The patch titled
Subject: s390: query dynamic DEBUG_PAGEALLOC setting
has been added to the -mm tree. Its filename is
s390-query-dynamic-debug_pagealloc-setting.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/s390-query-dynamic-debug_pagealloc-setting.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/s390-query-dynamic-debug_pagealloc-setting.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Subject: s390: query dynamic DEBUG_PAGEALLOC setting
We can use debug_pagealloc_enabled() to check if we can map the identity
mapping with 1MB/2GB pages as well as to print the current setting in
dump_stack.
Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Reviewed-by: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/dumpstack.c | 6 +++---
arch/s390/mm/vmem.c | 10 ++++------
2 files changed, 7 insertions(+), 9 deletions(-)
diff -puN arch/s390/kernel/dumpstack.c~s390-query-dynamic-debug_pagealloc-setting arch/s390/kernel/dumpstack.c
--- a/arch/s390/kernel/dumpstack.c~s390-query-dynamic-debug_pagealloc-setting
+++ a/arch/s390/kernel/dumpstack.c
@@ -11,6 +11,7 @@
#include <linux/export.h>
#include <linux/kdebug.h>
#include <linux/ptrace.h>
+#include <linux/mm.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/processor.h>
@@ -184,9 +185,8 @@ void die(struct pt_regs *regs, const cha
#ifdef CONFIG_SMP
printk("SMP ");
#endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
- printk("DEBUG_PAGEALLOC");
-#endif
+ if (debug_pagealloc_enabled())
+ printk("DEBUG_PAGEALLOC");
printk("\n");
notify_die(DIE_OOPS, str, regs, 0, regs->int_code & 0xffff, SIGSEGV);
print_modules();
diff -puN arch/s390/mm/vmem.c~s390-query-dynamic-debug_pagealloc-setting arch/s390/mm/vmem.c
--- a/arch/s390/mm/vmem.c~s390-query-dynamic-debug_pagealloc-setting
+++ a/arch/s390/mm/vmem.c
@@ -94,16 +94,15 @@ static int vmem_add_mem(unsigned long st
pgd_populate(&init_mm, pg_dir, pu_dir);
}
pu_dir = pud_offset(pg_dir, address);
-#ifndef CONFIG_DEBUG_PAGEALLOC
if (MACHINE_HAS_EDAT2 && pud_none(*pu_dir) && address &&
- !(address & ~PUD_MASK) && (address + PUD_SIZE <= end)) {
+ !(address & ~PUD_MASK) && (address + PUD_SIZE <= end) &&
+ !debug_pagealloc_enabled()) {
pud_val(*pu_dir) = __pa(address) |
_REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE |
(ro ? _REGION_ENTRY_PROTECT : 0);
address += PUD_SIZE;
continue;
}
-#endif
if (pud_none(*pu_dir)) {
pm_dir = vmem_pmd_alloc();
if (!pm_dir)
@@ -111,9 +110,9 @@ static int vmem_add_mem(unsigned long st
pud_populate(&init_mm, pu_dir, pm_dir);
}
pm_dir = pmd_offset(pu_dir, address);
-#ifndef CONFIG_DEBUG_PAGEALLOC
if (MACHINE_HAS_EDAT1 && pmd_none(*pm_dir) && address &&
- !(address & ~PMD_MASK) && (address + PMD_SIZE <= end)) {
+ !(address & ~PMD_MASK) && (address + PMD_SIZE <= end) &&
+ !debug_pagealloc_enabled()) {
pmd_val(*pm_dir) = __pa(address) |
_SEGMENT_ENTRY | _SEGMENT_ENTRY_LARGE |
_SEGMENT_ENTRY_YOUNG |
@@ -121,7 +120,6 @@ static int vmem_add_mem(unsigned long st
address += PMD_SIZE;
continue;
}
-#endif
if (pmd_none(*pm_dir)) {
pt_dir = vmem_pte_alloc(address);
if (!pt_dir)
_
Patches currently in -mm which might be from borntraeger@xxxxxxxxxx are
mm-debug_pagealloc-ask-users-for-default-setting-of-debug_pagealloc.patch
mm-debug_pagealloc-ask-users-for-default-setting-of-debug_pagealloc-v3.patch
x86-query-dynamic-debug_pagealloc-setting.patch
s390-query-dynamic-debug_pagealloc-setting.patch
x86-also-use-debug_pagealloc_enabled-for-free_init_pages.patch
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