -l --include=*.[ch] \
"^[[:space:]]*\#[[:space:]]*include[[:space:]]*\"(linux|asm)/(.*)\"" * \
| xargs sed -i -e 's/^[[:space:]]*#[[:space:]]*include[[:space:]]*"\(linux\|asm\)\/\(.*\)"/#include <\1\/\2>/g'
Maybe a similar check could be added to checkpatch.pl
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