linux-kernel - [PATCH 06/15] powerpc: fadamp: simplify fadump_reserve_crash

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Date:   Tue, 28 Jul 2020 08:11:44 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christoph Hellwig <hch@....de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Simek <monstr@...str.eu>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Mike Rapoport <rppt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Russell King <linux@...linux.org.uk>,
        Stafford Horne <shorne@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        clang-built-linux@...glegroups.com,
        iommu@...ts.linux-foundation.org,
        linux-arm-kernel@...ts.infradead.org, linux-c6x-dev@...ux-c6x.org,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, linuxppc-dev@...ts.ozlabs.org,
        openrisc@...ts.librecores.org, sparclinux@...r.kernel.org,
        uclinux-h8-devel@...ts.sourceforge.jp, x86@...nel.org
Subject: [PATCH 06/15] powerpc: fadamp: simplify fadump_reserve_crash_area()

From: Mike Rapoport <rppt@...ux.ibm.com>

fadump_reserve_crash_area() reserves memory from a specified base address
till the end of the RAM.

Replace iteration through the memblock.memory with a single call to
memblock_reserve() with appropriate  that will take care of proper memory
reservation.

Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
---
 arch/powerpc/kernel/fadump.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c
index 78ab9a6ee6ac..2446a61e3c25 100644
--- a/arch/powerpc/kernel/fadump.c
+++ b/arch/powerpc/kernel/fadump.c
@@ -1658,25 +1658,7 @@ int __init fadump_reserve_mem(void)
 /* Preserve everything above the base address */
 static void __init fadump_reserve_crash_area(u64 base)
 {
-	struct memblock_region *reg;
-	u64 mstart, msize;
-
-	for_each_memblock(memory, reg) {
-		mstart = reg->base;
-		msize  = reg->size;
-
-		if ((mstart + msize) < base)
-			continue;
-
-		if (mstart < base) {
-			msize -= (base - mstart);
-			mstart = base;
-		}
-
-		pr_info("Reserving %lluMB of memory at %#016llx for preserving crash data",
-			(msize >> 20), mstart);
-		memblock_reserve(mstart, msize);
-	}
+	memblock_reserve(base, memblock_end_of_DRAM() - base);
 }
 
 unsigned long __init arch_reserved_kernel_pages(void)
-- 
2.26.2