[Buildroot] [git commit] arch/arc: explicitly set "max-page-size" for GNU LD

Thomas Petazzoni thomas.petazzoni at bootlin.com
Wed Dec 25 21:09:52 UTC 2019

commit: https://git.buildroot.net/buildroot/commit/?id=3cc2c6d19ab2e1bb4634f26f9318da9b07df5fff
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Back in the day we relied on a default value that used to be 8KiB
and it worked perfectly fine for ARC's default 8KiB page as well as
4 KiB ones, but not for 16 KiB, see [1] for more details.

So that we fixed by setting "max-page-size" if 16KiB pages are in use by
commit d024d369b82d2 ("arch/arc: Accommodate 16 KiB MMU pages").

But as Yann very rightfully mentioned here [2] we should be setting this
thing explicitly for all page sizes because:
 1. Defaults might change unexpectedly
 2. Explicitly set stuff is better understood
 3. We act similarly to all settings but not only addressing some corner cases

[1] https://git.buildroot.org/buildroot/commit/?id=d024d369b82d2d3d9d4d75489c19e9488202bca0
[2] https://patchwork.ozlabs.org/patch/1212544/#2330647

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Yann E. MORIN <yann.morin.1998 at free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
 arch/arch.mk.arc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/arch.mk.arc b/arch/arch.mk.arc
index 9c04a85a8d..32b818b0e0 100644
--- a/arch/arch.mk.arc
+++ b/arch/arch.mk.arc
@@ -5,9 +5,12 @@ ifeq ($(BR2_ARC_ATOMIC_EXT),y)
-# By default MAXPAGESIZE for ARC is 8192 so for larger MMU pages
-# it needs to be overridden.
-ifeq ($(BR2_ARC_PAGE_SIZE_16K),y)
+# Explicitly set LD's "max-page-size" instead of relying on some defaults
+ifeq ($(BR2_ARC_PAGE_SIZE_4K),y)
+ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=4096
+else ifeq ($(BR2_ARC_PAGE_SIZE_8K),y)
+ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=8192
+else ifeq ($(BR2_ARC_PAGE_SIZE_16K),y)
 ARCH_TOOLCHAIN_WRAPPER_OPTS += -Wl,-z,max-page-size=16384

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