forked from luck/tmp_suning_uos_patched
4e950f6f01
Remove fs.h from mm.h. For this, 1) Uninline vma_wants_writenotify(). It's pretty huge anyway. 2) Add back fs.h or less bloated headers (err.h) to files that need it. As result, on x86_64 allyesconfig, fs.h dependencies cut down from 3929 files rebuilt down to 3444 (-12.3%). Cross-compile tested without regressions on my two usual configs and (sigh): alpha arm-mx1ads mips-bigsur powerpc-ebony alpha-allnoconfig arm-neponset mips-capcella powerpc-g5 alpha-defconfig arm-netwinder mips-cobalt powerpc-holly alpha-up arm-netx mips-db1000 powerpc-iseries arm arm-ns9xxx mips-db1100 powerpc-linkstation arm-assabet arm-omap_h2_1610 mips-db1200 powerpc-lite5200 arm-at91rm9200dk arm-onearm mips-db1500 powerpc-maple arm-at91rm9200ek arm-picotux200 mips-db1550 powerpc-mpc7448_hpc2 arm-at91sam9260ek arm-pleb mips-ddb5477 powerpc-mpc8272_ads arm-at91sam9261ek arm-pnx4008 mips-decstation powerpc-mpc8313_rdb arm-at91sam9263ek arm-pxa255-idp mips-e55 powerpc-mpc832x_mds arm-at91sam9rlek arm-realview mips-emma2rh powerpc-mpc832x_rdb arm-ateb9200 arm-realview-smp mips-excite powerpc-mpc834x_itx arm-badge4 arm-rpc mips-fulong powerpc-mpc834x_itxgp arm-carmeva arm-s3c2410 mips-ip22 powerpc-mpc834x_mds arm-cerfcube arm-shannon mips-ip27 powerpc-mpc836x_mds arm-clps7500 arm-shark mips-ip32 powerpc-mpc8540_ads arm-collie arm-simpad mips-jazz powerpc-mpc8544_ds arm-corgi arm-spitz mips-jmr3927 powerpc-mpc8560_ads arm-csb337 arm-trizeps4 mips-malta powerpc-mpc8568mds arm-csb637 arm-versatile mips-mipssim powerpc-mpc85xx_cds arm-ebsa110 i386 mips-mpc30x powerpc-mpc8641_hpcn arm-edb7211 i386-allnoconfig mips-msp71xx powerpc-mpc866_ads arm-em_x270 i386-defconfig mips-ocelot powerpc-mpc885_ads arm-ep93xx i386-up mips-pb1100 powerpc-pasemi arm-footbridge ia64 mips-pb1500 powerpc-pmac32 arm-fortunet ia64-allnoconfig mips-pb1550 powerpc-ppc64 arm-h3600 ia64-bigsur mips-pnx8550-jbs powerpc-prpmc2800 arm-h7201 ia64-defconfig mips-pnx8550-stb810 powerpc-ps3 arm-h7202 ia64-gensparse mips-qemu powerpc-pseries arm-hackkit ia64-sim mips-rbhma4200 powerpc-up arm-integrator ia64-sn2 mips-rbhma4500 s390 arm-iop13xx ia64-tiger mips-rm200 s390-allnoconfig arm-iop32x ia64-up mips-sb1250-swarm s390-defconfig arm-iop33x ia64-zx1 mips-sead s390-up arm-ixp2000 m68k mips-tb0219 sparc arm-ixp23xx m68k-amiga mips-tb0226 sparc-allnoconfig arm-ixp4xx m68k-apollo mips-tb0287 sparc-defconfig arm-jornada720 m68k-atari mips-workpad sparc-up arm-kafa m68k-bvme6000 mips-wrppmc sparc64 arm-kb9202 m68k-hp300 mips-yosemite sparc64-allnoconfig arm-ks8695 m68k-mac parisc sparc64-defconfig arm-lart m68k-mvme147 parisc-allnoconfig sparc64-up arm-lpd270 m68k-mvme16x parisc-defconfig um-x86_64 arm-lpd7a400 m68k-q40 parisc-up x86_64 arm-lpd7a404 m68k-sun3 powerpc x86_64-allnoconfig arm-lubbock m68k-sun3x powerpc-cell x86_64-defconfig arm-lusl7200 mips powerpc-celleb x86_64-up arm-mainstone mips-atlas powerpc-chrp32 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
141 lines
3.3 KiB
C
141 lines
3.3 KiB
C
/*
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* Set up the VMAs to tell the VM about the vDSO.
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* Copyright 2007 Andi Kleen, SUSE Labs.
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* Subject to the GPL, v.2
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*/
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#include <linux/mm.h>
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#include <linux/err.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/random.h>
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#include <asm/vsyscall.h>
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#include <asm/vgtod.h>
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#include <asm/proto.h>
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#include "voffset.h"
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int vdso_enabled = 1;
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#define VEXTERN(x) extern typeof(__ ## x) *vdso_ ## x;
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#include "vextern.h"
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#undef VEXTERN
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extern char vdso_kernel_start[], vdso_start[], vdso_end[];
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extern unsigned short vdso_sync_cpuid;
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struct page **vdso_pages;
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static inline void *var_ref(void *vbase, char *var, char *name)
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{
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unsigned offset = var - &vdso_kernel_start[0] + VDSO_TEXT_OFFSET;
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void *p = vbase + offset;
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if (*(void **)p != (void *)VMAGIC) {
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printk("VDSO: variable %s broken\n", name);
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vdso_enabled = 0;
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}
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return p;
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}
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static int __init init_vdso_vars(void)
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{
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int npages = (vdso_end - vdso_start + PAGE_SIZE - 1) / PAGE_SIZE;
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int i;
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char *vbase;
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vdso_pages = kmalloc(sizeof(struct page *) * npages, GFP_KERNEL);
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if (!vdso_pages)
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goto oom;
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for (i = 0; i < npages; i++) {
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struct page *p;
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p = alloc_page(GFP_KERNEL);
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if (!p)
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goto oom;
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vdso_pages[i] = p;
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copy_page(page_address(p), vdso_start + i*PAGE_SIZE);
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}
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vbase = vmap(vdso_pages, npages, 0, PAGE_KERNEL);
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if (!vbase)
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goto oom;
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if (memcmp(vbase, "\177ELF", 4)) {
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printk("VDSO: I'm broken; not ELF\n");
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vdso_enabled = 0;
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}
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#define V(x) *(typeof(x) *) var_ref(vbase, (char *)RELOC_HIDE(&x, 0), #x)
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#define VEXTERN(x) \
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V(vdso_ ## x) = &__ ## x;
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#include "vextern.h"
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#undef VEXTERN
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return 0;
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oom:
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printk("Cannot allocate vdso\n");
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vdso_enabled = 0;
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return -ENOMEM;
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}
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__initcall(init_vdso_vars);
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struct linux_binprm;
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/* Put the vdso above the (randomized) stack with another randomized offset.
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This way there is no hole in the middle of address space.
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To save memory make sure it is still in the same PTE as the stack top.
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This doesn't give that many random bits */
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static unsigned long vdso_addr(unsigned long start, unsigned len)
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{
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unsigned long addr, end;
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unsigned offset;
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end = (start + PMD_SIZE - 1) & PMD_MASK;
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if (end >= TASK_SIZE64)
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end = TASK_SIZE64;
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end -= len;
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/* This loses some more bits than a modulo, but is cheaper */
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offset = get_random_int() & (PTRS_PER_PTE - 1);
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addr = start + (offset << PAGE_SHIFT);
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if (addr >= end)
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addr = end;
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return addr;
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}
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/* Setup a VMA at program startup for the vsyscall page.
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Not called for compat tasks */
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int arch_setup_additional_pages(struct linux_binprm *bprm, int exstack)
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{
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struct mm_struct *mm = current->mm;
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unsigned long addr;
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int ret;
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unsigned len = round_up(vdso_end - vdso_start, PAGE_SIZE);
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if (!vdso_enabled)
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return 0;
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down_write(&mm->mmap_sem);
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addr = vdso_addr(mm->start_stack, len);
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addr = get_unmapped_area(NULL, addr, len, 0, 0);
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if (IS_ERR_VALUE(addr)) {
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ret = addr;
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goto up_fail;
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}
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ret = install_special_mapping(mm, addr, len,
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VM_READ|VM_EXEC|
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VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
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VM_ALWAYSDUMP,
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vdso_pages);
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if (ret)
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goto up_fail;
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current->mm->context.vdso = (void *)addr;
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up_fail:
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up_write(&mm->mmap_sem);
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return ret;
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}
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static __init int vdso_setup(char *s)
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{
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vdso_enabled = simple_strtoul(s, NULL, 0);
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return 0;
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}
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__setup("vdso=", vdso_setup);
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