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![Mike Rapoport](/assets/img/avatar_default.png)
Patch series "mm: consolidate definitions of page table accessors", v2. The low level page table accessors (pXY_index(), pXY_offset()) are duplicated across all architectures and sometimes more than once. For instance, we have 31 definition of pgd_offset() for 25 supported architectures. Most of these definitions are actually identical and typically it boils down to, e.g. static inline unsigned long pmd_index(unsigned long address) { return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1); } static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address) { return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address); } These definitions can be shared among 90% of the arches provided XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined. For architectures that really need a custom version there is always possibility to override the generic version with the usual ifdefs magic. These patches introduce include/linux/pgtable.h that replaces include/asm-generic/pgtable.h and add the definitions of the page table accessors to the new header. This patch (of 12): The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the functions involving page table manipulations, e.g. pte_alloc() and pmd_alloc(). So, there is no point to explicitly include <asm/pgtable.h> in the files that include <linux/mm.h>. The include statements in such cases are remove with a simple loop: for f in $(git grep -l "include <linux/mm.h>") ; do sed -i -e '/include <asm\/pgtable.h>/ d' $f done Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chris Zankel <chris@zankel.net> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vincent Chen <deanbo422@gmail.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Will Deacon <will@kernel.org> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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* uboot.c -- uboot arguments support
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/fb.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/console.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/memblock.h>
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#include <linux/seq_file.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/root_dev.h>
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#include <linux/rtc.h>
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#include <asm/setup.h>
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#include <asm/irq.h>
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#include <asm/machdep.h>
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#include <asm/sections.h>
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/*
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* parse_uboot_commandline
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*
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* Copies u-boot commandline arguments and store them in the proper linux
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* variables.
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*
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* Assumes:
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* _init_sp global contains the address in the stack pointer when the
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* kernel starts (see head.S::_start)
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*
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* U-Boot calling convention:
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* (*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
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*
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* _init_sp can be parsed as such
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*
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* _init_sp+00 = u-boot cmd after jsr into kernel (skip)
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* _init_sp+04 = &kernel board_info (residual data)
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* _init_sp+08 = &initrd_start
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* _init_sp+12 = &initrd_end
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* _init_sp+16 = &cmd_start
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* _init_sp+20 = &cmd_end
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*
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* This also assumes that the memory locations pointed to are still
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* unmodified. U-boot places them near the end of external SDRAM.
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*
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* Argument(s):
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* commandp = the linux commandline arg container to fill.
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* size = the sizeof commandp.
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*
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* Returns:
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*/
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static void __init parse_uboot_commandline(char *commandp, int size)
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{
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extern unsigned long _init_sp;
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unsigned long *sp;
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unsigned long uboot_kbd;
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unsigned long uboot_initrd_start, uboot_initrd_end;
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unsigned long uboot_cmd_start, uboot_cmd_end;
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sp = (unsigned long *)_init_sp;
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uboot_kbd = sp[1];
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uboot_initrd_start = sp[2];
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uboot_initrd_end = sp[3];
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uboot_cmd_start = sp[4];
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uboot_cmd_end = sp[5];
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if (uboot_cmd_start && uboot_cmd_end)
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strncpy(commandp, (const char *)uboot_cmd_start, size);
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#if defined(CONFIG_BLK_DEV_INITRD)
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if (uboot_initrd_start && uboot_initrd_end &&
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(uboot_initrd_end > uboot_initrd_start)) {
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initrd_start = uboot_initrd_start;
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initrd_end = uboot_initrd_end;
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ROOT_DEV = Root_RAM0;
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pr_info("initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
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}
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#endif /* if defined(CONFIG_BLK_DEV_INITRD) */
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}
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__init void process_uboot_commandline(char *commandp, int size)
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{
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int len, n;
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n = strnlen(commandp, size);
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commandp += n;
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len = size - n;
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if (len) {
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/* Add the whitespace separator */
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*commandp++ = ' ';
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len--;
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}
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parse_uboot_commandline(commandp, len);
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commandp[len - 1] = 0;
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}
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