lib/vsprintf.c: fix handling of %zd when using ssize_t
Documentation/printk-formats.txt says to use %zd for a ssize_t argument
and some drivers do. Unfortunately this prints a positive number for
negative values eg:
tpm_tis 70030000.tpm_tis: tpm_transmit: tpm_send: error 4294967234
Add a case to va_args a ssize_t type if the interpretation should be
signed.
Tested on PPC32.
Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 39c99fe..41da074 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1485,7 +1485,10 @@
num = va_arg(args, long);
break;
case FORMAT_TYPE_SIZE_T:
- num = va_arg(args, size_t);
+ if (spec.flags & SIGN)
+ num = va_arg(args, ssize_t);
+ else
+ num = va_arg(args, size_t);
break;
case FORMAT_TYPE_PTRDIFF:
num = va_arg(args, ptrdiff_t);