linux-kernel - [PATCH v2] x86/crash: Update the stale comment in reserve

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Message-Id: <1485154103-18426-1-git-send-email-xlpang@redhat.com>
Date:   Mon, 23 Jan 2017 14:48:23 +0800
From:   Xunlei Pang <xlpang@...hat.com>
To:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org
Cc:     x86@...nel.org, Ingo Molnar <mingo@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Young <dyoung@...hat.com>,
        Xunlei Pang <xlpang@...hat.com>,
        Robert LeBlanc <robert@...lancnet.us>,
        Baoquan He <bhe@...hat.com>
Subject: [PATCH v2] x86/crash: Update the stale comment in reserve_crashkernel()

CRASH_KERNEL_ADDR_MAX has been missing for a long time,
update it with more detailed explanation.

Cc: Robert LeBlanc <robert@...lancnet.us>
Cc: Baoquan He <bhe@...hat.com>
Signed-off-by: Xunlei Pang <xlpang@...hat.com>
---
 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..c32a167 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
-- 
1.8.3.1