lib/bitmap.c: quiet sparse noise about address space

__bitmap_parse() and __bitmap_parselist() both take a pointer to a kernel
buffer as a parameter and then cast it to a pointer to user buffer for use
in cases when the parameter is_user indicates that the buffer is actually
located in user space.  This casting, and the casts in the callers,
results in sparse noise like the following:

	warning: incorrect type in initializer (different address spaces)
	  expected char const [noderef] <asn:1>*ubuf
	  got char const *buf
	warning: cast removes address space of expression

Since these casts are intentional, use __force to quiet the noise.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/lib/bitmap.c b/lib/bitmap.c
index 2f4412e4d071..0d4a127dd9b3 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -419,7 +419,7 @@ int __bitmap_parse(const char *buf, unsigned int buflen,
 {
         int c, old_c, totaldigits, ndigits, nchunks, nbits;
         u32 chunk;
-        const char __user *ubuf = buf;
+        const char __user __force *ubuf = (const char __user __force *)buf;
 
         bitmap_zero(maskp, nmaskbits);
 
@@ -504,7 +504,9 @@ int bitmap_parse_user(const char __user *ubuf,
 {
         if (!access_ok(VERIFY_READ, ubuf, ulen))
                 return -EFAULT;
-        return __bitmap_parse((const char *)ubuf, ulen, 1, maskp, nmaskbits);
+        return __bitmap_parse((const char __force *)ubuf,
+                                ulen, 1, maskp, nmaskbits);
+
 }
 EXPORT_SYMBOL(bitmap_parse_user);
 
@@ -594,7 +596,7 @@ static int __bitmap_parselist(const char *buf, unsigned int buflen,
 {
         unsigned a, b;
         int c, old_c, totaldigits;
-        const char __user *ubuf = buf;
+        const char __user __force *ubuf = (const char __user __force *)buf;
         int exp_digit, in_range;
 
         totaldigits = c = 0;
@@ -694,7 +696,7 @@ int bitmap_parselist_user(const char __user *ubuf,
 {
         if (!access_ok(VERIFY_READ, ubuf, ulen))
                 return -EFAULT;
-        return __bitmap_parselist((const char *)ubuf,
+        return __bitmap_parselist((const char __force *)ubuf,
                                         ulen, 1, maskp, nmaskbits);
 }
 EXPORT_SYMBOL(bitmap_parselist_user);