From: Su Hui suhui@nfschina.com
stable inclusion from stable-v6.6.7 commit 1cdc934c82bbd45cf81a9ce58704fa23156f8ff3 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
commit 73424d00dc63ba681856e06cfb0a5abbdb62e2b5 upstream.
Clang static checker complains that value stored to 'from' is never read. And memcpy_from_folio() only copy the last chunk memory from folio to destination. Use 'to += chunk' to replace 'from += chunk' to fix this typo problem.
Link: https://lkml.kernel.org/r/20231130034017.1210429-1-suhui@nfschina.com Fixes: b23d03ef7af5 ("highmem: add memcpy_to_folio() and memcpy_from_folio()") Signed-off-by: Su Hui suhui@nfschina.com Reviewed-by: Matthew Wilcox (Oracle) willy@infradead.org Cc: Ira Weiny ira.weiny@intel.com Cc: Jiaqi Yan jiaqiyan@google.com Cc: Nathan Chancellor nathan@kernel.org Cc: Nick Desaulniers ndesaulniers@google.com Cc: Peter Collingbourne pcc@google.com Cc: Tom Rix trix@redhat.com Cc: Tony Luck tony.luck@intel.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- include/linux/highmem.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/highmem.h b/include/linux/highmem.h index c1a0d23c61ea..254e1f69a6f5 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -462,7 +462,7 @@ static inline void memcpy_from_folio(char *to, struct folio *folio, memcpy(to, from, chunk); kunmap_local(from);
- from += chunk; + to += chunk; offset += chunk; len -= chunk; } while (len > 0);