mm: make the alignment length in mm consistent with Kasan

[W-M-R]

Summary

mm: The alignment length in mm is consistent with Kasan

preceding will cause the mm alignment to be inconsistent with the kasan alignment

Impact

Update this section, where applicable, on how change affects users,
build process, hardware, documentation, security, compatibility, etc.

Testing

Update this section with details on how did you verify the change,
what Host was used for build (OS, CPU, compiler, ..), what Target was
used for verification (arch, board:config, ..), etc. Providing build
and runtime logs from before and after change is highly appreciated.

[nuttxpr]

[Experimental Bot, please feedback here]

No, this PR does not fully meet the NuttX requirements. While it provides a title and attempts to address the summary and impact, it lacks crucial details and proper formatting.

Here's a breakdown of what's missing:

• Summary: While the summary mentions what is being changed, it lacks clarity. It repeats the title and doesn't explain why this change is necessary. What problem does the inconsistency cause? What are the benefits of aligning mm with Kasan? There's no mention of related issues.
• Impact: The PR placeholder text is left in. This section needs to be filled out with specifics. Every impact item needs a YES/NO answer followed by a description if the answer is YES. Even if the impact is NO across the board, the PR submitter should explicitly state this.
• Testing: Completely empty. This section requires details about the testing environment (host and target) and, importantly, logs from before and after the change to demonstrate the fix. Simply stating "works as intended" is insufficient.

To be accepted, the PR needs significant revision to address these shortcomings. The submitter must:

1. Expand the Summary: Explain the rationale behind the change. What problem does it solve? What are the benefits? Include links to related issues if applicable.
2. Complete the Impact Assessment: Address each point specifically, even if the answer is NO.
3. Provide Thorough Testing Information: Detail the testing environment and include "before" and "after" logs to demonstrate the change's effectiveness.

In short, the PR needs more context, detail, and evidence of testing to meet the NuttX requirements.

[GUIDINGLI]

how about remove KASAN_SHADOW_SCALE

[W-M-R]

After aligning the prefix and structure, mm and kasan can share the same ALIGN, or write
#define KASAN_SHADOW_SCALE MM_ALIGN

[xiaoxiang781216]

where extend mm_allocnode_s?

[W-M-R]

Expanded by the last

struct mm_allocnode_s
{
xxxxx;
}aligned_data(MM_ALIGN);