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81c4f4d924d5d009b5ed785a3e22b18d0f7b831f is the first bad commit
commit 81c4f4d924d5d009b5ed785a3e22b18d0f7b831f
Author: Alexander Gordeev <agordeev@linux.ibm.com>
Date:   Wed Jun 10 18:41:41 2020 -0700

    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.
    
    [andriy.shevchenko@linux.intel.com: convert infinite while loop to a for loop]
      Link: http://lkml.kernel.org/r/20200609140535.87160-1-andriy.shevchenko@linux.intel.com
    
    Fixes: 2d6261583be0 ("lib: rework bitmap_parse()")
    Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
    Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
    Cc: Yury Norov <yury.norov@gmail.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>
    Link: http://lkml.kernel.org/r/1591634471-17647-1-git-send-email-agordeev@linux.ibm.com
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

:040000 040000 ebf8a78b34b93db2250307596e4ac2cd19aef085 57e9b66c86ac6e164fd4531eefba76d06e3644e3 M	lib

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git revert 81c4f4d924d5d009b5ed785a3e22b18d0f7b831f

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[master 07b4d4ad9701] Revert "lib: fix bitmap_parse() on 64-bit big endian archs"
 1 file changed, 2 insertions(+), 7 deletions(-)

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diff -rupN a/lib/bitmap.c b/lib/bitmap.c
--- a/lib/bitmap.c      2020-06-20 15:04:45.391807914 +0200
+++ b/lib/bitmap.c      2020-06-20 15:01:48.792908877 +0200
@@ -741,9 +741,8 @@ int bitmap_parse(const char *start, unsi
        int chunks = BITS_TO_U32(nmaskbits);
        u32 *bitmap = (u32 *)maskp;
        int unset_bit;
-       int chunk;

-       for (chunk = 0; ; chunk++) {
+       while (1) {
                end = bitmap_find_region_reverse(start, end);
                if (start > end)
                        break;
@@ -751,11 +750,7 @@ int bitmap_parse(const char *start, unsi
                if (!chunks--)
                        return -EOVERFLOW;

-#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
+               end = bitmap_get_x32_reverse(start, end, bitmap++);
                if (IS_ERR(end))
                        return PTR_ERR(end);
        }

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patch -p0 < dpaa-v1.patch

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patching file a/lib/bitmap.c