linux-kernel - [PATCH] riscv: fix fs/proc/kcore.c compilation with sparsemem enabled

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Date:   Tue, 22 Oct 2019 19:21:35 +0300
From:   David Abdurachmanov <david.abdurachmanov@...il.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <Anup.Patel@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Greentime Hu <greentime.hu@...ive.com>,
        "Stefan O'Rear" <sorear2@...il.com>,
        David Abdurachmanov <david.abdurachmanov@...ive.com>,
        Alexandre Ghiti <alex@...ti.fr>,
        Logan Gunthorpe <logang@...tatee.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     david.abdurachmanov@...il.com
Subject: [PATCH] riscv: fix fs/proc/kcore.c compilation with sparsemem enabled

Failed to compile Fedora/RISCV kernel (5.4-rc3+) with sparsemem enabled:

fs/proc/kcore.c: In function 'read_kcore':
fs/proc/kcore.c:510:8: error: implicit declaration of function 'kern_addr_valid'; did you mean 'virt_addr_valid'? [-Werror=implicit-function-declaration]
  510 |    if (kern_addr_valid(start)) {
      |        ^~~~~~~~~~~~~~~
      |        virt_addr_valid

Looking at other architectures I don't see kern_addr_valid being guarded by
CONFIG_FLATMEM.

Fixes: d95f1a542c3d ("RISC-V: Implement sparsemem")
Signed-off-by: David Abdurachmanov <david.abdurachmanov@...ive.com>
Tested-by: David Abdurachmanov <david.abdurachmanov@...ive.com>
---
 arch/riscv/include/asm/pgtable.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
index 42292d99cc74..7110879358b8 100644
--- a/arch/riscv/include/asm/pgtable.h
+++ b/arch/riscv/include/asm/pgtable.h
@@ -428,9 +428,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
 
-#ifdef CONFIG_FLATMEM
 #define kern_addr_valid(addr)   (1) /* FIXME */
-#endif
 
 extern void *dtb_early_va;
 extern void setup_bootmem(void);
-- 
2.21.0