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authorJiri Bohac <[email protected]>2017-06-16 18:16:02 +0200
committerIngo Molnar <[email protected]>2017-06-22 11:10:23 +0200
commitfe2d48b805d01e14ddb8144de01de43171eb516f (patch)
treebef095f9ee6090a0423ca058b78bddcb806d54b5
parent28be1b454c2bb60e317b3135211a378fa2718886 (diff)
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 <[email protected]> Cc: Eric Biederman <[email protected]> Cc: H. Peter Anvin <[email protected]> Cc: Kees Cook <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: Yinghai Lu <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>
-rw-r--r--arch/x86/kernel/setup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 0b4d3c686b1e..848d0489ad00 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));