commit a510b616131f85215ba156ed67e5ed1c0701f80f upstream.
kernel test robot reported a 5.4.y build issue found by randconfig [1]
after backporting commit 89b158635ad7 ("lib/lz4: explicitly support
in-place decompression""). This isn't a problem for v5.10+ since
commit a510b616131f ("MIPS: Add support for ZSTD-compressed kernels")
which wasn't included in v5.4, but included in v5.10.y, so only v5.4.y
is effected.
This partially cherry-picks the memmove part of commit a510b616131f
to fix the reported build issue for v5.4.y stable only. Hopefully
kernelci could also double check this.
[1] https://lore.kernel.org/r/202107070120.6dOj1kB7-lkp@xxxxxxxxx/
Fixes: defcc2b5e54a ("lib/lz4: explicitly support in-place decompression") # 5.4.y
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
---
not sure if the stable-only patch format is like this, it partially
cherry-picks the useful memmove part of commit a510b616131f to fix
the build issue found by randconfig fuzz only.
arch/mips/boot/compressed/string.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/mips/boot/compressed/string.c b/arch/mips/boot/compressed/string.c
index 43beecc3587c..e9ab7ea592ba 100644
--- a/arch/mips/boot/compressed/string.c
+++ b/arch/mips/boot/compressed/string.c
@@ -27,3 +27,19 @@ void *memset(void *s, int c, size_t n)
ss[i] = c;
return s;
}
+
+void * __weak memmove(void *dest, const void *src, size_t n)
+{
+ unsigned int i;
+ const char *s = src;
+ char *d = dest;
+
+ if ((uintptr_t)dest < (uintptr_t)src) {
+ for (i = 0; i < n; i++)
+ d[i] = s[i];
+ } else {
+ for (i = n; i > 0; i--)
+ d[i - 1] = s[i - 1];
+ }
+ return dest;
+}
--
2.24.4
