[PATCH v4 05/11] riscv: mm: Add pfn_to_kaddr() implementation

From: "Björn Töpel" <bjorn@kernel.org>
To: Alexandre Ghiti <alexghiti@rivosinc.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	David Hildenbrand <david@redhat.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	linux-riscv@lists.infradead.org,
	Oscar Salvador <osalvador@suse.de>
Cc: "Lorenzo Stoakes" <lstoakes@gmail.com>,
	"Chethan Seshadri" <Chethan.Seshadri@catalinasystems.io>,
	linux-kernel@vger.kernel.org,
	"Andrew Bresticker" <abrestic@rivosinc.com>,
	"Björn Töpel" <bjorn@rivosinc.com>,
	"Santosh Mamila" <santosh.mamila@catalinasystems.io>,
	linux-mm@kvack.org,
	"Sivakumar Munnangi" <siva.munnangi@catalinasystems.io>,
	virtualization@lists.linux-foundation.org
Subject: [PATCH v4 05/11] riscv: mm: Add pfn_to_kaddr() implementation
Date: Wed,  5 Jun 2024 13:40:48 +0200	[thread overview]
Message-ID: <20240605114100.315918-6-bjorn@kernel.org> (raw)
In-Reply-To: <20240605114100.315918-1-bjorn@kernel.org>

From: Björn Töpel <bjorn@rivosinc.com>

The pfn_to_kaddr() function is used by KASAN's memory hotplugging
path. Add the missing function to the RISC-V port, so that it can be
built with MHP and CONFIG_KASAN.

Signed-off-by: Björn Töpel <bjorn@rivosinc.com>
---
 arch/riscv/include/asm/page.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index 115ac98b8d72..235fd45d998d 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -188,6 +188,11 @@ extern phys_addr_t __phys_addr_symbol(unsigned long x);
 
 unsigned long kaslr_offset(void);
 
+static __always_inline void *pfn_to_kaddr(unsigned long pfn)
+{
+	return __va(pfn << PAGE_SHIFT);
+}
+
 #endif /* __ASSEMBLY__ */
 
 #define virt_addr_valid(vaddr)	({						\
-- 
2.43.0


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