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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
192 lines
4.3 KiB
C
192 lines
4.3 KiB
C
/*
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* arch/alpha/boot/main.c
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*
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* Copyright (C) 1994, 1995 Linus Torvalds
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*
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* This file is the bootloader for the Linux/AXP kernel
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <generated/utsrelease.h>
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#include <linux/mm.h>
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#include <asm/system.h>
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#include <asm/console.h>
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#include <asm/hwrpb.h>
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#include <asm/pgtable.h>
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#include <stdarg.h>
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#include "ksize.h"
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extern int vsprintf(char *, const char *, va_list);
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extern unsigned long switch_to_osf_pal(unsigned long nr,
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struct pcb_struct * pcb_va, struct pcb_struct * pcb_pa,
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unsigned long *vptb);
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struct hwrpb_struct *hwrpb = INIT_HWRPB;
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static struct pcb_struct pcb_va[1];
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/*
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* Find a physical address of a virtual object..
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*
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* This is easy using the virtual page table address.
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*/
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static inline void *
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find_pa(unsigned long *vptb, void *ptr)
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{
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unsigned long address = (unsigned long) ptr;
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unsigned long result;
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result = vptb[address >> 13];
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result >>= 32;
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result <<= 13;
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result |= address & 0x1fff;
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return (void *) result;
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}
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/*
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* This function moves into OSF/1 pal-code, and has a temporary
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* PCB for that. The kernel proper should replace this PCB with
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* the real one as soon as possible.
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*
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* The page table muckery in here depends on the fact that the boot
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* code has the L1 page table identity-map itself in the second PTE
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* in the L1 page table. Thus the L1-page is virtually addressable
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* itself (through three levels) at virtual address 0x200802000.
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*/
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#define VPTB ((unsigned long *) 0x200000000)
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#define L1 ((unsigned long *) 0x200802000)
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void
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pal_init(void)
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{
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unsigned long i, rev;
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struct percpu_struct * percpu;
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struct pcb_struct * pcb_pa;
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/* Create the dummy PCB. */
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pcb_va->ksp = 0;
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pcb_va->usp = 0;
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pcb_va->ptbr = L1[1] >> 32;
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pcb_va->asn = 0;
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pcb_va->pcc = 0;
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pcb_va->unique = 0;
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pcb_va->flags = 1;
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pcb_va->res1 = 0;
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pcb_va->res2 = 0;
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pcb_pa = find_pa(VPTB, pcb_va);
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/*
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* a0 = 2 (OSF)
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* a1 = return address, but we give the asm the vaddr of the PCB
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* a2 = physical addr of PCB
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* a3 = new virtual page table pointer
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* a4 = KSP (but the asm sets it)
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*/
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srm_printk("Switching to OSF PAL-code .. ");
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i = switch_to_osf_pal(2, pcb_va, pcb_pa, VPTB);
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if (i) {
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srm_printk("failed, code %ld\n", i);
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__halt();
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}
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percpu = (struct percpu_struct *)
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(INIT_HWRPB->processor_offset + (unsigned long) INIT_HWRPB);
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rev = percpu->pal_revision = percpu->palcode_avail[2];
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srm_printk("Ok (rev %lx)\n", rev);
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tbia(); /* do it directly in case we are SMP */
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}
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static inline long openboot(void)
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{
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char bootdev[256];
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long result;
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result = callback_getenv(ENV_BOOTED_DEV, bootdev, 255);
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if (result < 0)
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return result;
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return callback_open(bootdev, result & 255);
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}
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static inline long close(long dev)
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{
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return callback_close(dev);
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}
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static inline long load(long dev, unsigned long addr, unsigned long count)
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{
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char bootfile[256];
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extern char _end;
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long result, boot_size = &_end - (char *) BOOT_ADDR;
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result = callback_getenv(ENV_BOOTED_FILE, bootfile, 255);
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if (result < 0)
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return result;
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result &= 255;
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bootfile[result] = '\0';
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if (result)
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srm_printk("Boot file specification (%s) not implemented\n",
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bootfile);
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return callback_read(dev, count, (void *)addr, boot_size/512 + 1);
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}
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/*
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* Start the kernel.
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*/
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static void runkernel(void)
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{
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__asm__ __volatile__(
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"bis %1,%1,$30\n\t"
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"bis %0,%0,$26\n\t"
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"ret ($26)"
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: /* no outputs: it doesn't even return */
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: "r" (START_ADDR),
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"r" (PAGE_SIZE + INIT_STACK));
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}
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void start_kernel(void)
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{
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long i;
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long dev;
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int nbytes;
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char envval[256];
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srm_printk("Linux/AXP bootloader for Linux " UTS_RELEASE "\n");
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if (INIT_HWRPB->pagesize != 8192) {
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srm_printk("Expected 8kB pages, got %ldkB\n", INIT_HWRPB->pagesize >> 10);
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return;
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}
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pal_init();
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dev = openboot();
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if (dev < 0) {
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srm_printk("Unable to open boot device: %016lx\n", dev);
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return;
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}
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dev &= 0xffffffff;
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srm_printk("Loading vmlinux ...");
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i = load(dev, START_ADDR, KERNEL_SIZE);
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close(dev);
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if (i != KERNEL_SIZE) {
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srm_printk("Failed (%lx)\n", i);
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return;
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}
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nbytes = callback_getenv(ENV_BOOTED_OSFLAGS, envval, sizeof(envval));
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if (nbytes < 0) {
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nbytes = 0;
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}
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envval[nbytes] = '\0';
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strcpy((char*)ZERO_PGE, envval);
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srm_printk(" Ok\nNow booting the kernel\n");
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runkernel();
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for (i = 0 ; i < 0x100000000 ; i++)
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/* nothing */;
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__halt();
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}
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