search for: fix_kmap_end

The mapping code is odd and looks broken. See FIXME in the comment. Also fix the harmless off by one in the FIX_KMAP_END define. Signed-off-by: Thomas Gleixner <tglx at linutronix.de> Cc: Nick Hu <nickhu at andestech.com> Cc: Greentime Hu <green.hu at gmail.com> Cc: Vincent Chen <deanbo422 at gmail.com> --- V3: Remove the kmap types cruft --- arch/nds32/Kconfig.cpu | 1 arch/nd...

...pes.h> +#include <asm/kmap_size.h> #endif #ifdef CONFIG_KASAN @@ -55,7 +55,7 @@ enum fixed_addresses { FIX_EARLY_DEBUG_BASE = FIX_EARLY_DEBUG_TOP+(ALIGN(SZ_128K, PAGE_SIZE)/PAGE_SIZE)-1, #ifdef CONFIG_HIGHMEM FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ - 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 #ifdef CONFIG_PPC_8xx /* For IMMR we need an aligned 512K area */ --- a/arch/powerpc/include/asm/highmem.h +++ b/arch/powerpc/include/asm/highmem.h @@ -24,12 +24,10 @@ #ifdef __KERNEL_...

...#ifdef CONFIG_HIGHMEM #include <linux/threads.h> -#include <asm/kmap_types.h> +#include <asm/kmap_size.h> #endif /* @@ -52,7 +52,7 @@ enum fixed_addresses { #ifdef CONFIG_HIGHMEM /* reserved pte's for temporary kernel mappings */ FIX_KMAP_BEGIN = FIX_CMAP_END + 1, - 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 }; --- a/arch/mips/include/asm/highmem.h +++ b/arch/mips/include/asm/highmem.h @@ -24,7 +24,7 @@ #include <linux/interrupt.h> #include <linux/uaccess...

...#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE) #include <linux/pgtable.h> -#include <asm/kmap_types.h> +#include <asm/kmap_size.h> enum fixed_addresses { FIX_EARLYCON_MEM_BASE, __end_of_permanent_fixed_addresses, FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses, - FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, + FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, /* Support writing RO kernel text via kprobes, jump labels, etc. */ FIX_TEXT_POKE0, --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -2,7 +2,7 @@ #ifndef _...

..._SIZE - PKMAP_SIZE) -#define FIXMAP_SIZE PGDIR_SIZE /* only 1 PGD worth */ -#define KM_TYPE_NR ((FIXMAP_SIZE >> PAGE_SHIFT)/NR_CPUS) -#define FIXMAP_ADDR(nr) (FIXMAP_BASE + ((nr) << PAGE_SHIFT)) + +#define FIX_KMAP_SLOTS (KM_MAX_IDX * NR_CPUS) +#define FIX_KMAP_BEGIN (0UL) +#define FIX_KMAP_END ((FIX_KMAP_BEGIN + FIX_KMAP_SLOTS) - 1) + +#define FIXADDR_TOP (FIXMAP_BASE + (FIX_KMAP_END << PAGE_SHIFT)) + +/* + * This should be converted to the asm-generic version, but of course this + * is needlessly different from all other architectures. Sigh - tglx + */ +#define __fix_to_virt(x)...

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

Following up to the discussion in: https://lore.kernel.org/r/20200914204209.256266093 at linutronix.de and the second version of this: https://lore.kernel.org/r/20201029221806.189523375 at linutronix.de this series provides a preemptible variant of kmap_atomic & related interfaces. This is achieved by: - Removing the RT dependency from migrate_disable/enable() - Consolidating all

...if /* * Here we define all the compile-time 'special' virtual @@ -53,11 +50,6 @@ enum fixed_addresses { FIX_CMAP_BEGIN, FIX_CMAP_END = FIX_CMAP_BEGIN + (FIX_N_COLOURS * NR_CPUS) - 1, -#ifdef CONFIG_HIGHMEM - FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ - FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, -#endif - #ifdef CONFIG_IOREMAP_FIXED /* * FIX_IOREMAP entries are useful for mapping physical address --- a/arch/sh/include/asm/kmap_types.h +++ /dev/null @@ -1,15 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#ifndef __SH_KMAP_TYPES_H -#defi...

This most curious patch allows the fixmap on i386 to be unfixed. The = result is that we can create a dynamically sizable hole at the top of = kernel linear address space. I know at least some virtualization = developers are interested in being able to achieve this to achieve = run-time sizing of a hole in which a hypervisor can live, or at least to = test out the performance

This most curious patch allows the fixmap on i386 to be unfixed. The = result is that we can create a dynamically sizable hole at the top of = kernel linear address space. I know at least some virtualization = developers are interested in being able to achieve this to achieve = run-time sizing of a hole in which a hypervisor can live, or at least to = test out the performance

...eturn kmap; + + return __kmap_local_pfn_prot(page_to_pfn(page), prot); +} +EXPORT_SYMBOL(__kmap_local_page_prot); + +void kunmap_local_indexed(void *vaddr) +{ + unsigned long addr = (unsigned long) vaddr & PAGE_MASK; + pte_t *kmap_pte = kmap_get_pte(); + int idx; + + if (addr < __fix_to_virt(FIX_KMAP_END) || + addr > __fix_to_virt(FIX_KMAP_BEGIN)) { + WARN_ON_ONCE(addr < PAGE_OFFSET); + + /* Handle mappings which were obtained by kmap_high_get() */ + kmap_high_unmap_local(addr); + return; + } + + preempt_disable(); + idx = arch_kmap_local_unmap_idx(kmap_local_idx(), addr); + WARN_ON_O...

...PMDs, make + * sure the pte pages are allocated contiguously. It might need up + * to two additional pte pages to replace the page declared by + * head_32.S and the one allocated by early_ioremap_init, if they + * are even partially used for the kmap. + */ + kmap_begin_pmd_idx = __fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT; + kmap_end_pmd_idx = __fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT; + if (kmap_begin_pmd_idx != kmap_end_pmd_idx) { + if (kmap_end_pmd_idx == fixmap_end_pmd_idx) + size++; + if (btmap_begin_pmd_idx >= kmap_begin_pmd_idx && + btmap_begin_pmd_idx <= kmap_en...