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Date: Wed, 6 May 2020 17:41:46 -0700 From: Anthony Yznaga <anthony.yznaga@...cle.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: willy@...radead.org, corbet@....net, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com, dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org, rppt@...ux.ibm.com, akpm@...ux-foundation.org, hughd@...gle.com, ebiederm@...ssion.com, masahiroy@...nel.org, ardb@...nel.org, ndesaulniers@...gle.com, dima@...ovin.in, daniel.kiper@...cle.com, nivedita@...m.mit.edu, rafael.j.wysocki@...el.com, dan.j.williams@...el.com, zhenzhong.duan@...cle.com, jroedel@...e.de, bhe@...hat.com, guro@...com, Thomas.Lendacky@....com, andriy.shevchenko@...ux.intel.com, keescook@...omium.org, hannes@...xchg.org, minchan@...nel.org, mhocko@...nel.org, ying.huang@...el.com, yang.shi@...ux.alibaba.com, gustavo@...eddedor.com, ziqian.lzq@...fin.com, vdavydov.dev@...il.com, jason.zeng@...el.com, kevin.tian@...el.com, zhiyuan.lv@...el.com, lei.l.li@...el.com, paul.c.lai@...el.com, ashok.raj@...el.com, linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org, kexec@...ts.infradead.org Subject: [RFC 20/43] PKRAM: disable feature when running the kdump kernel The kdump kernel should not preserve or restore pages. Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com> --- mm/pkram.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/pkram.c b/mm/pkram.c index 95e691382721..4d4d836fea53 100644 --- a/mm/pkram.c +++ b/mm/pkram.c @@ -1,4 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 +#include <linux/crash_dump.h> #include <linux/err.h> #include <linux/gfp.h> #include <linux/highmem.h> @@ -193,7 +194,7 @@ void __init pkram_reserve(void) { int err = 0; - if (!pkram_sb_pfn) + if (!pkram_sb_pfn || is_kdump_kernel()) return; pr_info("PKRAM: Examining preserved memory...\n"); @@ -305,6 +306,9 @@ static void pkram_show_banned(void) int i; unsigned long n, total = 0; + if (is_kdump_kernel()) + return; + pr_info("PKRAM: banned regions:\n"); for (i = 0; i < nr_banned; i++) { n = banned[i].end - banned[i].start + 1; @@ -1223,7 +1227,7 @@ static int __init pkram_init_sb(void) static int __init pkram_init(void) { - if (pkram_init_sb()) { + if (!is_kdump_kernel() && pkram_init_sb()) { register_reboot_notifier(&pkram_reboot_notifier); register_shrinker(&banned_pages_shrinker); sysfs_update_group(kernel_kobj, &pkram_attr_group); -- 2.13.3
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