This is a note to let you know that I've just added the patch titled
ARM: 8636/1: Cleanup sanity_check_meminfo
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm-8636-1-cleanup-sanity_check_meminfo.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 374d446d25d6271ee615952a3b7f123ba4983c35 Mon Sep 17 00:00:00 2001
From: Laura Abbott <labbott@xxxxxxxxxx>
Date: Fri, 13 Jan 2017 22:51:08 +0100
Subject: ARM: 8636/1: Cleanup sanity_check_meminfo
From: Laura Abbott <labbott@xxxxxxxxxx>
commit 374d446d25d6271ee615952a3b7f123ba4983c35 upstream.
The logic for sanity_check_meminfo has become difficult to
follow. Clean up the code so it's more obvious what the code
is actually trying to do. Additionally, meminfo is now removed
so rename the function to better describe its purpose.
Tested-by: Magnus Lilja <lilja.magnus@xxxxxxxxx>
Reviewed-by: Nicolas Pitre <nico@xxxxxxxxxx>
Signed-off-by: Laura Abbott <lauraa@xxxxxxxxxxxxxx>
Signed-off-by: Laura Abbott <labbott@xxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kernel/setup.c | 4 +-
arch/arm/mm/mmu.c | 66 +++++++++++++++++-------------------------------
arch/arm/mm/nommu.c | 8 ++---
3 files changed, 30 insertions(+), 48 deletions(-)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -81,7 +81,7 @@ __setup("fpe=", fpe_setup);
extern void init_default_cache_policy(unsigned long);
extern void paging_init(const struct machine_desc *desc);
extern void early_paging_init(const struct machine_desc *);
-extern void sanity_check_meminfo(void);
+extern void adjust_lowmem_bounds(void);
extern enum reboot_mode reboot_mode;
extern void setup_dma_zone(const struct machine_desc *desc);
@@ -1093,7 +1093,7 @@ void __init setup_arch(char **cmdline_p)
setup_dma_zone(mdesc);
xen_early_init();
efi_init();
- sanity_check_meminfo();
+ adjust_lowmem_bounds();
arm_memblock_init(mdesc);
early_ioremap_reset();
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1152,13 +1152,11 @@ early_param("vmalloc", early_vmalloc);
phys_addr_t arm_lowmem_limit __initdata = 0;
-void __init sanity_check_meminfo(void)
+void __init adjust_lowmem_bounds(void)
{
phys_addr_t memblock_limit = 0;
- int highmem = 0;
u64 vmalloc_limit;
struct memblock_region *reg;
- bool should_use_highmem = false;
/*
* Let's use our own (unoptimized) equivalent of __pa() that is
@@ -1172,43 +1170,18 @@ void __init sanity_check_meminfo(void)
for_each_memblock(memory, reg) {
phys_addr_t block_start = reg->base;
phys_addr_t block_end = reg->base + reg->size;
- phys_addr_t size_limit = reg->size;
- if (reg->base >= vmalloc_limit)
- highmem = 1;
- else
- size_limit = vmalloc_limit - reg->base;
-
-
- if (!IS_ENABLED(CONFIG_HIGHMEM) || cache_is_vipt_aliasing()) {
-
- if (highmem) {
- pr_notice("Ignoring RAM at %pa-%pa (!CONFIG_HIGHMEM)\n",
- &block_start, &block_end);
- memblock_remove(reg->base, reg->size);
- should_use_highmem = true;
- continue;
- }
-
- if (reg->size > size_limit) {
- phys_addr_t overlap_size = reg->size - size_limit;
-
- pr_notice("Truncating RAM at %pa-%pa",
- &block_start, &block_end);
- block_end = vmalloc_limit;
- pr_cont(" to -%pa", &block_end);
- memblock_remove(vmalloc_limit, overlap_size);
- should_use_highmem = true;
- }
- }
-
- if (!highmem) {
- if (block_end > arm_lowmem_limit) {
- if (reg->size > size_limit)
- arm_lowmem_limit = vmalloc_limit;
- else
- arm_lowmem_limit = block_end;
- }
+ if (reg->base < vmalloc_limit) {
+ if (block_end > arm_lowmem_limit)
+ /*
+ * Compare as u64 to ensure vmalloc_limit does
+ * not get truncated. block_end should always
+ * fit in phys_addr_t so there should be no
+ * issue with assignment.
+ */
+ arm_lowmem_limit = min_t(u64,
+ vmalloc_limit,
+ block_end);
/*
* Find the first non-pmd-aligned page, and point
@@ -1233,9 +1206,6 @@ void __init sanity_check_meminfo(void)
}
}
- if (should_use_highmem)
- pr_notice("Consider using a HIGHMEM enabled kernel.\n");
-
high_memory = __va(arm_lowmem_limit - 1) + 1;
/*
@@ -1248,6 +1218,18 @@ void __init sanity_check_meminfo(void)
if (!memblock_limit)
memblock_limit = arm_lowmem_limit;
+ if (!IS_ENABLED(CONFIG_HIGHMEM) || cache_is_vipt_aliasing()) {
+ if (memblock_end_of_DRAM() > arm_lowmem_limit) {
+ phys_addr_t end = memblock_end_of_DRAM();
+
+ pr_notice("Ignoring RAM at %pa-%pa\n",
+ &memblock_limit, &end);
+ pr_notice("Consider using a HIGHMEM enabled kernel.\n");
+
+ memblock_remove(memblock_limit, end - memblock_limit);
+ }
+ }
+
memblock_set_current_limit(memblock_limit);
}
--- a/arch/arm/mm/nommu.c
+++ b/arch/arm/mm/nommu.c
@@ -85,7 +85,7 @@ static unsigned long irbar_read(void)
}
/* MPU initialisation functions */
-void __init sanity_check_meminfo_mpu(void)
+void __init adjust_lowmem_bounds_mpu(void)
{
phys_addr_t phys_offset = PHYS_OFFSET;
phys_addr_t aligned_region_size, specified_mem_size, rounded_mem_size;
@@ -274,7 +274,7 @@ void __init mpu_setup(void)
}
}
#else
-static void sanity_check_meminfo_mpu(void) {}
+static void adjust_lowmem_bounds_mpu(void) {}
static void __init mpu_setup(void) {}
#endif /* CONFIG_ARM_MPU */
@@ -295,10 +295,10 @@ void __init arm_mm_memblock_reserve(void
#endif
}
-void __init sanity_check_meminfo(void)
+void __init adjust_lowmem_bounds(void)
{
phys_addr_t end;
- sanity_check_meminfo_mpu();
+ adjust_lowmem_bounds_mpu();
end = memblock_end_of_DRAM();
high_memory = __va(end - 1) + 1;
memblock_set_current_limit(end);
Patches currently in stable-queue which might be from labbott@xxxxxxxxxx are
queue-4.9/arm-8636-1-cleanup-sanity_check_meminfo.patch
queue-4.9/arm-8637-1-adjust-memory-boundaries-after-reservations.patch