linux-kernel - [PATCH v2 5/5] riscv: mm: init: try best to remove #ifdef CONFIG_XIP

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Message-Id: <20211206150353.731-6-jszhang@kernel.org>
Date:   Mon,  6 Dec 2021 23:03:53 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexandre Ghiti <alex@...ti.fr>
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/5] riscv: mm: init: try best to remove #ifdef CONFIG_XIP_KERNEL usage

Currently, the #ifdef CONFIG_XIP_KERNEL usage can be divided into the
following three types:

The first one is for functions/declarations only used in XIP case.

The second one is for XIP_FIXUP case. Something as below:
|foo_type foo;
|#ifdef CONFIG_XIP_KERNEL
|#define foo    (*(foo_type *)XIP_FIXUP(&foo))
|#endif

Usually, it's better to let the foo macro sit with the foo var
together. But if various foos are defined adjacently, we can
save some #ifdef CONFIG_XIP_KERNEL usage by grouping them together.

The third one is for different implementations for XIP, usually, this
is a #ifdef...#else...#endif case.

This patch moves the pt_ops macro to adjacent #ifdef CONFIG_XIP_KERNEL
and group first type usage cases into one.

Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
Reviewed-by: Alexandre Ghiti <alex@...ti.fr>
---
 arch/riscv/mm/init.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 5e979fe06054..a15640eeb334 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -40,10 +40,6 @@ EXPORT_SYMBOL(kernel_map);
 phys_addr_t phys_ram_base __ro_after_init;
 EXPORT_SYMBOL(phys_ram_base);
 
-#ifdef CONFIG_XIP_KERNEL
-extern char _xiprom[], _exiprom[], __data_loc;
-#endif
-
 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
 							__page_aligned_bss;
 EXPORT_SYMBOL(empty_zero_page);
@@ -227,10 +223,6 @@ static void __init setup_bootmem(void)
 #ifdef CONFIG_MMU
 static struct pt_alloc_ops pt_ops __initdata;
 
-#ifdef CONFIG_XIP_KERNEL
-#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
-#endif
-
 unsigned long riscv_pfn_base __ro_after_init;
 EXPORT_SYMBOL(riscv_pfn_base);
 
@@ -242,6 +234,7 @@ pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
 static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
 
 #ifdef CONFIG_XIP_KERNEL
+#define pt_ops			(*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
 #define trampoline_pg_dir      ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
 #define fixmap_pte             ((pte_t *)XIP_FIXUP(fixmap_pte))
 #define early_pg_dir           ((pgd_t *)XIP_FIXUP(early_pg_dir))
@@ -445,6 +438,8 @@ static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
 }
 
 #ifdef CONFIG_XIP_KERNEL
+extern char _xiprom[], _exiprom[], __data_loc;
+
 /* called from head.S with MMU off */
 asmlinkage void __init __copy_data(void)
 {
-- 
2.34.1