+ lib-fix-bitmap_parse-on-64-bit-big-endian-archs.patch added to -mm tree

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: lib: fix bitmap_parse() on 64-bit big endian archs
has been added to the -mm tree.  Its filename is
     lib-fix-bitmap_parse-on-64-bit-big-endian-archs.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/lib-fix-bitmap_parse-on-64-bit-big-endian-archs.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/lib-fix-bitmap_parse-on-64-bit-big-endian-archs.patch

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------------------------------------------------------
From: Alexander Gordeev <agordeev@linux.ibm.com>
Subject: lib: fix bitmap_parse() on 64-bit big endian archs

Commit 2d6261583be0 ("lib: rework bitmap_parse()") does not take into
account order of halfwords on 64-bit big endian architectures.  As result
(at least) Receive Packet Steering, IRQ affinity masks and runtime kernel
test "test_bitmap" get broken on s390.

Link: http://lkml.kernel.org/r/1591634471-17647-1-git-send-email-agordeev@linux.ibm.com
Fixes: 2d6261583be0 ("lib: rework bitmap_parse()")
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Yury Norov <yury.norov@gmail.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Amritha Nambiar <amritha.nambiar@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Kees Cook <keescook@chromium.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: "Tobin C . Harding" <tobin@kernel.org>
Cc: Vineet Gupta <vineet.gupta1@synopsys.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Willem de Bruijn <willemb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/bitmap.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/lib/bitmap.c~lib-fix-bitmap_parse-on-64-bit-big-endian-archs
+++ a/lib/bitmap.c
@@ -740,6 +740,7 @@ int bitmap_parse(const char *start, unsi
 	const char *end = strnchrnul(start, buflen, '\n') - 1;
 	int chunks = BITS_TO_U32(nmaskbits);
 	u32 *bitmap = (u32 *)maskp;
+	int chunk = 0;
 	int unset_bit;
 
 	while (1) {
@@ -750,9 +751,14 @@ int bitmap_parse(const char *start, unsi
 		if (!chunks--)
 			return -EOVERFLOW;
 
-		end = bitmap_get_x32_reverse(start, end, bitmap++);
+#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN)
+		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]);
+#else
+		end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]);
+#endif
 		if (IS_ERR(end))
 			return PTR_ERR(end);
+		chunk++;
 	}
 
 	unset_bit = (BITS_TO_U32(nmaskbits) - chunks) * 32;
_

Patches currently in -mm which might be from agordeev@linux.ibm.com are

lib-fix-bitmap_parse-on-64-bit-big-endian-archs.patch