arm64/mm: Define defer_reserve_crashkernel()

Crash kernel memory reservation gets deferred, when either CONFIG_ZONE_DMA
or CONFIG_ZONE_DMA32 config is enabled on the platform. This deferral also
impacts overall linear mapping creation including the crash kernel itself.
Just encapsulate this deferral check in a new helper for better clarity.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/20220705062556.1845734-1-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 0af70d9..b09b300 100644 (file)
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -351,6 +351,11 @@ 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/init.c b/arch/arm64/mm/init.c
index 339ee84..b6ef26f 100644 (file)
--- a/arch/arm64/mm/init.c
+++ b/arch/arm64/mm/init.c
@@ -389,7 +389,7 @@ void __init arm64_memblock_init(void)
 
        early_init_fdt_scan_reserved_mem();
 
-       if (!IS_ENABLED(CONFIG_ZONE_DMA) && !IS_ENABLED(CONFIG_ZONE_DMA32))
+       if (!defer_reserve_crashkernel())
                reserve_crashkernel();
 
        high_memory = __va(memblock_end_of_DRAM() - 1) + 1;
@@ -438,7 +438,7 @@ void __init bootmem_init(void)
         * request_standard_resources() depends on crashkernel's memory being
         * reserved, so do it here.
         */
-       if (IS_ENABLED(CONFIG_ZONE_DMA) || IS_ENABLED(CONFIG_ZONE_DMA32))
+       if (defer_reserve_crashkernel())
                reserve_crashkernel();
 
        memblock_dump_all();

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 626ec32..03f0572 100644 (file)
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -529,8 +529,7 @@ static void __init map_mem(pgd_t *pgdp)
 
 #ifdef CONFIG_KEXEC_CORE
        if (crash_mem_map) {
-               if (IS_ENABLED(CONFIG_ZONE_DMA) ||
-                   IS_ENABLED(CONFIG_ZONE_DMA32))
+               if (defer_reserve_crashkernel())
                        flags |= NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
                else if (crashk_res.end)
                        memblock_mark_nomap(crashk_res.start,
@@ -571,8 +570,7 @@ static void __init map_mem(pgd_t *pgdp)
         * through /sys/kernel/kexec_crash_size interface.
         */
 #ifdef CONFIG_KEXEC_CORE
-       if (crash_mem_map &&
-           !IS_ENABLED(CONFIG_ZONE_DMA) && !IS_ENABLED(CONFIG_ZONE_DMA32)) {
+       if (crash_mem_map && !defer_reserve_crashkernel()) {
                if (crashk_res.end) {
                        __map_memblock(pgdp, crashk_res.start,
                                       crashk_res.end + 1,