The patch titled
Subject: arch/Kconfig: split PAGE_SIZE_LESS_THAN_256KB from PAGE_SIZE_LESS_THAN_64KB
has been added to the -mm tree. Its filename is
arch-kconfig-split-page_size_less_than_256kb-from-page_size_less_than_64kb.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/arch-kconfig-split-page_size_less_than_256kb-from-page_size_less_than_64kb.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/arch-kconfig-split-page_size_less_than_256kb-from-page_size_less_than_64kb.patch
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------------------------------------------------------
From: Nathan Chancellor <nathan@xxxxxxxxxx>
Subject: arch/Kconfig: split PAGE_SIZE_LESS_THAN_256KB from PAGE_SIZE_LESS_THAN_64KB
Patch series "Fix CONFIG_TEST_KMOD with 256kB page size".
The kernel test robot reported a build error [1] from a failed assertion
in fs/btrfs/inode.c with a hexagon randconfig that includes
CONFIG_PAGE_SIZE_256KB. This error is the same one that was addressed by
commit b05fbcc36be1 ("btrfs: disable build on platforms having page size
256K") but CONFIG_TEST_KMOD selects CONFIG_BTRFS without having the "page
size less than 256kB dependency", which results in the error reappearing.
The first patch introduces CONFIG_PAGE_SIZE_LESS_THAN_256KB by splitting
it off from CONFIG_PAGE_SIZE_LESS_THAN_64KB, which was introduced in
commit 1f0e290cc5fd ("arch: Add generic Kconfig option indicating page
size smaller than 64k") for a similar reason in 5.16-rc3.
The second patch uses that configuration option for CONFIG_BTRFS to reduce
duplication.
The third patch resolves the build error by adding
CONFIG_PAGE_SIZE_LESS_THAN_256KB as a dependency to CONFIG_TEST_KMOD so
that CONFIG_BTRFS does not get enabled under that invalid configuration.
[1]: https://lore.kernel.org/r/202111270255.UYOoN5VN-lkp@xxxxxxxxx/
This patch (of 3):
btrfs requires a page size smaller than 256kB. To use that dependency in
other places, introduce CONFIG_PAGE_SIZE_LESS_THAN_256KB and reuse that
dependency in CONFIG_PAGE_SIZE_LESS_THAN_64KB.
Link: https://lkml.kernel.org/r/20211129230141.228085-1-nathan@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20211129230141.228085-2-nathan@xxxxxxxxxx
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: David Sterba <dsterba@xxxxxxxx>
Cc: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/Kconfig | 4 ++++
1 file changed, 4 insertions(+)
--- a/arch/Kconfig~arch-kconfig-split-page_size_less_than_256kb-from-page_size_less_than_64kb
+++ a/arch/Kconfig
@@ -1005,6 +1005,10 @@ config PAGE_SIZE_LESS_THAN_64KB
depends on !PAGE_SIZE_64KB
depends on !PARISC_PAGE_SIZE_64KB
depends on !PPC_64K_PAGES
+ depends on PAGE_SIZE_LESS_THAN_256KB
+
+config PAGE_SIZE_LESS_THAN_256KB
+ def_bool y
depends on !PPC_256K_PAGES
depends on !PAGE_SIZE_256KB
_
Patches currently in -mm which might be from nathan@xxxxxxxxxx are
arch-kconfig-split-page_size_less_than_256kb-from-page_size_less_than_64kb.patch
btrfs-use-generic-kconfig-option-for-256kb-page-size-limit.patch
lib-kconfigdebug-make-test_kmod-depend-on-page_size_less_than_256kb.patch
