[tip:x86/debug] x86/crash: Update the stale comment in reserve_crashkernel()
From: tip-bot for Xunlei Pang
Date: Mon Jan 23 2017 - 03:03:08 EST
Commit-ID: a8d4c8246b290ce97f88752d833804843041ac84
Gitweb: http://git.kernel.org/tip/a8d4c8246b290ce97f88752d833804843041ac84
Author: Xunlei Pang <xlpang@xxxxxxxxxx>
AuthorDate: Mon, 23 Jan 2017 14:48:23 +0800
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Mon, 23 Jan 2017 08:57:55 +0100
x86/crash: Update the stale comment in reserve_crashkernel()
CRASH_KERNEL_ADDR_MAX has been missing for a long time,
update it with a more detailed explanation.
Signed-off-by: Xunlei Pang <xlpang@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Robert LeBlanc <robert@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: kexec@xxxxxxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/1485154103-18426-1-git-send-email-xlpang@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/kernel/setup.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 4cfba94..eb69b14 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -575,7 +575,9 @@ static void __init reserve_crashkernel(void)
/* 0 means: find the address automatically */
if (crash_base <= 0) {
/*
- * kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
+ * Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
+ * as old kexec-tools loads bzImage below that, unless
+ * "crashkernel=size[KMG],high" is specified.
*/
crash_base = memblock_find_in_range(CRASH_ALIGN,
high ? CRASH_ADDR_HIGH_MAX