diff options
Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0034-csky-mm-highmem-Switch-to-generic-kmap-atomic.patch | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/debian/patches-rt/0034-csky-mm-highmem-Switch-to-generic-kmap-atomic.patch b/debian/patches-rt/0034-csky-mm-highmem-Switch-to-generic-kmap-atomic.patch new file mode 100644 index 000000000..667836a1e --- /dev/null +++ b/debian/patches-rt/0034-csky-mm-highmem-Switch-to-generic-kmap-atomic.patch @@ -0,0 +1,179 @@ +From 3af9ca89d4398239a71471cffb488e3104990e23 Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 3 Nov 2020 10:27:23 +0100 +Subject: [PATCH 034/323] csky/mm/highmem: Switch to generic kmap atomic +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.10/older/patches-5.10.204-rt100.tar.xz + +No reason having the same code in every architecture. + +Signed-off-by: Thomas Gleixner <tglx@linutronix.de> +Cc: linux-csky@vger.kernel.org +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + arch/csky/Kconfig | 1 + + arch/csky/include/asm/fixmap.h | 4 +- + arch/csky/include/asm/highmem.h | 6 ++- + arch/csky/mm/highmem.c | 75 +-------------------------------- + 4 files changed, 8 insertions(+), 78 deletions(-) + +diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig +index 7bf0a617e94c..c9f2533cc53d 100644 +--- a/arch/csky/Kconfig ++++ b/arch/csky/Kconfig +@@ -286,6 +286,7 @@ config NR_CPUS + config HIGHMEM + bool "High Memory Support" + depends on !CPU_CK610 ++ select KMAP_LOCAL + default y + + config FORCE_MAX_ZONEORDER +diff --git a/arch/csky/include/asm/fixmap.h b/arch/csky/include/asm/fixmap.h +index 81f9477d5330..4b589cc20900 100644 +--- a/arch/csky/include/asm/fixmap.h ++++ b/arch/csky/include/asm/fixmap.h +@@ -8,7 +8,7 @@ + #include <asm/memory.h> + #ifdef CONFIG_HIGHMEM + #include <linux/threads.h> +-#include <asm/kmap_types.h> ++#include <asm/kmap_size.h> + #endif + + enum fixed_addresses { +@@ -17,7 +17,7 @@ enum fixed_addresses { + #endif + #ifdef CONFIG_HIGHMEM + FIX_KMAP_BEGIN, +- FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, ++ FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, + #endif + __end_of_fixed_addresses + }; +diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h +index 14645e3d5cd5..1f4ed3f4c0d9 100644 +--- a/arch/csky/include/asm/highmem.h ++++ b/arch/csky/include/asm/highmem.h +@@ -9,7 +9,7 @@ + #include <linux/init.h> + #include <linux/interrupt.h> + #include <linux/uaccess.h> +-#include <asm/kmap_types.h> ++#include <asm/kmap_size.h> + #include <asm/cache.h> + + /* undef for production */ +@@ -32,10 +32,12 @@ extern pte_t *pkmap_page_table; + + #define ARCH_HAS_KMAP_FLUSH_TLB + extern void kmap_flush_tlb(unsigned long addr); +-extern void *kmap_atomic_pfn(unsigned long pfn); + + #define flush_cache_kmaps() do {} while (0) + ++#define arch_kmap_local_post_map(vaddr, pteval) kmap_flush_tlb(vaddr) ++#define arch_kmap_local_post_unmap(vaddr) kmap_flush_tlb(vaddr) ++ + extern void kmap_init(void); + + #endif /* __KERNEL__ */ +diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c +index 89c10800a002..4161df3c6c15 100644 +--- a/arch/csky/mm/highmem.c ++++ b/arch/csky/mm/highmem.c +@@ -9,8 +9,6 @@ + #include <asm/tlbflush.h> + #include <asm/cacheflush.h> + +-static pte_t *kmap_pte; +- + unsigned long highstart_pfn, highend_pfn; + + void kmap_flush_tlb(unsigned long addr) +@@ -19,67 +17,7 @@ void kmap_flush_tlb(unsigned long addr) + } + EXPORT_SYMBOL(kmap_flush_tlb); + +-void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) +-{ +- unsigned long vaddr; +- int idx, type; +- +- type = kmap_atomic_idx_push(); +- idx = type + KM_TYPE_NR*smp_processor_id(); +- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); +-#ifdef CONFIG_DEBUG_HIGHMEM +- BUG_ON(!pte_none(*(kmap_pte - idx))); +-#endif +- set_pte(kmap_pte-idx, mk_pte(page, prot)); +- flush_tlb_one((unsigned long)vaddr); +- +- return (void *)vaddr; +-} +-EXPORT_SYMBOL(kmap_atomic_high_prot); +- +-void kunmap_atomic_high(void *kvaddr) +-{ +- unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; +- int idx; +- +- if (vaddr < FIXADDR_START) +- return; +- +-#ifdef CONFIG_DEBUG_HIGHMEM +- idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx(); +- +- BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); +- +- pte_clear(&init_mm, vaddr, kmap_pte - idx); +- flush_tlb_one(vaddr); +-#else +- (void) idx; /* to kill a warning */ +-#endif +- kmap_atomic_idx_pop(); +-} +-EXPORT_SYMBOL(kunmap_atomic_high); +- +-/* +- * This is the same as kmap_atomic() but can map memory that doesn't +- * have a struct page associated with it. +- */ +-void *kmap_atomic_pfn(unsigned long pfn) +-{ +- unsigned long vaddr; +- int idx, type; +- +- pagefault_disable(); +- +- type = kmap_atomic_idx_push(); +- idx = type + KM_TYPE_NR*smp_processor_id(); +- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); +- set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL)); +- flush_tlb_one(vaddr); +- +- return (void *) vaddr; +-} +- +-static void __init kmap_pages_init(void) ++void __init kmap_init(void) + { + unsigned long vaddr; + pgd_t *pgd; +@@ -96,14 +34,3 @@ static void __init kmap_pages_init(void) + pte = pte_offset_kernel(pmd, vaddr); + pkmap_page_table = pte; + } +- +-void __init kmap_init(void) +-{ +- unsigned long vaddr; +- +- kmap_pages_init(); +- +- vaddr = __fix_to_virt(FIX_KMAP_BEGIN); +- +- kmap_pte = pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr); +-} +-- +2.43.0 + |