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Diffstat (limited to '')
| -rw-r--r-- | debian/patches-rt/0039-sparc-mm-highmem-Switch-to-generic-kmap-atomic.patch | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/debian/patches-rt/0039-sparc-mm-highmem-Switch-to-generic-kmap-atomic.patch b/debian/patches-rt/0039-sparc-mm-highmem-Switch-to-generic-kmap-atomic.patch new file mode 100644 index 000000000..5ac60d218 --- /dev/null +++ b/debian/patches-rt/0039-sparc-mm-highmem-Switch-to-generic-kmap-atomic.patch @@ -0,0 +1,254 @@ +From 859a29e0206dcd137ea0db376a846246f1071bfb Mon Sep 17 00:00:00 2001 +From: Thomas Gleixner <tglx@linutronix.de> +Date: Tue, 3 Nov 2020 10:27:28 +0100 +Subject: [PATCH 039/323] sparc/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: "David S. Miller" <davem@davemloft.net> +Cc: sparclinux@vger.kernel.org +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + arch/sparc/Kconfig | 1 + + arch/sparc/include/asm/highmem.h | 8 +- + arch/sparc/include/asm/kmap_types.h | 11 --- + arch/sparc/include/asm/vaddrs.h | 4 +- + arch/sparc/mm/Makefile | 3 - + arch/sparc/mm/highmem.c | 115 ---------------------------- + arch/sparc/mm/srmmu.c | 2 - + 7 files changed, 8 insertions(+), 136 deletions(-) + delete mode 100644 arch/sparc/include/asm/kmap_types.h + delete mode 100644 arch/sparc/mm/highmem.c + +diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig +index 7e2ce4c8d657..1a6e4b187861 100644 +--- a/arch/sparc/Kconfig ++++ b/arch/sparc/Kconfig +@@ -140,6 +140,7 @@ config MMU + config HIGHMEM + bool + default y if SPARC32 ++ select KMAP_LOCAL + + config ZONE_DMA + bool +diff --git a/arch/sparc/include/asm/highmem.h b/arch/sparc/include/asm/highmem.h +index 6c35f0d27ee1..875116209ec1 100644 +--- a/arch/sparc/include/asm/highmem.h ++++ b/arch/sparc/include/asm/highmem.h +@@ -24,7 +24,6 @@ + #include <linux/interrupt.h> + #include <linux/pgtable.h> + #include <asm/vaddrs.h> +-#include <asm/kmap_types.h> + #include <asm/pgtsrmmu.h> + + /* declarations for highmem.c */ +@@ -33,8 +32,6 @@ extern unsigned long highstart_pfn, highend_pfn; + #define kmap_prot __pgprot(SRMMU_ET_PTE | SRMMU_PRIV | SRMMU_CACHE) + extern pte_t *pkmap_page_table; + +-void kmap_init(void) __init; +- + /* + * Right now we initialize only a single pte table. It can be extended + * easily, subsequent pte tables have to be allocated in one physical +@@ -53,6 +50,11 @@ void kmap_init(void) __init; + + #define flush_cache_kmaps() flush_cache_all() + ++/* FIXME: Use __flush_tlb_one(vaddr) instead of flush_cache_all() -- Anton */ ++#define arch_kmap_local_post_map(vaddr, pteval) flush_cache_all() ++#define arch_kmap_local_post_unmap(vaddr) flush_cache_all() ++ ++ + #endif /* __KERNEL__ */ + + #endif /* _ASM_HIGHMEM_H */ +diff --git a/arch/sparc/include/asm/kmap_types.h b/arch/sparc/include/asm/kmap_types.h +deleted file mode 100644 +index 55a99b6bd91e..000000000000 +--- a/arch/sparc/include/asm/kmap_types.h ++++ /dev/null +@@ -1,11 +0,0 @@ +-/* SPDX-License-Identifier: GPL-2.0 */ +-#ifndef _ASM_KMAP_TYPES_H +-#define _ASM_KMAP_TYPES_H +- +-/* Dummy header just to define km_type. None of this +- * is actually used on sparc. -DaveM +- */ +- +-#include <asm-generic/kmap_types.h> +- +-#endif +diff --git a/arch/sparc/include/asm/vaddrs.h b/arch/sparc/include/asm/vaddrs.h +index 84d054b07a6f..4fec0341e2a8 100644 +--- a/arch/sparc/include/asm/vaddrs.h ++++ b/arch/sparc/include/asm/vaddrs.h +@@ -32,13 +32,13 @@ + #define SRMMU_NOCACHE_ALCRATIO 64 /* 256 pages per 64MB of system RAM */ + + #ifndef __ASSEMBLY__ +-#include <asm/kmap_types.h> ++#include <asm/kmap_size.h> + + enum fixed_addresses { + FIX_HOLE, + #ifdef CONFIG_HIGHMEM + FIX_KMAP_BEGIN, +- FIX_KMAP_END = (KM_TYPE_NR * NR_CPUS), ++ FIX_KMAP_END = (KM_MAX_IDX * NR_CPUS), + #endif + __end_of_fixed_addresses + }; +diff --git a/arch/sparc/mm/Makefile b/arch/sparc/mm/Makefile +index b078205b70e0..68db1f859b02 100644 +--- a/arch/sparc/mm/Makefile ++++ b/arch/sparc/mm/Makefile +@@ -15,6 +15,3 @@ obj-$(CONFIG_SPARC32) += leon_mm.o + + # Only used by sparc64 + obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o +- +-# Only used by sparc32 +-obj-$(CONFIG_HIGHMEM) += highmem.o +diff --git a/arch/sparc/mm/highmem.c b/arch/sparc/mm/highmem.c +deleted file mode 100644 +index 8f2a2afb048a..000000000000 +--- a/arch/sparc/mm/highmem.c ++++ /dev/null +@@ -1,115 +0,0 @@ +-// SPDX-License-Identifier: GPL-2.0 +-/* +- * highmem.c: virtual kernel memory mappings for high memory +- * +- * Provides kernel-static versions of atomic kmap functions originally +- * found as inlines in include/asm-sparc/highmem.h. These became +- * needed as kmap_atomic() and kunmap_atomic() started getting +- * called from within modules. +- * -- Tomas Szepe <szepe@pinerecords.com>, September 2002 +- * +- * But kmap_atomic() and kunmap_atomic() cannot be inlined in +- * modules because they are loaded with btfixup-ped functions. +- */ +- +-/* +- * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap +- * gives a more generic (and caching) interface. But kmap_atomic can +- * be used in IRQ contexts, so in some (very limited) cases we need it. +- * +- * XXX This is an old text. Actually, it's good to use atomic kmaps, +- * provided you remember that they are atomic and not try to sleep +- * with a kmap taken, much like a spinlock. Non-atomic kmaps are +- * shared by CPUs, and so precious, and establishing them requires IPI. +- * Atomic kmaps are lightweight and we may have NCPUS more of them. +- */ +-#include <linux/highmem.h> +-#include <linux/export.h> +-#include <linux/mm.h> +- +-#include <asm/cacheflush.h> +-#include <asm/tlbflush.h> +-#include <asm/vaddrs.h> +- +-static pte_t *kmap_pte; +- +-void __init kmap_init(void) +-{ +- unsigned long address = __fix_to_virt(FIX_KMAP_BEGIN); +- +- /* cache the first kmap pte */ +- kmap_pte = virt_to_kpte(address); +-} +- +-void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) +-{ +- unsigned long vaddr; +- long idx, type; +- +- type = kmap_atomic_idx_push(); +- idx = type + KM_TYPE_NR*smp_processor_id(); +- vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); +- +-/* XXX Fix - Anton */ +-#if 0 +- __flush_cache_one(vaddr); +-#else +- flush_cache_all(); +-#endif +- +-#ifdef CONFIG_DEBUG_HIGHMEM +- BUG_ON(!pte_none(*(kmap_pte-idx))); +-#endif +- set_pte(kmap_pte-idx, mk_pte(page, prot)); +-/* XXX Fix - Anton */ +-#if 0 +- __flush_tlb_one(vaddr); +-#else +- flush_tlb_all(); +-#endif +- +- return (void*) vaddr; +-} +-EXPORT_SYMBOL(kmap_atomic_high_prot); +- +-void kunmap_atomic_high(void *kvaddr) +-{ +- unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; +- int type; +- +- if (vaddr < FIXADDR_START) +- return; +- +- type = kmap_atomic_idx(); +- +-#ifdef CONFIG_DEBUG_HIGHMEM +- { +- unsigned long idx; +- +- idx = type + KM_TYPE_NR * smp_processor_id(); +- BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN+idx)); +- +- /* XXX Fix - Anton */ +-#if 0 +- __flush_cache_one(vaddr); +-#else +- flush_cache_all(); +-#endif +- +- /* +- * force other mappings to Oops if they'll try to access +- * this pte without first remap it +- */ +- pte_clear(&init_mm, vaddr, kmap_pte-idx); +- /* XXX Fix - Anton */ +-#if 0 +- __flush_tlb_one(vaddr); +-#else +- flush_tlb_all(); +-#endif +- } +-#endif +- +- kmap_atomic_idx_pop(); +-} +-EXPORT_SYMBOL(kunmap_atomic_high); +diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c +index 0070f8b9a753..a03caa5f6628 100644 +--- a/arch/sparc/mm/srmmu.c ++++ b/arch/sparc/mm/srmmu.c +@@ -971,8 +971,6 @@ void __init srmmu_paging_init(void) + + sparc_context_init(num_contexts); + +- kmap_init(); +- + { + unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 }; + +-- +2.43.0 + |