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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 <bhe@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Baoquan He 2014-10-13 15:53:42 -07:00 committed by Linus Torvalds
parent 669280a152
commit a2d6aa8fa0
1 changed files with 6 additions and 4 deletions
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10
arch/x86/kernel/crash.c
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@ -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) {