btrfs-tools: include linux/const.h to fix build with 5.12+ headers

btrfs-tools compile fails with mips, musl and 5.12+ headers.

The definition of __ALIGN_KERNEL has moved in 5.12+ kernels, so we
add an explicit include of const.h to pickup the macro:

  | make: *** [Makefile:595: mkfs.btrfs] Error 1
  | make: *** Waiting for unfinished jobs....
  | libbtrfs.a(volumes.o): in function `dev_extent_search_start':
  | /usr/src/debug/btrfs-tools/5.12.1-r0/git/kernel-shared/volumes.c:464: undefined reference to `__ALIGN_KERNEL'
  | collect2: error: ld returned 1 exit status

This is safe for older kernels as well, since the header still
exists, and is valid to include.

(From OE-Core rev: 78eb20ed31e27865c990f96803215139bc99060f)

(From OE-Core rev: e81b531939214a1a34f8841a5f0aaf16fbbe4d08)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta/recipes-devtools/btrfs-tools/btrfs-tools_5.12.1.bb b/meta/recipes-devtools/btrfs-tools/btrfs-tools_5.12.1.bb
index 3fc959bf8e..d0c9cf2a99 100644
--- a/meta/recipes-devtools/btrfs-tools/btrfs-tools_5.12.1.bb
+++ b/meta/recipes-devtools/btrfs-tools/btrfs-tools_5.12.1.bb
@@ -18,6 +18,7 @@ DEPENDS_append_class-target = " udev"
 
 SRC_URI = "git://git.kernel.org/pub/scm/linux/kernel/git/kdave/btrfs-progs.git \
            file://0001-Add-a-possibility-to-specify-where-python-modules-ar.patch \
+           file://0001-btrfs-tools-include-linux-const.h-to-fix-build-with-.patch \
            "
 SRCREV = "96d77fcefdd3b9fd297b5aabbce6dc43e2315ee2"
 S = "${WORKDIR}/git"