The patch titled
Subject: memblock: add MEMBLOCK_RSRV_KERN flag
has been added to the -mm mm-nonmm-unstable branch. Its filename is
memblock-add-memblock_rsrv_kern-flag.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/memblock-add-memblock_rsrv_kern-flag.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>
Subject: memblock: add MEMBLOCK_RSRV_KERN flag
Date: Thu, 6 Feb 2025 15:27:42 +0200
To denote areas that were reserved for kernel use either directly with
memblock_reserve_kern() or via memblock allocations.
Link: https://lkml.kernel.org/r/20250206132754.2596694-3-rppt@xxxxxxxxxx
Signed-off-by: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx>
Cc: Alexander Graf <graf@xxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Anthony Yznaga <anthony.yznaga@xxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Ashish Kalra <ashish.kalra@xxxxxxx>
Cc: Ben Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Betkov <bp@xxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: James Gowans <jgowans@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
Cc: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Cc: Pratyush Yadav <ptyadav@xxxxxxxxx>
Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: Rob Herring <robh@xxxxxxxxxx>
Cc: Saravana Kannan <saravanak@xxxxxxxxxx>
Cc: Stanislav Kinsburskii <skinsburskii@xxxxxxxxxxxxxxxxxxx>
Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Tom Lendacky <thomas.lendacky@xxxxxxx>
Cc: Usama Arif <usama.arif@xxxxxxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/memblock.h | 16 +++++++++++++++-
mm/memblock.c | 32 ++++++++++++++++++++++++--------
2 files changed, 39 insertions(+), 9 deletions(-)
--- a/include/linux/memblock.h~memblock-add-memblock_rsrv_kern-flag
+++ a/include/linux/memblock.h
@@ -50,6 +50,7 @@ enum memblock_flags {
MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */
MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */
MEMBLOCK_RSRV_NOINIT = 0x10, /* don't initialize struct pages */
+ MEMBLOCK_RSRV_KERN = 0x20, /* memory reserved for kernel use */
};
/**
@@ -116,7 +117,19 @@ int memblock_add_node(phys_addr_t base,
int memblock_add(phys_addr_t base, phys_addr_t size);
int memblock_remove(phys_addr_t base, phys_addr_t size);
int memblock_phys_free(phys_addr_t base, phys_addr_t size);
-int memblock_reserve(phys_addr_t base, phys_addr_t size);
+int __memblock_reserve(phys_addr_t base, phys_addr_t size, int nid,
+ enum memblock_flags flags);
+
+static __always_inline int memblock_reserve(phys_addr_t base, phys_addr_t size)
+{
+ return __memblock_reserve(base, size, NUMA_NO_NODE, 0);
+}
+
+static __always_inline int memblock_reserve_kern(phys_addr_t base, phys_addr_t size)
+{
+ return __memblock_reserve(base, size, NUMA_NO_NODE, MEMBLOCK_RSRV_KERN);
+}
+
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
int memblock_physmem_add(phys_addr_t base, phys_addr_t size);
#endif
@@ -477,6 +490,7 @@ static inline __init_memblock bool membl
phys_addr_t memblock_phys_mem_size(void);
phys_addr_t memblock_reserved_size(void);
+phys_addr_t memblock_reserved_kern_size(int nid);
unsigned long memblock_estimated_nr_free_pages(void);
phys_addr_t memblock_start_of_DRAM(void);
phys_addr_t memblock_end_of_DRAM(void);
--- a/mm/memblock.c~memblock-add-memblock_rsrv_kern-flag
+++ a/mm/memblock.c
@@ -491,7 +491,7 @@ static int __init_memblock memblock_doub
* needn't do it
*/
if (!use_slab)
- BUG_ON(memblock_reserve(addr, new_alloc_size));
+ BUG_ON(memblock_reserve_kern(addr, new_alloc_size));
/* Update slab flag */
*in_slab = use_slab;
@@ -641,7 +641,7 @@ repeat:
#ifdef CONFIG_NUMA
WARN_ON(nid != memblock_get_region_node(rgn));
#endif
- WARN_ON(flags != rgn->flags);
+ WARN_ON(flags != MEMBLOCK_NONE && flags != rgn->flags);
nr_new++;
if (insert) {
if (start_rgn == -1)
@@ -901,14 +901,15 @@ int __init_memblock memblock_phys_free(p
return memblock_remove_range(&memblock.reserved, base, size);
}
-int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
+int __init_memblock __memblock_reserve(phys_addr_t base, phys_addr_t size,
+ int nid, enum memblock_flags flags)
{
phys_addr_t end = base + size - 1;
- memblock_dbg("%s: [%pa-%pa] %pS\n", __func__,
- &base, &end, (void *)_RET_IP_);
+ memblock_dbg("%s: [%pa-%pa] nid=%d flags=%x %pS\n", __func__,
+ &base, &end, nid, flags, (void *)_RET_IP_);
- return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0);
+ return memblock_add_range(&memblock.reserved, base, size, nid, flags);
}
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
@@ -1459,14 +1460,14 @@ phys_addr_t __init memblock_alloc_range_
again:
found = memblock_find_in_range_node(size, align, start, end, nid,
flags);
- if (found && !memblock_reserve(found, size))
+ if (found && !__memblock_reserve(found, size, nid, MEMBLOCK_RSRV_KERN))
goto done;
if (numa_valid_node(nid) && !exact_nid) {
found = memblock_find_in_range_node(size, align, start,
end, NUMA_NO_NODE,
flags);
- if (found && !memblock_reserve(found, size))
+ if (found && !memblock_reserve_kern(found, size))
goto done;
}
@@ -1751,6 +1752,20 @@ phys_addr_t __init_memblock memblock_res
return memblock.reserved.total_size;
}
+phys_addr_t __init_memblock memblock_reserved_kern_size(int nid)
+{
+ struct memblock_region *r;
+ phys_addr_t total = 0;
+
+ for_each_reserved_mem_region(r) {
+ if (nid == memblock_get_region_node(r) || !numa_valid_node(nid))
+ if (r->flags & MEMBLOCK_RSRV_KERN)
+ total += r->size;
+ }
+
+ return total;
+}
+
/**
* memblock_estimated_nr_free_pages - return estimated number of free pages
* from memblock point of view
@@ -2397,6 +2412,7 @@ static const char * const flagname[] = {
[ilog2(MEMBLOCK_NOMAP)] = "NOMAP",
[ilog2(MEMBLOCK_DRIVER_MANAGED)] = "DRV_MNG",
[ilog2(MEMBLOCK_RSRV_NOINIT)] = "RSV_NIT",
+ [ilog2(MEMBLOCK_RSRV_KERN)] = "RSV_KERN",
};
static int memblock_debug_show(struct seq_file *m, void *private)
_
Patches currently in -mm which might be from rppt@xxxxxxxxxx are
mm-mm_init-rename-init_reserved_page-to-init_deferred_page.patch
memblock-add-memblock_rsrv_kern-flag.patch
memblock-introduce-memmap_init_kho_scratch.patch
x86-setup-use-memblock_reserve_kern-for-memory-used-by-kernel.patch
documentation-kho-add-memblock-bindings.patch
