linux-kernel - [PATCH v4 1/2] Revert "powerpc: Set max

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Date:   Wed, 16 Feb 2022 20:11:07 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     <linuxppc-dev@...ts.ozlabs.org>, <mpe@...erman.id.au>,
        <benh@...nel.crashing.or>, <paulus@...ba.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>
CC:     <akpm@...ux-foundation.org>, <npiggin@...il.com>,
        <christophe.leroy@...roup.eu>, <songyuanzheng@...wei.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH v4 1/2] Revert "powerpc: Set max_mapnr correctly"

This reverts commit 602946ec2f90d5bd965857753880db29d2d9a1e9.

If CONFIG_HIGHMEM enabled, highmem will be disappeared with max_mapnr
set to max_low_pfn, see mem_init(), 

  for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
        ...
	free_highmem_page();
  }

Revert it and will fix virt_addr_valid() check in the next patch.

Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Fixes: 602946ec2f90 ("powerpc: Set max_mapnr correctly")
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
v4:
- new patch
 arch/powerpc/mm/mem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 8e301cd8925b..4d221d033804 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -255,7 +255,7 @@ void __init mem_init(void)
 #endif
 
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
-	set_max_mapnr(max_low_pfn);
+	set_max_mapnr(max_pfn);
 
 	kasan_late_init();
 
-- 
2.26.2