The patch titled
Subject: mm/mm_init.c: remove the useless dma_reserve
has been added to the -mm mm-unstable branch. Its filename is
mm-mm_initc-remove-the-useless-dma_reserve.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mm_initc-remove-the-useless-dma_reserve.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Baoquan He <bhe@xxxxxxxxxx>
Subject: mm/mm_init.c: remove the useless dma_reserve
Date: Mon, 25 Mar 2024 22:56:42 +0800
Now nobody calls set_dma_reserve() to set value for dma_reserve, remove
set_dma_reserve(), global variable dma_reserve and the codes using it.
Link: https://lkml.kernel.org/r/20240325145646.1044760-3-bhe@xxxxxxxxxx
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
Cc: "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 1 -
mm/mm_init.c | 23 -----------------------
2 files changed, 24 deletions(-)
--- a/include/linux/mm.h~mm-mm_initc-remove-the-useless-dma_reserve
+++ a/include/linux/mm.h
@@ -3247,7 +3247,6 @@ static inline int early_pfn_to_nid(unsig
extern int __meminit early_pfn_to_nid(unsigned long pfn);
#endif
-extern void set_dma_reserve(unsigned long new_dma_reserve);
extern void mem_init(void);
extern void __init mmap_init(void);
--- a/mm/mm_init.c~mm-mm_initc-remove-the-useless-dma_reserve
+++ a/mm/mm_init.c
@@ -227,7 +227,6 @@ static unsigned long required_movablecor
static unsigned long nr_kernel_pages __initdata;
static unsigned long nr_all_pages __initdata;
-static unsigned long dma_reserve __initdata;
static bool deferred_struct_pages __meminitdata;
@@ -1584,12 +1583,6 @@ static void __init free_area_init_core(s
zone_names[j], memmap_pages, freesize);
}
- /* Account for reserved pages */
- if (j == 0 && freesize > dma_reserve) {
- freesize -= dma_reserve;
- pr_debug(" %s zone: %lu pages reserved\n", zone_names[0], dma_reserve);
- }
-
if (!is_highmem_idx(j))
nr_kernel_pages += freesize;
/* Charge for highmem memmap if there are enough kernel pages */
@@ -2548,22 +2541,6 @@ void *__init alloc_large_system_hash(con
return table;
}
-/**
- * set_dma_reserve - set the specified number of pages reserved in the first zone
- * @new_dma_reserve: The number of pages to mark reserved
- *
- * The per-cpu batchsize and zone watermarks are determined by managed_pages.
- * In the DMA zone, a significant percentage may be consumed by kernel image
- * and other unfreeable allocations which can skew the watermarks badly. This
- * function may optionally be used to account for unfreeable pages in the
- * first zone (e.g., ZONE_DMA). The effect will be lower watermarks and
- * smaller per-cpu batchsize.
- */
-void __init set_dma_reserve(unsigned long new_dma_reserve)
-{
- dma_reserve = new_dma_reserve;
-}
-
void __init memblock_free_pages(struct page *page, unsigned long pfn,
unsigned int order)
{
_
Patches currently in -mm which might be from bhe@xxxxxxxxxx are
mm-vmallocc-optimize-to-reduce-arguments-of-alloc_vmap_area.patch
x86-remove-unneeded-memblock_find_dma_reserve.patch
mm-mm_initc-remove-the-useless-dma_reserve.patch
mm-mm_initc-add-new-function-calc_nr_all_pages.patch
mm-mm_initc-remove-meaningless-calculation-of-zone-managed_pages-in-free_area_init_core.patch
mm-mm_initc-remove-unneeded-calc_memmap_size.patch
mm-mm_initc-remove-arch_reserved_kernel_pages.patch
