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[v3,5/5] ARM64: kasan: print memory assignment

Message ID 1437561037-31995-6-git-send-email-a.ryabinin@samsung.com (mailing list archive)
State New, archived
Headers show

Commit Message

Andrey Ryabinin July 22, 2015, 10:30 a.m. UTC 
From: Linus Walleij <linus.walleij@linaro.org>

This prints out the virtual memory assigned to KASan in the
boot crawl along with other memory assignments, if and only
if KASan is activated.

Example dmesg from the Juno Development board:

Memory: 1691156K/2080768K available (5465K kernel code, 444K rwdata,
2160K rodata, 340K init, 217K bss, 373228K reserved, 16384K cma-reserved)
Virtual kernel memory layout:
    kasan   : 0xffffff8000000000 - 0xffffff9000000000   (    64 GB)
    vmalloc : 0xffffff9000000000 - 0xffffffbdbfff0000   (   182 GB)
    vmemmap : 0xffffffbdc0000000 - 0xffffffbfc0000000   (     8 GB maximum)
              0xffffffbdc2000000 - 0xffffffbdc3fc0000   (    31 MB actual)
    fixed   : 0xffffffbffabfd000 - 0xffffffbffac00000   (    12 KB)
    PCI I/O : 0xffffffbffae00000 - 0xffffffbffbe00000   (    16 MB)
    modules : 0xffffffbffc000000 - 0xffffffc000000000   (    64 MB)
    memory  : 0xffffffc000000000 - 0xffffffc07f000000   (  2032 MB)
      .init : 0xffffffc0007f5000 - 0xffffffc00084a000   (   340 KB)
      .text : 0xffffffc000080000 - 0xffffffc0007f45b4   (  7634 KB)
      .data : 0xffffffc000850000 - 0xffffffc0008bf200   (   445 KB)

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
---
 arch/arm64/mm/init.c | 6 ++++++
 1 file changed, 6 insertions(+)

Comments

Catalin Marinas July 22, 2015, 2:24 p.m. UTC | #1 
On Wed, Jul 22, 2015 at 01:30:37PM +0300, Andrey Ryabinin wrote:
> From: Linus Walleij <linus.walleij@linaro.org>
> 
> This prints out the virtual memory assigned to KASan in the
> boot crawl along with other memory assignments, if and only
> if KASan is activated.
> 
> Example dmesg from the Juno Development board:
> 
> Memory: 1691156K/2080768K available (5465K kernel code, 444K rwdata,
> 2160K rodata, 340K init, 217K bss, 373228K reserved, 16384K cma-reserved)
> Virtual kernel memory layout:
>     kasan   : 0xffffff8000000000 - 0xffffff9000000000   (    64 GB)
>     vmalloc : 0xffffff9000000000 - 0xffffffbdbfff0000   (   182 GB)
>     vmemmap : 0xffffffbdc0000000 - 0xffffffbfc0000000   (     8 GB maximum)
>               0xffffffbdc2000000 - 0xffffffbdc3fc0000   (    31 MB actual)
>     fixed   : 0xffffffbffabfd000 - 0xffffffbffac00000   (    12 KB)
>     PCI I/O : 0xffffffbffae00000 - 0xffffffbffbe00000   (    16 MB)
>     modules : 0xffffffbffc000000 - 0xffffffc000000000   (    64 MB)
>     memory  : 0xffffffc000000000 - 0xffffffc07f000000   (  2032 MB)
>       .init : 0xffffffc0007f5000 - 0xffffffc00084a000   (   340 KB)
>       .text : 0xffffffc000080000 - 0xffffffc0007f45b4   (  7634 KB)
>       .data : 0xffffffc000850000 - 0xffffffc0008bf200   (   445 KB)
> 
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>
diff mbox

Patch

diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c
index ad87ce8..3930692 100644
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -298,6 +298,9 @@  void __init mem_init(void)
 #define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), SZ_1K)
 
 	pr_notice("Virtual kernel memory layout:\n"
+#ifdef CONFIG_KASAN
+		  "    kasan   : 0x%16lx - 0x%16lx   (%6ld GB)\n"
+#endif
 		  "    vmalloc : 0x%16lx - 0x%16lx   (%6ld GB)\n"
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 		  "    vmemmap : 0x%16lx - 0x%16lx   (%6ld GB maximum)\n"
@@ -310,6 +313,9 @@  void __init mem_init(void)
 		  "      .init : 0x%p" " - 0x%p" "   (%6ld KB)\n"
 		  "      .text : 0x%p" " - 0x%p" "   (%6ld KB)\n"
 		  "      .data : 0x%p" " - 0x%p" "   (%6ld KB)\n",
+#ifdef CONFIG_KASAN
+		  MLG(KASAN_SHADOW_START, KASAN_SHADOW_END),
+#endif
 		  MLG(VMALLOC_START, VMALLOC_END),
 #ifdef CONFIG_SPARSEMEM_VMEMMAP
 		  MLG((unsigned long)vmemmap,