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kernel: dynamic: use 4k stack size for x86

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x86 architectures require a dynamic stack size that is a multiple
of 4096 bytes due to mmu restrictions.

For example, this test would previously fail when using the
default dynamic stack size of 1024 bytes for 32-bit
platforms.

```
west build -p auto -b qemu_x86/atom/nopae -t run \
  tests/posix/common/ -- -DCONFIG_USERSPACE=y
```

It would pass with an additional argument
```
west build -p auto -b qemu_x86/atom/nopae -t run \
  tests/posix/common/ -- -DCONFIG_USERSPACE=y \
  -DCONFIG_DYNAMIC_THREAD_STACK_SIZE=4096
```

Add a special default for x86 when using dynamic thread stacks.

The x86 default removes the need for `boards/qemu_x86*.conf`,
with the exception of `qemu_x86_tiny`.

qemu_x86_tiny did not have sufficient memory (or configuration)
to run the non-userspace tests, so bump up the available ram
from 256k to 512k for this test and clone the .conf from the
demand paging tests.

Eventually, the common posix test should be split into more
concise functional categories.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>
This commit is contained in:
Chris Friedt 2024-10-04 18:21:49 -04:00 • committed by Anas Nashif
commit b6aed5c505
5 changed files with 30 additions and 4 deletions
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1
tests/posix/common/boards/qemu_x86.conf
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@ -1 +0,0 @@
CONFIG_DYNAMIC_THREAD_STACK_SIZE=4096

1
tests/posix/common/boards/qemu_x86_64.conf
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CONFIG_DYNAMIC_THREAD_STACK_SIZE=4096

16
tests/posix/common/boards/qemu_x86_tiny.conf Normal file
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# Copyright (c) 2021 Intel Corporation
# SPDX-License-Identifier: Apache-2.0
# The test is highly sensitive to size of kernel image.
# However, specifying how many pages used by
# the backing store must be done in build time.
# So here we are, tuning this manually.
CONFIG_BACKING_STORE_RAM_PAGES=12
# The following is needed so that .text and following
# sections are present in physical memory to test
# using backing store for anonymous memory.
CONFIG_KERNEL_VM_BASE=0x0
CONFIG_LINKER_GENERIC_SECTIONS_PRESENT_AT_BOOT=y
CONFIG_BACKING_STORE_RAM=y
CONFIG_BACKING_STORE_QEMU_X86_TINY_FLASH=n

11
tests/posix/common/boards/qemu_x86_tiny.overlay Normal file
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/*
* Copyright (c) 2024, Tenstorrent AI ULC
*
* SPDX-License-Identifier: Apache-2.0
*/
/ {
dram0: memory@0 {
reg = <0x100000 0x80000>;
};
};