x86: enable memory tester support on 32-bit

only supports memory below max_low_pfn.

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

3 files changed, 4 insertions, 2 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 09ad7450647b..70624ddd1df3 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1206,7 +1206,7 @@ and is between 256 and 4096 characters. It is defined in the file
                                  or
                                  memmap=0x10000$0x18690000
 
-        memtest=        [KNL,X86_64] Enable memtest
+        memtest=        [KNL,X86] Enable memtest
                         Format: <integer>
                         range: 0,4 : pattern number
                         default : 0 <disable>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 96e0c2ebc388..03980cb04291 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -447,7 +447,6 @@ config PARAVIRT_DEBUG
 
 config MEMTEST
         bool "Memtest"
-        depends on X86_64
         help
           This option adds a kernel parameter 'memtest', which allows memtest
           to be set.
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 9689a5138e64..3eeab6d0065f 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -844,6 +844,9 @@ unsigned long __init_refok init_memory_mapping(unsigned long start,
                 reserve_early(table_start << PAGE_SHIFT,
                                  table_end << PAGE_SHIFT, "PGTABLE");
 
+        if (!after_init_bootmem)
+                early_memtest(start, end);
+
         return end >> PAGE_SHIFT;
 }