On 8/6/21 2:51 AM, SeongJae Park wrote:
From: SeongJae Park <sjpark@xxxxxxxxx>
Commit 128fd80c4c07 ("mm/idle_page_tracking: Make PG_idle reusable") of
linux-mm[1] allows PAGE_IDLE_FLAG to be set without PAGE_EXTENSION
while 64BIT is not set. This makes 'enum page_ext_flags' undefined, so
build fails as below for the config (!64BIT, !PAGE_EXTENSION, and
IDLE_PAGE_FLAG).
$ make ARCH=i386 allnoconfig
$ echo 'CONFIG_PAGE_IDLE_FLAG=y' >> .config
$ make olddefconfig
$ make ARCH=i386
[...]
../include/linux/page_idle.h: In function ‘folio_test_young’:
../include/linux/page_idle.h:25:18: error: ‘PAGE_EXT_YOUNG’ undeclared (first use in this function); did you mean ‘PAGEOUTRUN’?
return test_bit(PAGE_EXT_YOUNG, &page_ext->flags);
[...]
This commit fixes this issue by making PAGE_EXTENSION to be set when
64BIT is not set and PAGE_IDLE_FLAG is set.
[1] https://github.com/hnaz/linux-mm/commit/128fd80c4c07
Fixes: 128fd80c4c07 ("mm/idle_page_tracking: Make PG_idle reusable")
Reported-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Signed-off-by: SeongJae Park <sjpark@xxxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx> # build-tested
Thanks.
---
mm/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index d0b85dc12429..50ca602edeb6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -741,6 +741,7 @@ config DEFERRED_STRUCT_PAGE_INIT
config PAGE_IDLE_FLAG
bool "Add PG_idle and PG_young flags"
+ select PAGE_EXTENSION if !64BIT
help
This feature adds PG_idle and PG_young flags in 'struct page'. PTE
Accessed bit writers can set the state of the bit in the flags to let
@@ -749,7 +750,6 @@ config PAGE_IDLE_FLAG
config IDLE_PAGE_TRACKING
bool "Enable idle page tracking"
depends on SYSFS && MMU && BROKEN
- select PAGE_EXTENSION if !64BIT
select PAGE_IDLE_FLAG
help
This feature allows to estimate the amount of user pages that have
--
~Randy
