Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1

[PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-09-29
[PATCH 1/6] mm/sparsemem: Allocate mem_section at runtime for SPARSEMEM_EXTREME · Kirill A. Shutemov <hidden> · 2017-09-29
[PATCH 6/6] x86/boot/compressed/64: Detect and handle 5-level paging at boot-time · Kirill A. Shutemov <hidden> · 2017-09-29
[PATCH 5/6] x86/xen: Drop 5-level paging support code from XEN_PV code · Kirill A. Shutemov <hidden> · 2017-09-29
[PATCH 3/6] x86/kasan: Use the same shadow offset for 4- and 5-level paging · Kirill A. Shutemov <hidden> · 2017-09-29
[PATCH 4/6] x86/xen: Provide pre-built page tables only for XEN_PV and XEN_PVH · Kirill A. Shutemov <hidden> · 2017-09-29
[PATCH 2/6] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS · Kirill A. Shutemov <hidden> · 2017-09-29
Re: [PATCH 2/6] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS · Nitin Gupta <hidden> · 2017-10-14
Re: [PATCH 2/6] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS · Kirill A. Shutemov <hidden> · 2017-10-16
Re: [PATCH 2/6] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS · Nitin Gupta <hidden> · 2017-10-18
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-03
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-17
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-20
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-20
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-20
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-20
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-23
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-23
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-23
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-23
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-24
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-24
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-24
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-24
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-26
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-26
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Ingo Molnar <mingo@kernel.org> · 2017-10-31
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-31
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Minchan Kim <minchan@kernel.org> · 2017-10-20
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-20
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · hpa@zytor.com · 2017-10-24
Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1 · Kirill A. Shutemov <hidden> · 2017-10-24

From: Kirill A. Shutemov <hidden>
Date: 2017-10-23 12:48:16
Also in: lkml

On Mon, Oct 23, 2017 at 02:40:14PM +0200, Ingo Molnar wrote:

* Kirill A. Shutemov [off-list ref] wrote:

quoted

Making a variable that 'looks' like a constant macro dynamic in a rare Kconfig 
scenario is asking for trouble.

We expect boot-time page mode switching to be enabled in kernel of next
generation enterprise distros. It shoudn't be that rare.

My point remains even with not-so-rare Kconfig dependency.

I don't follow how introducing new variable that depends on Kconfig option
would help with the situation.

We would end up with inverse situation: people would use MAX_PHYSMEM_BITS
where the new variable need to be used and we will in the same situation.

-- 
 Kirill A. Shutemov

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

`h`	back out one level
`j`	next message in thread
`k`	previous message in thread
`l`	drill in
`Esc`	close help / fold thread tree
`?`	toggle this help