linux-kernel - [PATCH 2/2] arm64: remove unneed defer_reserve_crashkernel() and crash_mem

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Date:   Sun, 28 Aug 2022 08:55:45 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        ardb@...nel.org, rppt@...nel.org, guanghuifeng@...ux.alibaba.com,
        mark.rutland@....com, will@...nel.org, linux-mm@...ck.org,
        thunder.leizhen@...wei.com, wangkefeng.wang@...wei.com,
        kexec@...ts.infradead.org, Baoquan He <bhe@...hat.com>
Subject: [PATCH 2/2] arm64: remove unneed defer_reserve_crashkernel() and crash_mem_map

Now they are not needed any more, clean them up.

Signed-off-by: Baoquan He <bhe@...hat.com>
---
 arch/arm64/include/asm/memory.h |  5 -----
 arch/arm64/mm/mmu.c             | 15 ---------------
 2 files changed, 20 deletions(-)

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 9dd08cd339c3..b9e71583c9cb 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -363,11 +363,6 @@ static inline void *phys_to_virt(phys_addr_t x)
 })
 
 void dump_mem_limit(void);
-
-static inline bool defer_reserve_crashkernel(void)
-{
-	return IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32);
-}
 #endif /* !ASSEMBLY */
 
 /*
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index cdd338fa2115..c3f8f426c3d8 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -502,21 +502,6 @@ void __init mark_linear_text_alias_ro(void)
 			    PAGE_KERNEL_RO);
 }
 
-static bool crash_mem_map __initdata;
-
-static int __init enable_crash_mem_map(char *arg)
-{
-	/*
-	 * Proper parameter parsing is done by reserve_crashkernel(). We only
-	 * need to know if the linear map has to avoid block mappings so that
-	 * the crashkernel reservations can be unmapped later.
-	 */
-	crash_mem_map = true;
-
-	return 0;
-}
-early_param("crashkernel", enable_crash_mem_map);
-
 static void __init map_mem(pgd_t *pgdp)
 {
 	static const u64 direct_map_end = _PAGE_END(VA_BITS_MIN);
-- 
2.34.1