5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jisheng Zhang <jszhang@xxxxxxxxxx>
[ Upstream commit 07aabe8fb6d1ac3163cc74c856521f2ee746270b ]
Try our best to replace the conditional compilation using
"#ifdef CONFIG_64BIT" by a check for "IS_ENABLED(CONFIG_64BIT)", to
simplify the code and to increase compile coverage.
Now we can also remove the __maybe_unused used in max_mapped_addr
declaration.
We also remove the BUG_ON check of mapping the last 4K bytes of the
addressable memory since this is always true for every kernel actually.
Signed-off-by: Jisheng Zhang <jszhang@xxxxxxxxxx>
Reviewed-by: Alexandre Ghiti <alex@xxxxxxxx>
Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
Stable-dep-of: 994af1825a2a ("riscv: fix overlap of allocated page and PTR_ERR")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
arch/riscv/mm/init.c | 43 ++++++++++++++++---------------------------
1 file changed, 16 insertions(+), 27 deletions(-)
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index d7115acab3501..c9d63c476d315 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -105,10 +105,9 @@ static void __init print_vm_layout(void)
#endif
print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
(unsigned long)high_memory);
-#ifdef CONFIG_64BIT
- print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
- (unsigned long)ADDRESS_SPACE_END);
-#endif
+ if (IS_ENABLED(CONFIG_64BIT))
+ print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
+ (unsigned long)ADDRESS_SPACE_END);
}
#else
static void print_vm_layout(void) { }
@@ -166,7 +165,7 @@ static void __init setup_bootmem(void)
{
phys_addr_t vmlinux_end = __pa_symbol(&_end);
phys_addr_t vmlinux_start = __pa_symbol(&_start);
- phys_addr_t __maybe_unused max_mapped_addr;
+ phys_addr_t max_mapped_addr;
phys_addr_t phys_ram_end;
#ifdef CONFIG_XIP_KERNEL
@@ -175,17 +174,16 @@ static void __init setup_bootmem(void)
memblock_enforce_memory_limit(memory_limit);
- /*
- * Reserve from the start of the kernel to the end of the kernel
- */
-#if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
/*
* Make sure we align the reservation on PMD_SIZE since we will
* map the kernel in the linear mapping as read-only: we do not want
* any allocation to happen between _end and the next pmd aligned page.
*/
- vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
-#endif
+ if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
+ vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
+ /*
+ * Reserve from the start of the kernel to the end of the kernel
+ */
memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
@@ -193,7 +191,6 @@ static void __init setup_bootmem(void)
#ifndef CONFIG_XIP_KERNEL
phys_ram_base = memblock_start_of_DRAM();
#endif
-#ifndef CONFIG_64BIT
/*
* memblock allocator is not aware of the fact that last 4K bytes of
* the addressable memory can not be mapped because of IS_ERR_VALUE
@@ -203,10 +200,11 @@ static void __init setup_bootmem(void)
* address space is occupied by the kernel mapping then this check must
* be done as soon as the kernel mapping base address is determined.
*/
- max_mapped_addr = __pa(~(ulong)0);
- if (max_mapped_addr == (phys_ram_end - 1))
- memblock_set_current_limit(max_mapped_addr - 4096);
-#endif
+ if (!IS_ENABLED(CONFIG_64BIT)) {
+ max_mapped_addr = __pa(~(ulong)0);
+ if (max_mapped_addr == (phys_ram_end - 1))
+ memblock_set_current_limit(max_mapped_addr - 4096);
+ }
min_low_pfn = PFN_UP(phys_ram_base);
max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
@@ -630,14 +628,6 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
-#ifdef CONFIG_64BIT
- /*
- * The last 4K bytes of the addressable memory can not be mapped because
- * of IS_ERR_VALUE macro.
- */
- BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
-#endif
-
pt_ops.alloc_pte = alloc_pte_early;
pt_ops.get_pte_virt = get_pte_virt_early;
#ifndef __PAGETABLE_PMD_FOLDED
@@ -760,10 +750,9 @@ static void __init setup_vm_final(void)
}
}
-#ifdef CONFIG_64BIT
/* Map the kernel */
- create_kernel_page_table(swapper_pg_dir, false);
-#endif
+ if (IS_ENABLED(CONFIG_64BIT))
+ create_kernel_page_table(swapper_pg_dir, false);
/* Clear fixmap PTE and PMD mappings */
clear_fixmap(FIX_PTE);
--
2.43.0
