From a2d6aa8fa0750fe1d2fc9673d4a46b2fd87e44b3 Mon Sep 17 00:00:00 2001 From: Baoquan He Date: Mon, 13 Oct 2014 15:53:42 -0700 Subject: [PATCH] kexec: check if crashk_res_low exists when exclude it from crash mem ranges Add a check if crashk_res_low exists just like GART region does. If crashk_res_low doesn't exist, calling exclude_mem_range is unnecessary. Meanwhile, since crashk_res_low has been initialized at definition, it's safe just use "if (crashk_low_res.end)" to check if it's exist. And this can make it consistent with other places of check. Signed-off-by: Baoquan He Acked-by: Vivek Goyal Cc: Eric W. Biederman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/x86/kernel/crash.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c index a618fcd..f5ab56d 100644 --- a/arch/x86/kernel/crash.c +++ b/arch/x86/kernel/crash.c @@ -237,7 +237,7 @@ static void fill_up_crash_elf_data(struct crash_elf_data *ced, ced->max_nr_ranges++; /* If crashk_low_res is not 0, another range split possible */ - if (crashk_low_res.end != 0) + if (crashk_low_res.end) ced->max_nr_ranges++; } @@ -335,9 +335,11 @@ static int elf_header_exclude_ranges(struct crash_elf_data *ced, if (ret) return ret; - ret = exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end); - if (ret) - return ret; + if (crashk_low_res.end) { + ret = exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end); + if (ret) + return ret; + } /* Exclude GART region */ if (ced->gart_end) { -- 2.7.4