[PATCH v4 3/4] kexec_file: Don't place kexec images on IORESOURCE_MEM_DRIVER_MANAGED

Memory flagged with IORESOURCE_MEM_DRIVER_MANAGED is special - it won't be part of the initial memmap of the kexec kernel and not all memory might be accessible. Don't place any kexec images onto it. Cc: Andrew Morton <akpm(a)linux-foundation.org&gt; Cc: Michal Hocko <mhocko(a)suse.com&gt; Cc: Pankaj Gupta <pankaj.gupta.linux(a)gmail.com&gt; Cc: Wei Yang <richard.weiyang(a)gmail.com&gt; Cc: Baoquan He <bhe(a)redhat.com&gt; Cc: Dave Hansen <dave.hansen(a)linux.intel.com&gt; Cc: Eric Biederman <ebiederm(a)xmission.com&gt; Cc: Pavel Tatashin <pasha.tatashin(a)soleen.com&gt; Cc: Dan Williams <dan.j.williams(a)intel.com&gt; Signed-off-by: David Hildenbrand <david(a)redhat.com&gt; --- kernel/kexec_file.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index faa74d5f6941..bb05fd52de85 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -540,6 +540,11 @@ static int locate_mem_hole_callback(struct resource *res, void *arg) unsigned long sz = end - start + 1; /* Returning 0 will take to next memory range */ + + /* Don't use memory that will be detected and handled by a driver. */ + if (res->flags & IORESOURCE_MEM_DRIVER_MANAGED) + return 0; + if (sz < kbuf->memsz) return 0; -- 2.25.4