linux-kernel - linux-next: manual merge of the risc-v tree with Linus' tree

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Date:   Wed, 31 Mar 2021 09:40:34 +1100
From:   Stephen Rothwell <sfr@...b.auug.org.au>
To:     Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <paul@...an.com>
Cc:     Alexandre Ghiti <alex@...ti.fr>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>
Subject: linux-next: manual merge of the risc-v tree with Linus' tree

Hi all,

Today's linux-next merge of the risc-v tree got a conflict in:

  arch/riscv/mm/kasan_init.c

between commits:

  f3773dd031de ("riscv: Ensure page table writes are flushed when initializing KASAN vmalloc")
  78947bdfd752 ("RISC-V: kasan: Declare kasan_shallow_populate() static")

from Linus' tree and commit:

  2da073c19641 ("riscv: Cleanup KASAN_VMALLOC support")

from the risc-v tree.

I fixed it up (I think - see below) and can carry the fix as
necessary. This is now fixed as far as linux-next is concerned, but any
non trivial conflicts should be mentioned to your upstream maintainer
when your tree is submitted for merging.  You may also want to consider
cooperating with the maintainer of the conflicting tree to minimise any
particularly complex conflicts.

-- 
Cheers,
Stephen Rothwell

diff --cc arch/riscv/mm/kasan_init.c
index 4f85c6d0ddf8,2c39f0386673..000000000000
--- a/arch/riscv/mm/kasan_init.c
+++ b/arch/riscv/mm/kasan_init.c
@@@ -153,44 -141,31 +141,33 @@@ static void __init kasan_populate(void 
  
  	local_flush_tlb_all();
  	memset(start, KASAN_SHADOW_INIT, end - start);
  }
  
+ static void __init kasan_shallow_populate_pgd(unsigned long vaddr, unsigned long end)
+ {
+ 	unsigned long next;
+ 	void *p;
+ 	pgd_t *pgd_k = pgd_offset_k(vaddr);
+ 
+ 	do {
+ 		next = pgd_addr_end(vaddr, end);
+ 		if (pgd_page_vaddr(*pgd_k) == (unsigned long)lm_alias(kasan_early_shadow_pmd)) {
+ 			p = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ 			set_pgd(pgd_k, pfn_pgd(PFN_DOWN(__pa(p)), PAGE_TABLE));
+ 		}
+ 	} while (pgd_k++, vaddr = next, vaddr != end);
+ }
+ 
  static void __init kasan_shallow_populate(void *start, void *end)
  {
  	unsigned long vaddr = (unsigned long)start & PAGE_MASK;
  	unsigned long vend = PAGE_ALIGN((unsigned long)end);
- 	unsigned long pfn;
- 	int index;
- 	void *p;
- 	pud_t *pud_dir, *pud_k;
- 	pgd_t *pgd_dir, *pgd_k;
- 	p4d_t *p4d_dir, *p4d_k;
- 
- 	while (vaddr < vend) {
- 		index = pgd_index(vaddr);
- 		pfn = csr_read(CSR_SATP) & SATP_PPN;
- 		pgd_dir = (pgd_t *)pfn_to_virt(pfn) + index;
- 		pgd_k = init_mm.pgd + index;
- 		pgd_dir = pgd_offset_k(vaddr);
- 		set_pgd(pgd_dir, *pgd_k);
- 
- 		p4d_dir = p4d_offset(pgd_dir, vaddr);
- 		p4d_k  = p4d_offset(pgd_k, vaddr);
- 
- 		vaddr = (vaddr + PUD_SIZE) & PUD_MASK;
- 		pud_dir = pud_offset(p4d_dir, vaddr);
- 		pud_k = pud_offset(p4d_k, vaddr);
- 
- 		if (pud_present(*pud_dir)) {
- 			p = early_alloc(PAGE_SIZE, NUMA_NO_NODE);
- 			pud_populate(&init_mm, pud_dir, p);
- 		}
- 		vaddr += PAGE_SIZE;
- 	}
+ 
+ 	kasan_shallow_populate_pgd(vaddr, vend);
 +
 +	local_flush_tlb_all();
  }
  
  void __init kasan_init(void)
  {
  	phys_addr_t _start, _end;

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