Hi Kazu,
Compatible with google android GKI changes,
SECTION_SIZE_BITS = 27 when defined 4K_PAGES or 16K_PAGES.
SECTION_SIZE_BITS = 29 when defined 64K_PAGES.
Link: https://lore.kernel.org/lkml/15cf9a2359197fee0168f820c5c904650d07939e.1610146597.git.sudaraja@codeaurora.org
Link: https://lore.kernel.org/all/43843c5e092bfe3ec4c41e3c8c78a7ee35b69bb0.1611206601.git.sudaraja@codeaurora.org
See: https://cs.android.com/android/_/android/kernel/common/+/673e9ab6b64f981159aeff3b65675bb7dbedecd8
Before android-12-gki:
crash> help -m | grep section_size_bits
section_size_bits: 30
The first PFN error, the physical address should be 0x40000000.
crash> kmem -p
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
ffffffff06e00000 200000000 ffffff80edf4fa12 ffffffff070f3640 1 4000000000002000 private
After android-12-gki:
crash> help -m | grep section
section_size_bits: 27
crash> kmem -p
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
fffffffeffe00000 40000000 0 0 1 1000 reserved
Signed-off-by: chenguanyou <chenguanyou@xiaomi.com>
---
arm64.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/arm64.c b/arm64.c
index e36c723..50e22ea 100644
--- a/arm64.c
+++ b/arm64.c
@@ -1629,7 +1629,16 @@ arm64_get_section_size_bits(void)
if ((ret = get_kernel_config("CONFIG_HOTPLUG_SIZE_BITS", &string)) == IKCONFIG_STR)
machdep->section_size_bits = atol(string);
}
- }
+
+ // arm64: reduce section size for sparsemem
+ if ((ret = get_kernel_config("CONFIG_ARM64_4K_PAGES", NULL)) == IKCONFIG_Y
+ || (ret = get_kernel_config("CONFIG_ARM64_16K_PAGES", NULL)) == IKCONFIG_Y)
+ machdep->section_size_bits = _SECTION_SIZE_BITS_5_12;
+ // arm64/sparsemem: reduce SECTION_SIZE_BITS
+ else if ((ret = get_kernel_config("CONFIG_ARM64_64K_PAGES", NULL)) == IKCONFIG_Y)
+ machdep->section_size_bits = _SECTION_SIZE_BITS_5_12_64K;
+
+ }
if (CRASHDEBUG(1))
fprintf(fp, "SECTION_SIZE_BITS: %ld\n", machdep->section_size_bits);
--
2.39.0
Thanks,
Guanyou.Chen