diff options
| author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2018-10-26 15:04:48 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-26 16:25:20 -0700 |
| commit | 6072cf567a2be7f13fb3522156409ca0e7a27ff9 (patch) | |
| tree | 80abf475343d7c56dbaeff675fb13417ff24da35 /drivers | |
| parent | 426dcd4b600f72d9f797eae385d85af4128589cc (diff) | |
of: ignore sub-page memory regions
Memory region size is rounded down to page boundary and with sub-page
region it becomes 0 and there is no point to add an empty region.
Moreover, when the base is less than PAGE_SIZE we get a bogus size as
(base + size - 1) evaluates to -1.
8cccffc52694 ("of: check for size < 0 after rounding in
early_init_dt_add_memory_arch") introduced a test for wrap around for the
case when base is not page aligned, the same test can be used to ignore
sub-page region sizes.
Link: http://lkml.kernel.org/r/1533326330-31677-3-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/of/fdt.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 800ad252cf9c..76c83c1ffeda 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -1127,12 +1127,13 @@ void __init __weak early_init_dt_add_memory_arch(u64 base, u64 size) { const u64 phys_offset = MIN_MEMBLOCK_ADDR; + if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { + pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", + base, base + size); + return; + } + if (!PAGE_ALIGNED(base)) { - if (size < PAGE_SIZE - (base & ~PAGE_MASK)) { - pr_warn("Ignoring memory block 0x%llx - 0x%llx\n", - base, base + size); - return; - } size -= PAGE_SIZE - (base & ~PAGE_MASK); base = PAGE_ALIGN(base); } |