Commit-ID: fe2d48b805d01e14ddb8144de01de43171eb516f
Gitweb: http://git.kernel.org/tip/fe2d48b805d01e14ddb8144de01de43171eb516f
Author: Jiri Bohac <jbo...@suse.cz>
AuthorDate: Fri, 16 Jun 2017 18:16:02 +0200
Committer: Ingo Molnar <mi...@kernel.org>
CommitDate: Thu, 22 Jun 2017 11:10:23 +0200
x86/debug: Extend the lower bound of crash kernel low reservations
The following change in 2013:
0212f9159694 ("x86: Add Crash kernel low reservation")
... introduced reserve_crashkernel_low(). This function is used to
reserve crash kernel memory either if crashkernel=size,low is given
on the command line or if the region reserved by reserve_crashkernel
is entirely above 4G.
reserve_crashkernel_low() tries to find a block of 'low_size' bytes.
But there seems to be no good reason to restrict the lower bound
of the range to 'low_size'.
Make memblock_find_in_range() search from the start of memory.
Signed-off-by: Jiri Bohac <jbo...@suse.cz>
Cc: Eric Biederman <ebied...@xmission.com>
Cc: H. Peter Anvin <h...@zytor.com>
Cc: Kees Cook <keesc...@chromium.org>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Yinghai Lu <ying...@kernel.org>
Link: http://lkml.kernel.org/r/20170616161602.2r7birrf2y3yl...@dwarf.suse.cz
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
arch/x86/kernel/setup.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0b4d3c6..848d048 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -503,7 +503,7 @@ static int __init reserve_crashkernel_low(void)
return 0;
}
- low_base = memblock_find_in_range(low_size, 1ULL << 32, low_size,
CRASH_ALIGN);
+ low_base = memblock_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
if (!low_base) {
pr_err("Cannot reserve %ldMB crashkernel low memory, please try
smaller size.\n",
(unsigned long)(low_size >> 20));
