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6215d9f447
Reduce 22 declarations of empty_zero_page to 3 and 23 declarations of ZERO_PAGE() to 4. Every architecture defines empty_zero_page that way or another, but for the most of them it is always a page aligned page in BSS and most definitions of ZERO_PAGE do virt_to_page(empty_zero_page). Move Linus vetted x86 definition of empty_zero_page and ZERO_PAGE() to the core MM and drop these definitions in architectures that do not implement colored zero page (MIPS and s390). ZERO_PAGE() remains a macro because turning it to a wrapper for a static inline causes severe pain in header dependencies. For the most part the change is mechanical, with these being noteworthy: * alpha: aliased empty_zero_page with ZERO_PGE that was also used for boot parameters. Switching to a generic empty_zero_page removes the aliasing and keeps ZERO_PGE for boot parameters only * arm64: uses __pa_symbol() in ZERO_PAGE() so that definition of ZERO_PAGE() is kept intact. * m68k/parisc/um: allocated empty_zero_page from memblock, although they do not support zero page coloring and having it in BSS will work fine. * sparc64 can have empty_zero_page in BSS rather allocate it, but it can't use virt_to_page() for BSS. Keep it's definition of ZERO_PAGE() but instead of allocating it, make mem_map_zero point to empty_zero_page. * sh: used empty_zero_page for boot parameters at the very early boot. Rename the parameters page to boot_params_page and let sh use the generic empty_zero_page. * hexagon: had an amusing comment about empty_zero_page /* A handy thing to have if one has the RAM. Declared in head.S */ that unfortunately had to go :) Link: https://lkml.kernel.org/r/20260211103141.3215197-4-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Acked-by: Helge Deller <deller@gmx.de> [parisc] Tested-by: Helge Deller <deller@gmx.de> [parisc] Reviewed-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Magnus Lindholm <linmag7@gmail.com> [alpha] Acked-by: Dinh Nguyen <dinguyen@kernel.org> [nios2] Acked-by: Andreas Larsson <andreas@gaisler.com> [sparc] Acked-by: David Hildenbrand (Arm) <david@kernel.org> Acked-by: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: David S. Miller <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Guo Ren <guoren@kernel.org> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#ifndef __KERN_UTIL_H__
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#define __KERN_UTIL_H__
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#include <sysdep/ptrace.h>
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#include <sysdep/faultinfo.h>
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struct siginfo;
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extern int uml_exitcode;
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extern int kmalloc_ok;
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extern unsigned long alloc_stack(int order, int atomic);
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extern void free_stack(unsigned long stack, int order);
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struct pt_regs;
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extern void do_signal(struct pt_regs *regs);
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extern void interrupt_end(void);
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extern void relay_signal(int sig, struct siginfo *si, struct uml_pt_regs *regs,
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void *mc);
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extern unsigned long segv(struct faultinfo fi, unsigned long ip,
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int is_user, struct uml_pt_regs *regs,
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void *mc);
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extern int handle_page_fault(unsigned long address, unsigned long ip,
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int is_write, int is_user, int *code_out);
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extern unsigned int do_IRQ(int irq, struct uml_pt_regs *regs);
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extern void initial_thread_cb(void (*proc)(void *), void *arg);
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extern void timer_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs);
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extern void uml_pm_wake(void);
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extern int start_uml(void);
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extern void uml_cleanup(void);
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extern void do_uml_exitcalls(void);
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/*
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* Are we disallowed to sleep? Used to choose between GFP_KERNEL and
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* GFP_ATOMIC.
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*/
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extern int __uml_cant_sleep(void);
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extern int get_current_pid(void);
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extern int copy_from_user_proc(void *to, void *from, int size);
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extern char *uml_strdup(const char *string);
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int uml_need_resched(void);
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extern unsigned long to_irq_stack(unsigned long *mask_out);
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extern unsigned long from_irq_stack(int nested);
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extern int singlestepping(void);
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extern void segv_handler(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs,
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void *mc);
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extern void winch(int sig, struct siginfo *unused_si, struct uml_pt_regs *regs,
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void *mc);
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extern void fatal_sigsegv(void) __attribute__ ((noreturn));
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void um_idle_sleep(void);
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void kasan_map_memory(void *start, size_t len);
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#endif
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