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spf=pass smtp.mailfrom=abrodkin@synopsys.com X-Mailman-Original-Authentication-Results: o365relay-in.synopsys.com; dkim=pass (1024-bit key; unprotected) header.d=synopsys.com header.i=@synopsys.com header.b="NSg2b+RN"; dkim-atps=neutral Subject: Re: [Buildroot] [arc-buildroot] [PATCH] arch: remove support for BR2_ARC_PAGE_SIZE_4K X-BeenThere: buildroot@buildroot.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion and development of buildroot List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Alexey Brodkin via buildroot Reply-To: Alexey Brodkin Cc: ARC Maintainers , Buildroot mailing list Content-Type: multipart/mixed; boundary="===============8435959041048967885==" Errors-To: buildroot-bounces@buildroot.org Sender: "buildroot" --===============8435959041048967885== Content-Language: en-US Content-Type: multipart/alternative; boundary="_000_IA1PR12MB62105EDFE310AD93A55A33B6A18D9IA1PR12MB6210namp_" --_000_IA1PR12MB62105EDFE310AD93A55A33B6A18D9IA1PR12MB6210namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi Thomas, Please let me take a look at this one. The point is we do use 4 KiB page for building for the ARCv3 processors, see https://github.com/foss-for-synopsys-dwc-arc-processors/buildroot/blob/= arc64/arch/Config.in.arc#L133. And so far I haven't seen any problems with either uClibc or glibc. And since I don't immediately see any changes in Binutils for ARCv3 which t= ouch "common-page-size", I'd like to figure out what goes wrong here. I'll get back to you soon with some explanation of what we see here. -Alexey ________________________________ From: Thomas Petazzoni Sent: Monday, July 18, 2022 12:04 AM To: buildroot@buildroot.org Cc: Thomas Petazzoni ; ARC Maintainers Subject: [arc-buildroot] [PATCH] arch: remove support for BR2_ARC_PAGE_SIZE= _4K BR2_ARC_PAGE_SIZE_4K=3Dy is broken with both glibc and uClibc. The link of the C library fails with: ld: common page size (0x2000) > maximum page size (0x1000) This is due to BR2_ARC_PAGE_SIZE_4K=3Dy settings -Wl,-z,max-page-size=3D4096, but binutils apparently defaulting to common-page-size=3D8192. While this could potentially be fixed by passing -Wl,-z,common-page-size=3D4096, these failures indicates that nobody has tested 4KB page sizes on ARC in the context of Buildroot, so it is more sensible to drop support for this feature. Should anybody need this, and have the ability to ensure that it works, we would certainly be able to re-introduce the feature. Fixes: https://urldefense.com/v3/__http://autobuild.buildroot.net/results/c8b2f3= 31c98453670cd982558144c4fd84674a3d/__;!!A4F2R9G_pg!d146KtaYDg9TTYEfT0WXaW0a= ZMlQQKFLOg2D6B-sBZTaF-Z9vn7WvMcW7awUpJi0eotuvN5Rby7WE8qT-3KSx15eJwata0p_gA$= (uclibc) https://urldefense.com/v3/__http://autobuild.buildroot.net/results/3a22f7= aac38145b26c549254b819f87329e7a77e/__;!!A4F2R9G_pg!d146KtaYDg9TTYEfT0WXaW0a= ZMlQQKFLOg2D6B-sBZTaF-Z9vn7WvMcW7awUpJi0eotuvN5Rby7WE8qT-3KSx15eJwbxDr7yig$= (glibc) Signed-off-by: Thomas Petazzoni --- Config.in.legacy | 7 +++++++ arch/Config.in.arc | 5 ----- arch/arch.mk.arc | 4 +--- linux/linux.mk | 4 ---- 4 files changed, 8 insertions(+), 12 deletions(-) diff --git a/Config.in.legacy b/Config.in.legacy index 956da10a9f..1590a9fa25 100644 --- a/Config.in.legacy +++ b/Config.in.legacy @@ -146,6 +146,13 @@ endif comment "Legacy options removed in 2022.08" +config BR2_ARC_PAGE_SIZE_4K + bool "Support for 4KB pages on ARC removed" + select BR2_LEGACY + help + The support to use 4KB pages on the ARC architecture has + been removed, as it was broken with both glibc and uClibc. + config BR2_PACKAGE_PHP_EXT_WDDX bool "php wddx removed" select BR2_LEGACY diff --git a/arch/Config.in.arc b/arch/Config.in.arc index 388d3496bc..58103ad171 100644 --- a/arch/Config.in.arc +++ b/arch/Config.in.arc @@ -103,10 +103,6 @@ choice size matching the hardware configuration. Otherwise user-space applications will fail at runtime. -config BR2_ARC_PAGE_SIZE_4K - bool "4KB" - depends on !BR2_arc750d - config BR2_ARC_PAGE_SIZE_8K bool "8KB" help @@ -121,7 +117,6 @@ endchoice config BR2_ARC_PAGE_SIZE string - default "4K" if BR2_ARC_PAGE_SIZE_4K default "8K" if BR2_ARC_PAGE_SIZE_8K default "16K" if BR2_ARC_PAGE_SIZE_16K diff --git a/arch/arch.mk.arc b/arch/arch.mk.arc index 32b818b0e0..697c0ff524 100644 --- a/arch/arch.mk.arc +++ b/arch/arch.mk.arc @@ -6,9 +6,7 @@ ARCH_TOOLCHAIN_WRAPPER_OPTS =3D -matomic endif # Explicitly set LD's "max-page-size" instead of relying on some defaults -ifeq ($(BR2_ARC_PAGE_SIZE_4K),y) -ARCH_TOOLCHAIN_WRAPPER_OPTS +=3D -Wl,-z,max-page-size=3D4096 -else ifeq ($(BR2_ARC_PAGE_SIZE_8K),y) +ifeq ($(BR2_ARC_PAGE_SIZE_8K),y) ARCH_TOOLCHAIN_WRAPPER_OPTS +=3D -Wl,-z,max-page-size=3D8192 else ifeq ($(BR2_ARC_PAGE_SIZE_16K),y) ARCH_TOOLCHAIN_WRAPPER_OPTS +=3D -Wl,-z,max-page-size=3D16384 diff --git a/linux/linux.mk b/linux/linux.mk index 322ccabbd9..f012689a9e 100644 --- a/linux/linux.mk +++ b/linux/linux.mk @@ -362,10 +362,6 @@ define LINUX_KCONFIG_FIXUP_CMDS $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI)) $(if $(BR2_powerpc)$(BR2_powerpc64)$(BR2_powerpc64le), $(call KCONFIG_ENABLE_OPT,CONFIG_PPC_DISABLE_WERROR)) - $(if $(BR2_ARC_PAGE_SIZE_4K), - $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K) - $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K) - $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K)) $(if $(BR2_ARC_PAGE_SIZE_8K), $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K) $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K) -- 2.36.1 --_000_IA1PR12MB62105EDFE310AD93A55A33B6A18D9IA1PR12MB6210namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Hi Thomas,

Please let me take a look at this one.

The point is we do use 4 KiB page for building for the ARCv3 processors,
see https://github.com/foss-for-= synopsys-dwc-arc-processors/buildroot/blob/arc64/arch/Config.in.arc#L133.
And so far I haven't seen any problems with either uClibc or glibc.

And since I don't immediately see any changes in Binutils for ARCv3 which t= ouch
"common-page-size", I'd like to figure out what goes wrong here.<= /div>

I'll get back to you soon with some explanation of what we see here.

-Alexey
From: Thomas Petazzoni <= thomas.petazzoni@bootlin.com>
Sent: Monday, July 18, 2022 12:04 AM
To: buildroot@buildroot.org <buildroot@buildroot.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>; ARC Maint= ainers <arc-buildroot@synopsys.com>
Subject: [arc-buildroot] [PATCH] arch: remove support for BR2_ARC_PA= GE_SIZE_4K
 
BR2_ARC_PAGE_SIZE_4K=3Dy is broken with both glibc= and uClibc. The link
of the C library fails with:

ld: common page size (0x2000) > maximum page size (0x1000)

This is due to BR2_ARC_PAGE_SIZE_4K=3Dy settings
-Wl,-z,max-page-size=3D4096, but binutils apparently defaulting to
common-page-size=3D8192.

While this could potentially be fixed by passing
-Wl,-z,common-page-size=3D4096, these failures indicates that nobody has tested 4KB page sizes on ARC in the context of Buildroot, so it is
more sensible to drop support for this feature. Should anybody need
this, and have the ability to ensure that it works, we would certainly
be able to re-introduce the feature.

Fixes:

  https://urldefense.com/v3/__http://autobuild.buildroot.net/results/c8b2f331= c98453670cd982558144c4fd84674a3d/__;!!A4F2R9G_pg!d146KtaYDg9TTYEfT0WXaW0aZM= lQQKFLOg2D6B-sBZTaF-Z9vn7WvMcW7awUpJi0eotuvN5Rby7WE8qT-3KSx15eJwata0p_gA$  (uclibc)
  https://urldefense.com/v3/__http://autobuild.buildroot.net/results/3a22f7aa= c38145b26c549254b819f87329e7a77e/__;!!A4F2R9G_pg!d146KtaYDg9TTYEfT0WXaW0aZM= lQQKFLOg2D6B-sBZTaF-Z9vn7WvMcW7awUpJi0eotuvN5Rby7WE8qT-3KSx15eJwbxDr7yig$  (glibc)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
---
 Config.in.legacy   | 7 +++++++
 arch/Config.in.arc | 5 -----
 arch/arch.mk.arc   | 4 +---
 linux/linux.mk     | 4 ----
 4 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/Config.in.legacy b/Config.in.legacy
index 956da10a9f..1590a9fa25 100644
--- a/Config.in.legacy
+++ b/Config.in.legacy
@@ -146,6 +146,13 @@ endif
 
 comment "Legacy options removed in 2022.08"
 
+config BR2_ARC_PAGE_SIZE_4K
+       bool "Support for 4KB pages on A= RC removed"
+       select BR2_LEGACY
+       help
+         The support to use 4KB pa= ges on the ARC architecture has
+         been removed, as it was b= roken with both glibc and uClibc.
+
 config BR2_PACKAGE_PHP_EXT_WDDX
         bool "php wddx remove= d"
         select BR2_LEGACY
diff --git a/arch/Config.in.arc b/arch/Config.in.arc
index 388d3496bc..58103ad171 100644
--- a/arch/Config.in.arc
+++ b/arch/Config.in.arc
@@ -103,10 +103,6 @@ choice
           size matching = the hardware configuration. Otherwise
           user-space app= lications will fail at runtime.
 
-config BR2_ARC_PAGE_SIZE_4K
-       bool "4KB"
-       depends on !BR2_arc750d
-
 config BR2_ARC_PAGE_SIZE_8K
         bool "8KB"
         help
@@ -121,7 +117,6 @@ endchoice
 
 config BR2_ARC_PAGE_SIZE
         string
-       default "4K" if BR2_ARC_PAG= E_SIZE_4K
         default "8K" if = BR2_ARC_PAGE_SIZE_8K
         default "16K" if= BR2_ARC_PAGE_SIZE_16K
 
diff --git a/arch/arch.mk.arc b/arch/arch.mk.arc
index 32b818b0e0..697c0ff524 100644
--- a/arch/arch.mk.arc
+++ b/arch/arch.mk.arc
@@ -6,9 +6,7 @@ ARCH_TOOLCHAIN_WRAPPER_OPTS =3D -matomic
 endif
 
 # Explicitly set LD's "max-page-size" instead of relying on= some defaults
-ifeq ($(BR2_ARC_PAGE_SIZE_4K),y)
-ARCH_TOOLCHAIN_WRAPPER_OPTS +=3D -Wl,-z,max-page-size=3D4096
-else ifeq ($(BR2_ARC_PAGE_SIZE_8K),y)
+ifeq ($(BR2_ARC_PAGE_SIZE_8K),y)
 ARCH_TOOLCHAIN_WRAPPER_OPTS +=3D -Wl,-z,max-page-size=3D8192
 else ifeq ($(BR2_ARC_PAGE_SIZE_16K),y)
 ARCH_TOOLCHAIN_WRAPPER_OPTS +=3D -Wl,-z,max-page-size=3D16384
diff --git a/linux/linux.mk b/linux/linux.mk
index 322ccabbd9..f012689a9e 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -362,10 +362,6 @@ define LINUX_KCONFIG_FIXUP_CMDS
            &nb= sp;    $(call KCONFIG_ENABLE_OPT,CONFIG_AEABI))
         $(if $(BR2_powerpc)$(BR2_p= owerpc64)$(BR2_powerpc64le),
            &nb= sp;    $(call KCONFIG_ENABLE_OPT,CONFIG_PPC_DISABLE_WERROR))=
-       $(if $(BR2_ARC_PAGE_SIZE_4K),
-            &n= bsp;  $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)
-            &n= bsp;  $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K)
-            &n= bsp;  $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_16K))
         $(if $(BR2_ARC_PAGE_SIZE_8= K),
            &nb= sp;    $(call KCONFIG_DISABLE_OPT,CONFIG_ARC_PAGE_SIZE_4K)             &nb= sp;    $(call KCONFIG_ENABLE_OPT,CONFIG_ARC_PAGE_SIZE_8K) --
2.36.1

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