From: Pavel Kozlov
Since commit d9820ff ("ARC: mm: switch pgtable_t back to struct page *")
a memory leakage problem occurs. Memory allocated for page table entries
not released during process termination. This issue can be reproduced by
a small program that allocates a large amount
> Good catch. Curious how did you find it. KMEMCHECK or some such or just oom.
I've run glibc tests with 5.16 kernel and got many oom-killer messages and even
kernel
panic because lack of memory. These symptoms pointed to an issue. kmemleak
didn't
show anything. Didn't try kmemcheck. I prepare
From: Pavel Kozlov
The ARCv2 ABI requires 4 byte stack pointer alignment. Don't allow to
use unaligned child stack in clone. As the stack grows down,
align it down.
This was pointed by misc/tst-misalign-clone-internal and
misc/tst-misalign-clone tests. Stack alignmet fixes these tests
From: Pavel Kozlov
Add extra check for compiler definitions to ensure that compiler provides
sqrt and fma hw fpu instructions else use software implementation.
As divide/sqrt and FMA hw support from CPU side is optional,
the compiler can be configured by options to generate hw FPU instructions
From: Pavel Kozlov
Add extra check for compiler definitions to ensure that compiler provides
sqrt and fma hw fpu instructions else use software implementation.
As divide/sqrt and FMA hw support from CPU side is optional,
the compiler can be configured by options to generate hw FPU instructions
> This is wrong, sqrt use macro do not belong for the fma switch file.
Thank you for the review and your notice. I was inattentive when
moving changes from the branch I had. This has been fixed in
v2 of the patch [1].
I've manually checked (by objdump -d output review) that now
expected code for
> LGTM, although I can't really test it since the Synopsys qemu tree does not
> have qemu-user support [1].
Thank you for the review. I've checked this patch on QEMU with Linux system
and on the ARC HSDK board.
Also, I can say that it is possible to run ARC binaries on QEMU [1] in
user mode. Curre
e, HW verification or review will be required, all concerning ARC.
I've requested the sourceware.org account.
Looking forward to the next steps.
Thank you,
Pavel
From: Carlos O'Donell
Sent: Wednesday, February 1, 2023 12:33 AM
To: Vineet Gupta
Cc: arcml ; Pavel Kozlov
; GNU C Libra
From: Pavel Kozlov
Add support for the configuration with 4K Page Size and enabled ARC_PAE40.
Set two-level Page Table to 10:9:12, as with PAE40 a 4k page can settle
only 512 entries (with PAE40 size of PTE entry increases from 4 to 8
bytes).
In this configuration the Page Table can describe
ute to the community. I'm always looking for opportunities to connect
with other developers and learn from their experiences.
As a final step of setup, I've updated wiki and added myself as ARC
maintainer. Also, thanks Carlos, for help with my setup.
Best r
From: Pavel Kozlov
Use the clone3 wrapper on ARC. It doesn't care about stack alignment.
All callers should provide an aligned stack.
It follows the internal signature:
extern int clone3 (struct clone_args *__cl_args, size_t __size,
int (*__func) (void *__arg), void *__arg);
---
Checked o
From: Pavel Kozlov
For better debug experience use separate code block with extra
cfi_* directives to run child (same as in __clone3).
---
sysdeps/unix/sysv/linux/arc/clone.S | 40 ++---
1 file changed, 25 insertions(+), 15 deletions(-)
diff --git a/sysdeps/unix/sysv
From: Pavel Kozlov
Notify a compiler about write operations and prevent unwanted
optimizations. Add the "memory" clobber to the clobber list.
An obvious problem with unwanted compiler optimizations appeared after
the cpumask optimization commit 596ff4a09b89 ("cpumask: re-int
Hi Vineet,
I'm testing your updates and ran into the same build issue reported by the
build
robot.
http://lists.infradead.org/pipermail/linux-snps-arc/2023-August/007522.html
> #ifdef CONFIG_ISA_ARCOMPACT
> @@ -40,18 +51,7 @@ struct pt_regs {
> *Last word used by Linux for ext
Hi Vineet,
> Subject: [PATCH 16/20] ARC: entry: Add more common chores to
> EXCEPTION_PROLOGUE
>
> THe high level structure of most ARC exception handlers is
> 1. save regfile with EXCEPTION_PROLOGUE
> 2. setup r0: EFA (not part of pt_regs)
> 3. setup r1: pointer to pt_regs (SP)
> 4.
> -Vineet
The entire "ARC updates" patch series (with all subsequent patches with updates)
has been tested on the HSDK borard for ARCv2 using the glibc and ksefltest test
framworks and on nSIM for ARCompact using the uclibc tests. No regressions
found.
Hi Vineet,
> A pile of accrued changes, compile tested only.
> Please test.
> Thx,
> -Vineet
I'm testing you patches. At first glance everything is fine, no obvious
regressions.
But I've found an ARC build issue with the latest upstream source
(tag: v6.7-rc5). It is not linked with your updates
From: Pavel Kozlov
Add hugetlb definitions if THP enabled. ARC doesn't support
HugeTLB FS but it supports THP. Some kernel code such as pagemap
uses hugetlb definitions with THP.
This patch fixes ARC build issue (HPAGE_SIZE undeclared error) with
TRANSPARENT_HUGEPAGE enabled.
Signed-o
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