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ANDROID: mm: Set PAGE_BLOCK_ORDER to 8 when ARM64_16K_PAGES

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This config will allow the 16kb page size kernels to have the
same CMA_MIN_ALIGNMENT_BYTES that 4k kernels. This means that
the CMA configs for the drivers won't have to change.

Note: This change is needed to avoid breaking old kernel
builds.

Bug: 424212284
Bug: 375647879
Bug: 355449177
Bug: 418282543
Test: tools/bazel run //common:kernel_aarch64_dist
      tools/bazel run //common:kernel_aarch64_16k_dist
      tools/bazel run //common:kernel_x86_64_dist
Change-Id: Icbfcab0d7e5ba18b3fc35c1186ef79e82f3e7ab1
Signed-off-by: Juan Yescas <jyescas@google.com>
This commit is contained in:
Juan Yescas
2025-06-12 16:01:53 -07:00
parent 74db64dcc8
commit 6246d345f5
1 changed files with 8 additions and 0 deletions
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8
mm/Kconfig
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@@ -928,6 +928,13 @@ config CMA_AREAS
config ARCH_FORCE_MAX_ORDER
int
#
# Select this config option from the ARM64 architecture Kconfig to set
# the page size to 16KB.
# See b/424212284 for more information.
config ARM64_16K_PAGES
bool
#
# When ARCH_FORCE_MAX_ORDER is not defined,
# the default page block order is MAX_ORDER (10) as per
@@ -937,6 +944,7 @@ config PAGE_BLOCK_ORDER
int "Page Block Order"
range 1 10 if ARCH_FORCE_MAX_ORDER = 0 || ARCH_FORCE_MAX_ORDER = ""
default 10 if ARCH_FORCE_MAX_ORDER = 0 || ARCH_FORCE_MAX_ORDER = ""
default 8 if ARM64_16K_PAGES
range 1 ARCH_FORCE_MAX_ORDER if ARCH_FORCE_MAX_ORDER != 0
default ARCH_FORCE_MAX_ORDER if ARCH_FORCE_MAX_ORDER != 0
help