powerpc: query dynamic DEBUG_PAGEALLOC setting

We can disable debug_pagealloc processing even if the code is compiled
with CONFIG_DEBUG_PAGEALLOC.  This patch changes the code to query
whether it is enabled or not in runtime.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christoph Lameter <cl@linux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index b6becc7..33c47fc 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -203,9 +203,8 @@ static int __kprobes __die(const char *str, struct pt_regs *regs, long err)
 #ifdef CONFIG_SMP
        printk("SMP NR_CPUS=%d ", NR_CPUS);
 #endif
-#ifdef CONFIG_DEBUG_PAGEALLOC
-       printk("DEBUG_PAGEALLOC ");
-#endif
+       if (debug_pagealloc_enabled())
+               printk("DEBUG_PAGEALLOC ");
 #ifdef CONFIG_NUMA
        printk("NUMA ");
 #endif

diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index ba59d59..1005281 100644 (file)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -255,8 +255,10 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
 
                if (ret < 0)
                        break;
+
 #ifdef CONFIG_DEBUG_PAGEALLOC
-               if ((paddr >> PAGE_SHIFT) < linear_map_hash_count)
+               if (debug_pagealloc_enabled() &&
+                       (paddr >> PAGE_SHIFT) < linear_map_hash_count)
                        linear_map_hash_slots[paddr >> PAGE_SHIFT] = ret | 0x80;
 #endif /* CONFIG_DEBUG_PAGEALLOC */
        }
@@ -512,17 +514,17 @@ static void __init htab_init_page_sizes(void)
        if (mmu_has_feature(MMU_FTR_16M_PAGE))
                memcpy(mmu_psize_defs, mmu_psize_defaults_gp,
                       sizeof(mmu_psize_defaults_gp));
- found:
-#ifndef CONFIG_DEBUG_PAGEALLOC
-       /*
-        * Pick a size for the linear mapping. Currently, we only support
-        * 16M, 1M and 4K which is the default
-        */
-       if (mmu_psize_defs[MMU_PAGE_16M].shift)
-               mmu_linear_psize = MMU_PAGE_16M;
-       else if (mmu_psize_defs[MMU_PAGE_1M].shift)
-               mmu_linear_psize = MMU_PAGE_1M;
-#endif /* CONFIG_DEBUG_PAGEALLOC */
+found:
+       if (!debug_pagealloc_enabled()) {
+               /*
+                * Pick a size for the linear mapping. Currently, we only
+                * support 16M, 1M and 4K which is the default
+                */
+               if (mmu_psize_defs[MMU_PAGE_16M].shift)
+                       mmu_linear_psize = MMU_PAGE_16M;
+               else if (mmu_psize_defs[MMU_PAGE_1M].shift)
+                       mmu_linear_psize = MMU_PAGE_1M;
+       }
 
 #ifdef CONFIG_PPC_64K_PAGES
        /*
@@ -721,10 +723,12 @@ static void __init htab_initialize(void)
        prot = pgprot_val(PAGE_KERNEL);
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
-       linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
-       linear_map_hash_slots = __va(memblock_alloc_base(linear_map_hash_count,
-                                                   1, ppc64_rma_size));
-       memset(linear_map_hash_slots, 0, linear_map_hash_count);
+       if (debug_pagealloc_enabled()) {
+               linear_map_hash_count = memblock_end_of_DRAM() >> PAGE_SHIFT;
+               linear_map_hash_slots = __va(memblock_alloc_base(
+                               linear_map_hash_count, 1, ppc64_rma_size));
+               memset(linear_map_hash_slots, 0, linear_map_hash_count);
+       }
 #endif /* CONFIG_DEBUG_PAGEALLOC */
 
        /* On U3 based machines, we need to reserve the DART area and

diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index a10be66..c2b7716 100644 (file)
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -112,10 +112,10 @@ void __init MMU_setup(void)
        if (strstr(boot_command_line, "noltlbs")) {
                __map_without_ltlbs = 1;
        }
-#ifdef CONFIG_DEBUG_PAGEALLOC
-       __map_without_bats = 1;
-       __map_without_ltlbs = 1;
-#endif
+       if (debug_pagealloc_enabled()) {
+               __map_without_bats = 1;
+               __map_without_ltlbs = 1;
+       }
 }
 
 /*