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-... and later at http://ozlabs.org/~akpm/mmotm/broken-out/lib-fix-bitmap_parse-on-64-bit-big-...

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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.ib... 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