Revert "mm: kmemleak: alloc gray object for reserved region with direct map"

This reverts commit 972fa3a7c17c9d60212e32ecc0205dc585b1e769.

Kmemleak operates by periodically scanning memory regions for pointers to
allocated memory blocks to determine if they are leaked or not.  However,
reserved memory regions can be used for DMA transactions between a device
and a CPU, and thus, wouldn't contain pointers to allocated memory blocks,
making them inappropriate for kmemleak to scan.  Thus, revert this commit.

Link: https://lkml.kernel.org/r/20230124230254.295589-1-isaacmanjarres@google.com
Fixes: 972fa3a7c17c9 ("mm: kmemleak: alloc gray object for reserved region with direct map")
Signed-off-by: Isaac J. Manjarres <isaacmanjarres@google.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: Calvin Zhang <calvinzhang.cool@gmail.com>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>
Cc: <stable@vger.kernel.org>	[5.17+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index f08b25195ae79d2b51468dd89d6d3e3c20b93f2d..d1a68b6d03b3f1df3789511a432b92ca15911e2a 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -26,7 +26,6 @@
 #include <linux/serial_core.h>
 #include <linux/sysfs.h>
 #include <linux/random.h>
-#include <linux/kmemleak.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #include <asm/page.h>
@@ -525,12 +524,9 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
                size = dt_mem_next_cell(dt_root_size_cells, &prop);
 
                if (size &&
-                   early_init_dt_reserve_memory(base, size, nomap) == 0) {
+                   early_init_dt_reserve_memory(base, size, nomap) == 0)
                        pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %lu MiB\n",
                                uname, &base, (unsigned long)(size / SZ_1M));
-                       if (!nomap)
-                               kmemleak_alloc_phys(base, size, 0);
-               }
                else
                        pr_err("Reserved memory: failed to reserve memory for node '%s': base %pa, size %lu MiB\n",
                               uname, &base, (unsigned long)(size / SZ_1M));