On 2024/12/6 12:29, Anshuman Khandual wrote:
On 11/26/24 14:26, Huang Shijie wrote:
The rodata=noalias is the original rodata=on.
The rodata=noalias can provide us more block mappings and contiguous hits
to map the linear region which minimize the TLB footprint. And the
linear aliases of pages belonging to read-only mappings in vmalloc
region are also marked as read-only.
Also update kernel-parameters.txt for it:
change "full" to "noalias"
Signed-off-by: Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx>
---
Documentation/admin-guide/kernel-parameters.txt | 2 +-
arch/arm64/include/asm/setup.h | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index dc663c0ca670..54b4df42e631 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5894,7 +5894,7 @@
rodata= [KNL,EARLY]
on Mark read-only kernel memory as read-only (default).
off Leave read-only kernel memory writable for debugging.
- full Mark read-only kernel memory and aliases as read-only
+ noalias Use more block mappings,may have better performance.
[arm64]
rockchip.usb_uart
diff --git a/arch/arm64/include/asm/setup.h b/arch/arm64/include/asm/setup.h
index 5ded3bd11476..3d96dde4d214 100644
--- a/arch/arm64/include/asm/setup.h
+++ b/arch/arm64/include/asm/setup.h
@@ -31,7 +31,7 @@ static inline bool arch_parse_debug_rodata(char *arg)
return true;
}
- if (!strcmp(arg, "full")) {
+ if (!strcmp(arg, "noalias")) {
rodata_enabled = true;
rodata_full = false;
return true;
This patch should be folded back into [PATCH 1/4] ensuring that
Thanks, I will do it in next version.
- "rodata=" processing gets updated completely i.e dropping 'full',
adding new 'noalias' and also updating the documentation at once
- Avoids temporary the "full" option breakage as mentioned earlier
Also please do add in code comment above arch_parse_debug_rodata()
function explaining all the options after these update.
No problem.
Thanks
Huang Shijie
